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</div> </a> <button aria-controls="toc-Types-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Types subsection</span> </button> <ul id="toc-Types-sublist" class="vector-toc-list"> <li id="toc-Clay_plaster" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Clay_plaster"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.1</span> <span>Clay plaster</span> </div> </a> <ul id="toc-Clay_plaster-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Gypsum_plaster_(plaster_of_Paris)" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Gypsum_plaster_(plaster_of_Paris)"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2</span> <span>Gypsum plaster (plaster of Paris)</span> </div> </a> <ul id="toc-Gypsum_plaster_(plaster_of_Paris)-sublist" class="vector-toc-list"> <li id="toc-Etymology" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Etymology"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2.1</span> <span>Etymology</span> </div> </a> <ul id="toc-Etymology-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Chemistry" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Chemistry"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2.2</span> <span>Chemistry</span> </div> </a> <ul id="toc-Chemistry-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Uses_of_gypsum_plaster" class="vector-toc-list-item vector-toc-level-3"> <a class="vector-toc-link" href="#Uses_of_gypsum_plaster"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.2.3</span> <span>Uses of gypsum plaster</span> </div> </a> <ul id="toc-Uses_of_gypsum_plaster-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Lime_plaster" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Lime_plaster"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.3</span> <span>Lime plaster</span> </div> </a> <ul id="toc-Lime_plaster-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Cement_plaster" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Cement_plaster"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.4</span> <span>Cement plaster</span> </div> </a> <ul id="toc-Cement_plaster-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Heat-resistant_plaster" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Heat-resistant_plaster"> <div class="vector-toc-text"> <span class="vector-toc-numb">2.5</span> <span>Heat-resistant plaster</span> </div> </a> <ul id="toc-Heat-resistant_plaster-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Applications" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Applications"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Applications</span> </div> </a> <button aria-controls="toc-Applications-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Applications subsection</span> </button> <ul id="toc-Applications-sublist" class="vector-toc-list"> <li id="toc-In_decorative_architecture" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#In_decorative_architecture"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>In decorative architecture</span> </div> </a> <ul id="toc-In_decorative_architecture-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Art" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Art"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.2</span> <span>Art</span> </div> </a> <ul id="toc-Art-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Medicine" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Medicine"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.3</span> <span>Medicine</span> </div> </a> <ul id="toc-Medicine-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Fire_protection" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Fire_protection"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.4</span> <span>Fire protection</span> </div> </a> <ul id="toc-Fire_protection-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-3D_printing" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#3D_printing"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.5</span> <span>3D printing</span> </div> </a> <ul id="toc-3D_printing-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Gallery" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Gallery"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.6</span> <span>Gallery</span> </div> </a> <ul id="toc-Gallery-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Safety_issues" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Safety_issues"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Safety issues</span> </div> </a> <ul id="toc-Safety_issues-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-See_also" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#See_also"> <div class="vector-toc-text"> <span class="vector-toc-numb">5</span> <span>See also</span> </div> </a> <ul id="toc-See_also-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-References" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#References"> <div class="vector-toc-text"> <span class="vector-toc-numb">6</span> <span>References</span> </div> </a> <ul id="toc-References-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-External_links" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#External_links"> <div class="vector-toc-text"> <span class="vector-toc-numb">7</span> <span>External links</span> </div> </a> <ul id="toc-External_links-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" title="Table of Contents" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Plaster</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 52 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-52" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">52 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ar mw-list-item"><a href="https://ar.wikipedia.org/wiki/%D9%82%D8%B5%D8%A7%D8%B1%D8%A9" title="قصارة – Arabic" lang="ar" hreflang="ar" data-title="قصارة" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-an mw-list-item"><a href="https://an.wikipedia.org/wiki/Cheso_(material)" title="Cheso (material) – Aragonese" lang="an" hreflang="an" data-title="Cheso (material)" data-language-autonym="Aragonés" data-language-local-name="Aragonese" class="interlanguage-link-target"><span>Aragonés</span></a></li><li class="interlanguage-link interwiki-be mw-list-item"><a href="https://be.wikipedia.org/wiki/%D0%A2%D1%8B%D0%BD%D0%BA%D0%BE%D1%9E%D0%BA%D0%B0" title="Тынкоўка – Belarusian" lang="be" hreflang="be" data-title="Тынкоўка" data-language-autonym="Беларуская" data-language-local-name="Belarusian" class="interlanguage-link-target"><span>Беларуская</span></a></li><li class="interlanguage-link interwiki-be-x-old mw-list-item"><a href="https://be-tarask.wikipedia.org/wiki/%D0%A2%D1%8B%D0%BD%D0%BA%D0%BE%D1%9E%D0%BA%D0%B0" title="Тынкоўка – Belarusian (Taraškievica orthography)" lang="be-tarask" hreflang="be-tarask" data-title="Тынкоўка" data-language-autonym="Беларуская (тарашкевіца)" data-language-local-name="Belarusian (Taraškievica orthography)" class="interlanguage-link-target"><span>Беларуская (тарашкевіца)</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/%D0%9C%D0%B0%D0%B7%D0%B8%D0%BB%D0%BA%D0%B0" title="Мазилка – Bulgarian" lang="bg" hreflang="bg" data-title="Мазилка" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/Guix_(construcci%C3%B3)" title="Guix (construcció) – Catalan" lang="ca" hreflang="ca" data-title="Guix (construcció)" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Om%C3%ADtka" title="Omítka – Czech" lang="cs" hreflang="cs" data-title="Omítka" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Putz_(Bauteil)" title="Putz (Bauteil) – German" lang="de" hreflang="de" data-title="Putz (Bauteil)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-et mw-list-item"><a href="https://et.wikipedia.org/wiki/Krohv" title="Krohv – Estonian" lang="et" hreflang="et" data-title="Krohv" data-language-autonym="Eesti" data-language-local-name="Estonian" class="interlanguage-link-target"><span>Eesti</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/%CE%93%CF%8D%CF%88%CE%BF%CF%82_(%CE%BF%CE%B9%CE%BA%CE%BF%CE%B4%CE%BF%CE%BC%CE%B9%CE%BA%CF%8C_%CF%85%CE%BB%CE%B9%CE%BA%CF%8C)" title="Γύψος (οικοδομικό υλικό) – Greek" lang="el" hreflang="el" data-title="Γύψος (οικοδομικό υλικό)" data-language-autonym="Ελληνικά" data-language-local-name="Greek" class="interlanguage-link-target"><span>Ελληνικά</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Yeso" title="Yeso – Spanish" lang="es" hreflang="es" data-title="Yeso" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-eo mw-list-item"><a href="https://eo.wikipedia.org/wiki/Gipso" title="Gipso – Esperanto" lang="eo" hreflang="eo" data-title="Gipso" data-language-autonym="Esperanto" data-language-local-name="Esperanto" class="interlanguage-link-target"><span>Esperanto</span></a></li><li class="interlanguage-link interwiki-eu mw-list-item"><a href="https://eu.wikipedia.org/wiki/Igeltsu_(materiala)" title="Igeltsu (materiala) – Basque" lang="eu" hreflang="eu" data-title="Igeltsu (materiala)" data-language-autonym="Euskara" data-language-local-name="Basque" class="interlanguage-link-target"><span>Euskara</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%DA%AF%DA%86" title="گچ – Persian" lang="fa" hreflang="fa" data-title="گچ" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Pl%C3%A2tre" title="Plâtre – French" lang="fr" hreflang="fr" data-title="Plâtre" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/Xeso_(construci%C3%B3n)" title="Xeso (construción) – Galician" lang="gl" hreflang="gl" data-title="Xeso (construción)" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-gu mw-list-item"><a href="https://gu.wikipedia.org/wiki/%E0%AA%AA%E0%AB%8D%E0%AA%B2%E0%AA%BE%E0%AA%B8%E0%AB%8D%E0%AA%9F%E0%AA%B0_%E0%AA%93%E0%AA%AB_%E0%AA%AA%E0%AB%87%E0%AA%B0%E0%AB%80%E0%AA%B8" title="પ્લાસ્ટર ઓફ પેરીસ – Gujarati" lang="gu" hreflang="gu" data-title="પ્લાસ્ટર ઓફ પેરીસ" data-language-autonym="ગુજરાતી" data-language-local-name="Gujarati" class="interlanguage-link-target"><span>ગુજરાતી</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%ED%94%8C%EB%9D%BC%EC%8A%A4%ED%84%B0" title="플라스터 – Korean" lang="ko" hreflang="ko" data-title="플라스터" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hi mw-list-item"><a href="https://hi.wikipedia.org/wiki/%E0%A4%AA%E0%A5%8D%E0%A4%B2%E0%A4%BE%E0%A4%B8%E0%A5%8D%E0%A4%9F%E0%A4%B0" title="प्लास्टर – Hindi" lang="hi" hreflang="hi" data-title="प्लास्टर" data-language-autonym="हिन्दी" data-language-local-name="Hindi" class="interlanguage-link-target"><span>हिन्दी</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/%C5%BDbuka" title="Žbuka – Croatian" lang="hr" hreflang="hr" data-title="Žbuka" data-language-autonym="Hrvatski" data-language-local-name="Croatian" class="interlanguage-link-target"><span>Hrvatski</span></a></li><li class="interlanguage-link interwiki-id mw-list-item"><a href="https://id.wikipedia.org/wiki/Turap" title="Turap – Indonesian" lang="id" hreflang="id" data-title="Turap" data-language-autonym="Bahasa Indonesia" data-language-local-name="Indonesian" class="interlanguage-link-target"><span>Bahasa Indonesia</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Gesso_(materiale)" title="Gesso (materiale) – Italian" lang="it" hreflang="it" data-title="Gesso (materiale)" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-he mw-list-item"><a href="https://he.wikipedia.org/wiki/%D7%98%D7%99%D7%97" title="טיח – Hebrew" lang="he" hreflang="he" data-title="טיח" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ku mw-list-item"><a href="https://ku.wikipedia.org/wiki/%C5%9E%C3%AAl" title="Şêl – Kurdish" lang="ku" hreflang="ku" data-title="Şêl" data-language-autonym="Kurdî" data-language-local-name="Kurdish" class="interlanguage-link-target"><span>Kurdî</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/Tinkas" title="Tinkas – Lithuanian" lang="lt" hreflang="lt" data-title="Tinkas" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-lmo mw-list-item"><a href="https://lmo.wikipedia.org/wiki/Stabilidura" title="Stabilidura – Lombard" lang="lmo" hreflang="lmo" data-title="Stabilidura" data-language-autonym="Lombard" data-language-local-name="Lombard" class="interlanguage-link-target"><span>Lombard</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/Vakolat" title="Vakolat – Hungarian" lang="hu" hreflang="hu" data-title="Vakolat" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/Plaster" title="Plaster – Malay" lang="ms" hreflang="ms" data-title="Plaster" data-language-autonym="Bahasa Melayu" data-language-local-name="Malay" class="interlanguage-link-target"><span>Bahasa Melayu</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Pleister_(bouw)" title="Pleister (bouw) – Dutch" lang="nl" hreflang="nl" data-title="Pleister (bouw)" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/%E6%BC%86%E5%96%B0" title="漆喰 – Japanese" lang="ja" hreflang="ja" data-title="漆喰" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-nap mw-list-item"><a href="https://nap.wikipedia.org/wiki/Ntuonaco" title="Ntuonaco – Neapolitan" lang="nap" hreflang="nap" data-title="Ntuonaco" data-language-autonym="Napulitano" data-language-local-name="Neapolitan" class="interlanguage-link-target"><span>Napulitano</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Murpuss" title="Murpuss – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Murpuss" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/G%C5%82ad%C5%BA_szpachlowa" title="Gładź szpachlowa – Polish" lang="pl" hreflang="pl" data-title="Gładź szpachlowa" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Gesso" title="Gesso – Portuguese" lang="pt" hreflang="pt" data-title="Gesso" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ro mw-list-item"><a href="https://ro.wikipedia.org/wiki/Ipsos" title="Ipsos – Romanian" lang="ro" hreflang="ro" data-title="Ipsos" data-language-autonym="Română" data-language-local-name="Romanian" class="interlanguage-link-target"><span>Română</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/%D0%A8%D1%82%D1%83%D0%BA%D0%B0%D1%82%D1%83%D1%80%D0%BA%D0%B0" title="Штукатурка – Russian" lang="ru" hreflang="ru" data-title="Штукатурка" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sq mw-list-item"><a href="https://sq.wikipedia.org/wiki/Suva_(arkitektur%C3%AB)" title="Suva (arkitekturë) – Albanian" lang="sq" hreflang="sq" data-title="Suva (arkitekturë)" 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<div class="vector-body-before-content"> <div class="mw-indicators"> </div> <div id="siteSub" class="noprint">From Wikipedia, the free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Broad range of building and sculpture materials</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about the type of building material and "plaster of Paris". For other uses, see <a href="/wiki/Plaster_(disambiguation)" class="mw-disambig" title="Plaster (disambiguation)">Plaster (disambiguation)</a>.</div> <p class="mw-empty-elt"> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Fontainebleau_escalier_roi5.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Fontainebleau_escalier_roi5.jpg/220px-Fontainebleau_escalier_roi5.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Fontainebleau_escalier_roi5.jpg/330px-Fontainebleau_escalier_roi5.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d3/Fontainebleau_escalier_roi5.jpg/440px-Fontainebleau_escalier_roi5.jpg 2x" data-file-width="1024" data-file-height="768" /></a><figcaption><a href="/wiki/Stucco" title="Stucco">Stucco</a> plaster <a href="/wiki/Relief" title="Relief">reliefs</a>, such as this work at the <a href="/wiki/Ch%C3%A2teau_de_Fontainebleau" class="mw-redirect" title="Château de Fontainebleau">Château de Fontainebleau</a>, were hugely influential in <a href="/wiki/Northern_Mannerism" title="Northern Mannerism">Northern Mannerism</a>. A plaster low-relief decorative <a href="/wiki/Frieze" title="Frieze">frieze</a> is above it.</figcaption></figure> <p><b>Plaster</b> is a <a href="/wiki/Building_material" title="Building material">building material</a> used for the protective or decorative coating of walls and ceilings and for <a href="/wiki/Molding_(decorative)" title="Molding (decorative)">moulding</a> and casting decorative elements.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> In English, "plaster" usually means a material used for the interiors of buildings, while "render" commonly refers to external applications.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> The term <a href="/wiki/Stucco" title="Stucco">stucco</a> refers to <a href="/wiki/Plasterwork" title="Plasterwork">plasterwork</a> that is worked in some way to produce <a href="/wiki/Relief" title="Relief">relief</a> decoration, rather than flat surfaces. </p><p>The most common types of plaster mainly contain either <a href="/wiki/Gypsum" title="Gypsum">gypsum</a>, <a href="/wiki/Lime_plaster" title="Lime plaster">lime</a>, or <a href="/wiki/Cement_plaster" class="mw-redirect" title="Cement plaster">cement</a>,<sup id="cite_ref-Ullmanns_3-0" class="reference"><a href="#cite_note-Ullmanns-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> but all work in a similar way. The plaster is manufactured as a dry powder and is mixed with water to form a stiff but workable paste immediately before it is applied to the surface. The reaction with water liberates heat through <a href="/wiki/Crystallization" title="Crystallization">crystallization</a> and the hydrated plaster then hardens. </p><p>Plaster can be relatively easily worked with metal tools and <a href="/wiki/Sandpaper" title="Sandpaper">sandpaper</a> and can be moulded, either on site or in advance, and worked pieces can be put in place with <a href="/wiki/Adhesive" title="Adhesive">adhesive</a>. Plaster is suitable for finishing rather than load-bearing, and when thickly applied for decoration may require a hidden supporting framework. </p><p>Forms of plaster have several other uses. In medicine, plaster <a href="/wiki/Orthopedic_cast" title="Orthopedic cast">orthopedic casts</a> are still often used for supporting set broken bones. In dentistry, plaster is used to make dental models by pouring the material into <a href="/wiki/Dental_impression" title="Dental impression">dental impressions</a>. Various types of models and moulds are made with plaster. In art, lime plaster is the traditional matrix for <a href="/wiki/Fresco" title="Fresco">fresco</a> painting; the pigments are applied to a thin wet top layer of plaster and fuse with it so that the painting is actually in coloured plaster. In the ancient world, as well as the sort of ornamental designs in plaster relief that are still used, plaster was also widely used to create large figurative reliefs for walls, though few of these have survived. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-Unreferenced_section plainlinks metadata ambox ambox-content ambox-Unreferenced" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section <b>does not <a href="/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources">cite</a> any <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">sources</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Plaster" title="Special:EditPage/Plaster">improve this section</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and <a href="/wiki/Wikipedia:Verifiability#Burden_of_evidence" title="Wikipedia:Verifiability">removed</a>.</span> <span class="date-container"><i>(<span class="date">July 2023</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <p>Plaster was first used as a building material and for decoration in the <a href="/wiki/Middle_East" title="Middle East">Middle East</a> at least 7,000 years ago. In Egypt, <a href="/wiki/Gypsum" title="Gypsum">gypsum</a> was burned in open fires, crushed into powder, and mixed with water to create plaster, used as a <a href="/wiki/Mortar_(masonry)" title="Mortar (masonry)">mortar</a> between the blocks of pyramids and to provide a smooth wall facing. In Jericho, a cult arose where <a href="/wiki/Plastered_human_skulls" title="Plastered human skulls">human skulls were decorated with plaster</a> and painted to appear lifelike. The <a href="/wiki/Ancient_Rome" title="Ancient Rome">Romans</a> brought plaster-work techniques to <a href="/wiki/Europe" title="Europe">Europe</a>. </p> <div class="mw-heading mw-heading2"><h2 id="Types">Types</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=2" title="Edit section: Types"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="Clay_plaster">Clay plaster</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=3" title="Edit section: Clay plaster"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Earthen_plaster" title="Earthen plaster">Earthen plaster</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Mud_plaster_over_straw_bales_wall.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Mud_plaster_over_straw_bales_wall.jpg/220px-Mud_plaster_over_straw_bales_wall.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Mud_plaster_over_straw_bales_wall.jpg/330px-Mud_plaster_over_straw_bales_wall.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/3b/Mud_plaster_over_straw_bales_wall.jpg/440px-Mud_plaster_over_straw_bales_wall.jpg 2x" data-file-width="1000" data-file-height="750" /></a><figcaption>Applying mud plaster to an outside wall</figcaption></figure> <p>Clay plaster is a mixture of <a href="/wiki/Clay" title="Clay">clay</a>, sand and water often with the addition of plant fibers for tensile strength over wood <a href="/wiki/Lath" title="Lath">lath</a>. </p><p>Clay plaster has been used around the world at least since antiquity. Settlers in the American colonies used clay plaster on the interiors of their houses: "Interior plastering in the form of clay antedated even the building of houses of frame, and must have been visible in the inside of <a href="/wiki/Wattle_(construction)" title="Wattle (construction)">wattle</a> filling in those earliest frame houses in which … <a href="/wiki/Wainscot" class="mw-redirect" title="Wainscot">wainscot</a> had not been indulged. Clay continued in use long after the adoption of laths and brick filling for the frame."<sup id="cite_ref-McKee_4-0" class="reference"><a href="#cite_note-McKee-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> Where lime was not easily accessible it was rationed and usually substituted with clay as a binder. In <a href="/wiki/Martin_E._Weaver" title="Martin E. Weaver">Martin E. Weaver</a>'s seminal work he says, "Mud plaster consists of clay or earth which is mixed with water to give a 'plastic' or workable consistency. If the clay mixture is too plastic it will shrink, crack and distort on drying. Sand, fine gravels and fibres were added to reduce the concentrations of fine clay particles which were the cause of the excessive shrinkage."<sup id="cite_ref-conserving_5-0" class="reference"><a href="#cite_note-conserving-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Manure was often added for its fibre content. In some building techniques straw or grass was used as reinforcement. </p><p>In the Earliest European settlers' plasterwork, a mud plaster was used<sup id="cite_ref-conserving_5-1" class="reference"><a href="#cite_note-conserving-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> McKee <sup id="cite_ref-McKee_4-1" class="reference"><a href="#cite_note-McKee-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> wrote, of a circa 1675 Massachusetts contract that specified the plasterer, "Is to lath and siele<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> the four rooms of the house betwixt the joists overhead with a coat of lime and haire upon the clay; also to fill the gable ends of the house with ricks and plaister them with clay. 5. To lath and plaster partitions of the house with clay and lime, and to fill, lath, and plaister them with lime and haire besides; and to siele and lath them overhead with lime; also to fill, lath, and plaster the kitchen up to the wall plate on every side. 6. The said Daniel Andrews is to find lime, bricks, clay, stone, haire, together with laborers and workmen."<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> Records of the New Haven colony in 1641 mention clay and hay as well as lime and hair also. In German houses of Pennsylvania the use of clay persisted.<sup id="cite_ref-8" class="reference"><a href="#cite_note-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup> </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Clay_plaster_ceiling.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Clay_plaster_ceiling.jpg/220px-Clay_plaster_ceiling.jpg" decoding="async" width="220" height="164" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Clay_plaster_ceiling.jpg/330px-Clay_plaster_ceiling.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/b8/Clay_plaster_ceiling.jpg/440px-Clay_plaster_ceiling.jpg 2x" data-file-width="2592" data-file-height="1936" /></a><figcaption>Clay plaster base coat on split oak lath held in place with straw and manure, covered with a lime plaster top coat, <a href="/wiki/Old_Economy_Village" title="Old Economy Village">Old Economy Village</a>, Pennsylvania (1827)</figcaption></figure> <p><a href="/wiki/Old_Economy_Village" title="Old Economy Village">Old Economy Village</a> is one such German settlement. The early Nineteenth-Century utopian village in present-day <a href="/wiki/Ambridge,_Pennsylvania" title="Ambridge, Pennsylvania">Ambridge</a>, Pennsylvania, used clay plaster substrate exclusively in the brick and wood frame high architecture of the Feast Hall, Great House and other large and commercial structures as well as in the brick, frame and log dwellings of the society members. The use of clay in plaster and in laying brickwork appears to have been a common practice at that time not just in the construction of Economy village when the settlement was founded in 1824. Specifications for the construction of, "Lock keepers houses on the <a href="/wiki/Chesapeake_and_Ohio_Canal_National_Historical_Park" title="Chesapeake and Ohio Canal National Historical Park">Chesapeake</a> and Ohio Canal, written about 1828, require stone walls to be laid with clay mortar, excepting 3 inches on the outside of the walls … which (are) to be good lime mortar and well pointed."<sup id="cite_ref-9" class="reference"><a href="#cite_note-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup> The choice of clay was because of its low cost, but also the availability. At Economy, <a href="/wiki/Root_cellar" title="Root cellar">root cellars</a> dug under the houses yielded clay and sand (stone), or the nearby Ohio river yielded washed sand from the <a href="/wiki/Shoal" title="Shoal">sand</a> bars; and lime outcroppings and oyster shell for the <a href="/wiki/Lime_kiln" title="Lime kiln">lime kiln</a>. </p><p>The surrounding forests of the new village of Economy provided straight grain, old-<a href="/wiki/Old-growth_forest" title="Old-growth forest">growth</a> oak trees for lath.<sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> Hand split lath starts with a log of straight grained wood of the required length. The log is split into quarters and then smaller and smaller bolts with wedges and a sledge. When small enough, a froe and mallet were used to split away narrow strips of lath. Farm animals provided hair and manure for the float coat of plaster. Fields of wheat and grains provided straw and hay to reinforce the clay plaster. But there was no uniformity in clay plaster recipes. </p><p><a href="/wiki/Manure" title="Manure">Manure</a> provides fiber for tensile strength as well as protein adhesive. Unlike <a href="/wiki/Casein" title="Casein">casein</a> used with lime plaster, hydrogen bonds of manure proteins are weakened by moisture.<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> With braced timber-framed structures clay plaster was used on interior walls and ceilings as well as exterior walls as the wall cavity and exterior cladding isolated the clay plaster from moisture penetration. Application of clay plaster in brick structures risked water penetration from failed mortar joints on the exterior brick walls. In Economy Village, the rear and middle wythes of brick dwelling walls are laid in a clay and sand mortar with the front wythe bedded in a lime and sand mortar to provide a weather proof seal to protect from water penetration. This allowed a rendering of clay plaster and setting coat of thin lime and fine sand on exterior-walled rooms. </p> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Clay,_straw_lime_on_wall_lath_closeup.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Clay%2C_straw_lime_on_wall_lath_closeup.jpg/220px-Clay%2C_straw_lime_on_wall_lath_closeup.jpg" decoding="async" width="220" height="164" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Clay%2C_straw_lime_on_wall_lath_closeup.jpg/330px-Clay%2C_straw_lime_on_wall_lath_closeup.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8a/Clay%2C_straw_lime_on_wall_lath_closeup.jpg/440px-Clay%2C_straw_lime_on_wall_lath_closeup.jpg 2x" data-file-width="2592" data-file-height="1936" /></a><figcaption>Lime setting-coat on clay plaster with straw binder. Applied to hand-split lath over a timber framed wall of a brick family house at Old Economy Village, Pennsylvania</figcaption></figure> <p>Split lath was nailed with square cut lath nails, one into each framing member. With hand split lath the plasterer had the luxury of making lath to fit the cavity being plastered. Lengths of lath two to six foot are not uncommon at Economy Village. Hand split lath is not uniform like sawn lath. The straightness or waviness of the grain affected the thickness or width of each lath, and thus the spacing of the lath. The clay plaster rough coat varied to cover the irregular lath. Window and door trim as well as the mudboard (baseboard) acted as screeds. With the variation of the lath thickness and use of coarse straw and manure, the clay coat of plaster was thick in comparison to later lime-only and gypsum plasters. In Economy Village, the lime top coats are thin veneers often an eighth inch or less attesting to the scarcity of limestone supplies there. </p><p>Clay plasters with their lack of tensile and compressive strength fell out of favor as industrial mining and technology advances in kiln production led to the exclusive use of lime and then gypsum in plaster applications. However, clay plasters still exist after hundreds of years clinging to split lath on rusty square nails. The wall variations and roughness reveal a hand-made and pleasing textured alternative to machine-made modern substrate finishes. But clay plaster finishes are rare and fleeting. According to Martin Weaver, "Many of North America's historic building interiors … are all too often … one of the first things to disappear in the frenzy of demolition of interiors which has unfortunately come to be a common companion to 'heritage preservation' in the guise of building rehabilitation."<sup id="cite_ref-conserving_5-2" class="reference"><a href="#cite_note-conserving-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Gypsum_plaster_(plaster_of_Paris)"><span id="Gypsum_plaster_.28plaster_of_Paris.29"></span>Gypsum plaster (plaster of Paris)<span class="anchor" id="Gypsum_plaster"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=4" title="Edit section: Gypsum plaster (plaster of Paris)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Gypsum" title="Gypsum">Gypsum</a> plaster,<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> also known as <b>plaster of Paris</b>,<sup id="cite_ref-Britannica_13-0" class="reference"><a href="#cite_note-Britannica-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> is a white powder consisting of <a href="/wiki/Calcium_sulfate#Hydration_and_dehydration_reactions" title="Calcium sulfate">calcium sulfate hemihydrate</a>. The natural form of the compound is the mineral <a href="/wiki/Bassanite" title="Bassanite">bassanite</a>.<sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Etymology">Etymology</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=5" title="Edit section: Etymology"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at <a href="/wiki/Montmartre" title="Montmartre">Montmartre</a>, a hill in the north end of <a href="/wiki/Paris" title="Paris">Paris</a>.<sup id="cite_ref-Britannica_13-1" class="reference"><a href="#cite_note-Britannica-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-16" class="reference"><a href="#cite_note-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-17" class="reference"><a href="#cite_note-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Chemistry">Chemistry</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=6" title="Edit section: Chemistry"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Calcium_sulfate#Hydration_and_dehydration_reactions" title="Calcium sulfate">Calcium sulfate § Hydration and dehydration reactions</a></div> <p>Gypsum plaster, gypsum powder, or plaster of Paris, is produced by heating gypsum to about 120–180 °C (248–356 °F) in a kiln:<sup id="cite_ref-lafarge_18-0" class="reference"><a href="#cite_note-lafarge-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Britannica_13-2" class="reference"><a href="#cite_note-Britannica-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup> <span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {CaSO4.2H2O {\overset {heat}{{}->{}}}{CaSO4.1/2H2O}+ 1\!1/2 H2O ^}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <msubsup> <mtext>CaSO</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mo>⋅</mo> <mn>2</mn> <mspace width="thinmathspace" /> <msubsup> <mtext>H</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mtext>O</mtext> <mrow class="MJX-TeXAtom-ORD"> <mover> <mrow> <mrow class="MJX-TeXAtom-ORD"> </mrow> <mo stretchy="false">⟶</mo> <mrow class="MJX-TeXAtom-ORD"> </mrow> </mrow> <mtext>heat</mtext> </mover> </mrow> <mrow class="MJX-TeXAtom-ORD"> <msubsup> <mtext>CaSO</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mo>⋅</mo> <mstyle displaystyle="false" scriptlevel="0"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mstyle> <msubsup> <mtext>H</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mtext>O</mtext> </mrow> <mo>+</mo> <mn>1</mn> <mspace width="thinmathspace" /> <mspace width="negativethinmathspace" /> <mstyle displaystyle="false" scriptlevel="0"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mstyle> <msubsup> <mtext>H</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mtext>O</mtext> <mrow class="MJX-TeXAtom-ORD"> <mo stretchy="false">↑</mo> </mrow> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\ce {CaSO4.2H2O {\overset {heat}{{}->{}}}{CaSO4.1/2H2O}+ 1\!1/2 H2O ^}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/bd8d173f57197e8788e8a5a72c6a4dfdd41fc6f9" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.171ex; width:46.292ex; height:4.509ex;" alt="{\displaystyle {\ce {CaSO4.2H2O {\overset {heat}{{}->{}}}{CaSO4.1/2H2O}+ 1\!1/2 H2O ^}}}"></span> (released as steam). </p><p>Plaster of Paris has a remarkable property of setting into a hard mass on wetting with water. </p><p><span class="mwe-math-element"><span class="mwe-math-mathml-display mwe-math-mathml-a11y" style="display: none;"><math display="block" xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\ce {CaSO4.1/2H2O + 1 1/2H2O -> CaSO4.2H2O}}}"> <semantics> <mrow class="MJX-TeXAtom-ORD"> <mstyle displaystyle="true" scriptlevel="0"> <mrow class="MJX-TeXAtom-ORD"> <msubsup> <mtext>CaSO</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mo>⋅</mo> <mstyle displaystyle="false" scriptlevel="0"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mstyle> <msubsup> <mtext>H</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mtext>O</mtext> <mo>+</mo> <mn>1</mn> <mspace width="thinmathspace" /> <mstyle displaystyle="false" scriptlevel="0"> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mstyle> <msubsup> <mtext>H</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mtext>O</mtext> <mo stretchy="false">⟶</mo> <msubsup> <mtext>CaSO</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>4</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mo>⋅</mo> <mn>2</mn> <mspace width="thinmathspace" /> <msubsup> <mtext>H</mtext> <mrow class="MJX-TeXAtom-ORD"> <mn>2</mn> </mrow> <mrow class="MJX-TeXAtom-ORD"> <mspace width="0pt" height="0pt" depth=".2em" /> </mrow> </msubsup> <mtext>O</mtext> </mrow> </mstyle> </mrow> <annotation encoding="application/x-tex">{\displaystyle {\ce {CaSO4.1/2H2O + 1 1/2H2O -> CaSO4.2H2O}}}</annotation> </semantics> </math></span><img src="https://wikimedia.org/api/rest_v1/media/math/render/svg/3e5d4100b731aa3109791f7a11a826607ede4022" class="mwe-math-fallback-image-display mw-invert skin-invert" aria-hidden="true" style="vertical-align: -1.171ex; width:45.517ex; height:3.509ex;" alt="{\displaystyle {\ce {CaSO4.1/2H2O + 1 1/2H2O -> CaSO4.2H2O}}}"></span> </p><p>Plaster of Paris is stored in <a href="/wiki/Moisture" title="Moisture">moisture</a>-proof containers, because the presence of moisture can cause slow setting of plaster of Paris by bringing about its hydration, which will make it useless after some time.<sup id="cite_ref-Singh-2019_19-0" class="reference"><a href="#cite_note-Singh-2019-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> </p><p>When the dry plaster powder is mixed with water, it rehydrates over time into gypsum. The setting of plaster slurry starts about 10 minutes after mixing and is complete in about 45 minutes. The setting of plaster of Paris is accompanied by a slight expansion of volume. It is used in making casts for statues, <a href="/wiki/Toy" title="Toy">toys</a>, and more.<sup id="cite_ref-Singh-2019_19-1" class="reference"><a href="#cite_note-Singh-2019-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> The initial matrix consists mostly of orthorhombic crystals: the kinetic product. Over the next 72 hours, the rhombic crystals give way to an interlocking mass of monoclinic crystal needles, and the plaster increases in hardness and strength.<sup id="cite_ref-Schmidt_20-0" class="reference"><a href="#cite_note-Schmidt-20"><span class="cite-bracket">[</span>20<span class="cite-bracket">]</span></a></sup> If plaster or gypsum is heated to between 130 °C (266 °F) and 180 °C (350 °F), <a href="/wiki/Hemihydrate" title="Hemihydrate">hemihydrate</a> is formed, which will also re-form as gypsum if mixed with water.<sup id="cite_ref-21" class="reference"><a href="#cite_note-21"><span class="cite-bracket">[</span>21<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Posnjak_22-0" class="reference"><a href="#cite_note-Posnjak-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p><p>On heating to 180 °C (350 °F), the nearly water-free form, called γ-anhydrite (CaSO<sub>4</sub>·<i>n</i>H<sub>2</sub>O where <i>n</i> = 0 to 0.05) is produced. γ-anhydrite reacts slowly with water to return to the dihydrate state, a property exploited in some commercial <a href="/wiki/Desiccant" title="Desiccant">desiccants</a>. On heating above 250 °C (480 °F), the completely anhydrous form called β-anhydrite or dead burned plaster is formed.<sup id="cite_ref-Singh-2019_19-2" class="reference"><a href="#cite_note-Singh-2019-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Posnjak_22-1" class="reference"><a href="#cite_note-Posnjak-22"><span class="cite-bracket">[</span>22<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading4"><h4 id="Uses_of_gypsum_plaster">Uses of gypsum plaster</h4><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=7" title="Edit section: Uses of gypsum plaster"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Further information: <a class="mw-selflink-fragment" href="#Applications">Plaster § Applications</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Cast_extended.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Cast_extended.jpg/220px-Cast_extended.jpg" decoding="async" width="220" height="162" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Cast_extended.jpg/330px-Cast_extended.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/ae/Cast_extended.jpg/440px-Cast_extended.jpg 2x" data-file-width="4616" data-file-height="3400" /></a><figcaption>An <a href="/wiki/Orthopedic_cast" title="Orthopedic cast">orthopedic cast</a> for the hand made out of plaster.</figcaption></figure> <ul><li>for making surfaces like the walls of a house smooth before painting them and for making ornamental designs on the ceilings of houses and other buildings.<sup id="cite_ref-Singh-2019_19-3" class="reference"><a href="#cite_note-Singh-2019-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> <i>(see <a href="#In_decorative_architecture">Plaster In decorative architecture</a>)</i></li> <li>for making <a href="/wiki/Toy" title="Toy">toys</a>, decorative materials, cheap ornaments, <a href="/wiki/Cosmetics" title="Cosmetics">cosmetics</a>, and <a href="/wiki/Blackboard" title="Blackboard">black-board</a> <a href="/wiki/Chalk" title="Chalk">chalk</a>.<sup id="cite_ref-Singh-2019_19-4" class="reference"><a href="#cite_note-Singh-2019-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li> <li>a <a href="/wiki/Fireproofing" title="Fireproofing">fire-proofing</a> material.<sup id="cite_ref-Singh-2019_19-5" class="reference"><a href="#cite_note-Singh-2019-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> <i>(see <a href="#Fire_protection">Plaster in Fire protection</a>)</i></li> <li>an orthopedic cast is used in hospitals for setting <a href="/wiki/Bone_fracture" title="Bone fracture">fractured bones</a> in the right position to ensure correct healing and avoid <a href="/wiki/Nonunion" title="Nonunion">nonunion</a>. It keeps the fractured bone straight. It is used in this way, because when plaster of Paris is mixed with a proper quantity of water and applied around the fractured limb, it sets into a hard mass, thereby keeping the bones in a fixed position. It is also used for making casts in <a href="/wiki/Dentistry" title="Dentistry">dentistry</a>.<sup id="cite_ref-Singh-2019_19-6" class="reference"><a href="#cite_note-Singh-2019-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup> <i>(see <a href="#Medicine">Plaster in Medicine</a>)</i></li> <li><a href="/wiki/Laboratory" title="Laboratory">chemistry laboratory</a> for sealing air-gaps in apparatus when air-tight arrangement is required.<sup id="cite_ref-Singh-2019_19-7" class="reference"><a href="#cite_note-Singh-2019-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li></ul> <div class="mw-heading mw-heading3"><h3 id="Lime_plaster">Lime plaster</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=8" title="Edit section: Lime plaster"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main article: <a href="/wiki/Lime_plaster" title="Lime plaster">Lime plaster</a></div> <p>Lime plaster is a mixture of <a href="/wiki/Calcium_hydroxide" title="Calcium hydroxide">calcium hydroxide</a> and sand (or other inert fillers). Carbon dioxide in the atmosphere causes the plaster to set by transforming the calcium hydroxide into <a href="/wiki/Calcium_carbonate" title="Calcium carbonate">calcium carbonate</a> (<a href="/wiki/Limestone" title="Limestone">limestone</a>). <a href="/wiki/Whitewash" title="Whitewash">Whitewash</a> is based on the same chemistry. </p><p>To make lime plaster, limestone (calcium carbonate) is heated above approximately 850 °C (1600 °F) to produce <a href="/wiki/Quicklime" class="mw-redirect" title="Quicklime">quicklime</a> (calcium oxide). Water is then added to produce <a href="/wiki/Slaked_lime" class="mw-redirect" title="Slaked lime">slaked lime</a> (calcium hydroxide), which is sold as a wet putty or a white powder. Additional water is added to form a paste prior to use. The paste may be stored in airtight containers. When exposed to the atmosphere, the calcium hydroxide very slowly turns back into calcium carbonate through reaction with atmospheric carbon dioxide, causing the plaster to increase in strength. </p><p>Lime plaster was a common building material for wall surfaces in a process known as <a href="/wiki/Lath_and_plaster" title="Lath and plaster">lath and plaster</a>, whereby a series of wooden strips on a <a href="/wiki/Wall_stud" title="Wall stud">studwork</a> frame was covered with a semi-dry plaster that hardened into a surface. The plaster used in most lath and plaster construction was mainly <a href="/wiki/Lime_plaster" title="Lime plaster">lime plaster</a>, with a cure time of about a month. To stabilize the lime plaster during curing, small amounts of plaster of Paris were incorporated into the mix. Because plaster of Paris sets quickly, "retardants" were used to slow setting time enough to allow workers to mix large working quantities of lime putty plaster. A modern form of this method uses expanded metal mesh over wood or metal structures, which allows a great freedom of design as it is adaptable to both simple and compound curves. Today this building method has been partly replaced with <a href="/wiki/Drywall" title="Drywall">drywall</a>, also composed mostly of gypsum plaster. In both these methods, a primary advantage of the material is that it is resistant to a fire within a room and so can assist in reducing or eliminating structural damage or destruction provided the fire is promptly extinguished. </p><p>Lime plaster is used for <a href="/wiki/Fresco" title="Fresco">frescoes</a>, where <a href="/wiki/Pigment" title="Pigment">pigments</a>, diluted in water, are applied to the still wet plaster. </p><p>USA and Iran are the main plaster producers in the world. <sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (April 2015)">citation needed</span></a></i>]</sup> </p> <div class="mw-heading mw-heading3"><h3 id="Cement_plaster">Cement plaster</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=9" title="Edit section: Cement plaster"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Cement_render" title="Cement render">Cement render</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Plasterer_at_work_on_a_wall_arp.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/af/Plasterer_at_work_on_a_wall_arp.jpg/220px-Plasterer_at_work_on_a_wall_arp.jpg" decoding="async" width="220" height="163" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/af/Plasterer_at_work_on_a_wall_arp.jpg/330px-Plasterer_at_work_on_a_wall_arp.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/af/Plasterer_at_work_on_a_wall_arp.jpg/440px-Plasterer_at_work_on_a_wall_arp.jpg 2x" data-file-width="2664" data-file-height="1969" /></a><figcaption>Plastering an internal wall</figcaption></figure> <p>Cement plaster is a mixture of suitable plaster, sand, <a href="/wiki/Portland_cement" title="Portland cement">Portland cement</a> and water which is normally applied to masonry interiors and exteriors to achieve a smooth surface. Interior surfaces sometimes receive a final layer of gypsum plaster. Walls constructed with <a href="/wiki/London_stock_brick" title="London stock brick">stock bricks</a> are normally plastered while <a href="/wiki/Brickwork" title="Brickwork">face brick</a> walls are not plastered. Various cement-based plasters are also used as proprietary spray fireproofing products. These usually use <a href="/wiki/Vermiculite" title="Vermiculite">vermiculite</a> as lightweight aggregate. Heavy versions of such plasters are also in use for exterior fireproofing, to protect LPG vessels, pipe bridges and vessel skirts. </p><p>Cement plaster was first introduced in America around 1909 and was often called by the generic name <i>adamant plaster</i> after a prominent manufacturer of the time. The advantages of cement plaster noted at that time were its strength, hardness, quick setting time and durability.<sup id="cite_ref-23" class="reference"><a href="#cite_note-23"><span class="cite-bracket">[</span>23<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading3"><h3 id="Heat-resistant_plaster">Heat-resistant plaster</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=10" title="Edit section: Heat-resistant plaster"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Heat-resistant plaster is a building material used for coating walls and chimney breasts and for use as a fire barrier in ceilings. Its purpose is to replace conventional gypsum plasters in cases where the temperature can get too high for gypsum plaster to stay on the wall or ceiling. </p><p>An example of a heat-resistant plaster composition is a mixture of <a href="/wiki/Portland_cement" title="Portland cement">Portland cement</a>, gypsum, lime, exfoliated insulating aggregate (<a href="/wiki/Perlite" title="Perlite">perlite</a> and <a href="/wiki/Vermiculite" title="Vermiculite">vermiculite</a> or <a href="/wiki/Mica" title="Mica">mica</a>), <a href="/wiki/Phosphorite" title="Phosphorite">phosphate shale</a>, and small amounts of adhesive binder (such as <a href="/wiki/Gum_karaya" title="Gum karaya">Gum karaya</a>), and a detergent agent (such as <a href="/wiki/Alkylbenzene_sulfonates" class="mw-redirect" title="Alkylbenzene sulfonates">sodium dodecylbenzene sulfonate</a>).<sup id="cite_ref-heat_24-0" class="reference"><a href="#cite_note-heat-24"><span class="cite-bracket">[</span>24<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Applications">Applications</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=11" title="Edit section: Applications"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <div class="mw-heading mw-heading3"><h3 id="In_decorative_architecture">In decorative architecture</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=12" title="Edit section: In decorative architecture"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Main articles: <a href="/wiki/Stucco" title="Stucco">Stucco</a> and <a href="/wiki/Plasterwork" title="Plasterwork">Plasterwork</a></div><ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:John_Cranch_-_Plasterer_-_Google_Art_Project.jpg" class="mw-file-description" title="Early 19th Century plasterer at work – painting by John Cranch (1751–1821)"><img alt="Early 19th Century plasterer at work – painting by John Cranch (1751–1821)" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/John_Cranch_-_Plasterer_-_Google_Art_Project.jpg/120px-John_Cranch_-_Plasterer_-_Google_Art_Project.jpg" decoding="async" width="120" height="109" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/John_Cranch_-_Plasterer_-_Google_Art_Project.jpg/180px-John_Cranch_-_Plasterer_-_Google_Art_Project.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d2/John_Cranch_-_Plasterer_-_Google_Art_Project.jpg/240px-John_Cranch_-_Plasterer_-_Google_Art_Project.jpg 2x" data-file-width="4457" data-file-height="4045" /></a></span></div> <div class="gallerytext">Early 19th Century plasterer at work – painting by <a href="/wiki/John_Cranch_(English_painter)" title="John Cranch (English painter)">John Cranch</a> (1751–1821)</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:Gachbori_kashan.jpg" class="mw-file-description" title="19th century stucco plasterwork from House of Borujerdies in Kashan, Iran"><img alt="19th century stucco plasterwork from House of Borujerdies in Kashan, Iran" src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Gachbori_kashan.jpg/120px-Gachbori_kashan.jpg" decoding="async" width="120" height="78" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Gachbori_kashan.jpg/180px-Gachbori_kashan.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f1/Gachbori_kashan.jpg/240px-Gachbori_kashan.jpg 2x" data-file-width="640" data-file-height="416" /></a></span></div> <div class="gallerytext">19th century <a href="/wiki/Stucco" title="Stucco">stucco</a> plasterwork from <a href="/wiki/Borujerdi_House" title="Borujerdi House">House of Borujerdies</a> in <a href="/wiki/Kashan" title="Kashan">Kashan</a>, <a href="/wiki/Iran" title="Iran">Iran</a></div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:Face_plaster_cast_application.jpg" class="mw-file-description" title="Face plaster casting bandage application"><img alt="Face plaster casting bandage application" src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Face_plaster_cast_application.jpg/120px-Face_plaster_cast_application.jpg" decoding="async" width="120" height="119" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Face_plaster_cast_application.jpg/180px-Face_plaster_cast_application.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Face_plaster_cast_application.jpg/240px-Face_plaster_cast_application.jpg 2x" data-file-width="3456" data-file-height="3417" /></a></span></div> <div class="gallerytext">Face plaster casting <a href="/wiki/Bandage" title="Bandage">bandage</a> application</div> </li> </ul><p>Plaster may also be used to create complex detailing for use in room interiors. These may be geometric (simulating wood or stone) or naturalistic (simulating leaves, vines, and flowers). These are also often used to simulate wood or stone detailing found in more substantial buildings. </p><p>In modern days this material is also used for <a href="/wiki/Dropped_ceiling" title="Dropped ceiling">false ceiling</a>. In this, the powder form is converted in a sheet form and the sheet is then attached to the basic ceiling with the help of fasteners. It is done in various designs containing various combinations of lights and colors. The common use of this plaster can be seen in the construction of houses. Post-construction, direct painting is possible (which is commonly seen in French architecture), but elsewhere plaster is used. The walls are painted with the plaster which (in some countries) is nothing but calcium carbonate. After drying the calcium carbonate plaster turns white and then the wall is ready to be painted. Elsewhere in the world, such as the UK, ever finer layers of plaster are added on top of the <a href="/wiki/Drywall" title="Drywall">plasterboard</a> (or sometimes the brick wall directly) to give a smooth brown polished texture ready for painting. </p> <div class="mw-heading mw-heading3"><h3 id="Art">Art</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=13" title="Edit section: Art"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">See also: <a href="/wiki/Plaster_cast" title="Plaster cast">Plaster cast</a></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Sch_op_8.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/en/thumb/4/44/Sch_op_8.jpg/220px-Sch_op_8.jpg" decoding="async" width="220" height="275" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/4/44/Sch_op_8.jpg 1.5x" data-file-width="240" data-file-height="300" /></a><figcaption>Example of a stenciled plaster design</figcaption></figure> <p>Mural paintings are commonly painted onto a plaster secondary support. Some, like Michelangelo's <a href="/wiki/Sistine_Chapel_ceiling" title="Sistine Chapel ceiling">Sistine Chapel ceiling</a>, are executed in <a href="/wiki/Fresco" title="Fresco">fresco</a>, meaning they are painted on a thin layer of wet plaster, called <a href="/wiki/Intonaco" title="Intonaco">intonaco</a>; the pigments sink into this layer so that the plaster itself becomes the medium holding them, which accounts for the excellent durability of fresco. Additional work may be added <i>a secco</i> on top of the dry plaster, though this is generally less durable. </p><p>Plaster (often called <a href="/wiki/Stucco" title="Stucco">stucco</a> in this context) is a far easier material for making <a href="/wiki/Relief" title="Relief">reliefs</a> than stone or wood, and was widely used for large interior wall-reliefs in Egypt and the <a href="/wiki/Near_East" title="Near East">Near East</a> from antiquity into Islamic times (latterly for architectural decoration, as at the <a href="/wiki/Alhambra" title="Alhambra">Alhambra</a>), Rome, and Europe from at least the Renaissance, as well as probably elsewhere. However, it needs very good conditions to survive long in unmaintained buildings – Roman decorative plasterwork is mainly known from <a href="/wiki/Pompeii" title="Pompeii">Pompeii</a> and other sites buried by ash from <a href="/wiki/Mount_Vesuvius" title="Mount Vesuvius">Mount Vesuvius</a>. </p><p>Plaster may be cast directly into a damp clay mold. In creating this <i>piece molds</i> (molds designed for making multiple copies) or <i>waste molds</i> (for single use) would be made of plaster. This "negative" image, if properly designed, may be used to produce clay productions, which when fired in a kiln become <a href="/wiki/Terra_cotta" class="mw-redirect" title="Terra cotta">terra cotta</a> building decorations, or these may be used to create cast <a href="/wiki/Concrete" title="Concrete">concrete</a> sculptures. If a plaster positive was desired this would be constructed or cast to form a durable image artwork. As a model for stonecutters this would be sufficient. If intended for producing a bronze casting the plaster positive could be further worked to produce smooth surfaces. An advantage of this plaster image is that it is relatively cheap; should a patron approve of the durable image and be willing to bear further expense, subsequent molds could be made for the creation of a wax image to be used in <a href="/wiki/Lost_wax_casting" class="mw-redirect" title="Lost wax casting">lost wax casting</a>, a far more expensive process. In lieu of producing a bronze image suitable for outdoor use the plaster image may be painted to resemble a metal image; such sculptures are suitable only for presentation in a weather-protected environment. </p><p>Plaster expands while hardening then contracts slightly just before hardening completely. This makes plaster excellent for use in molds, and it is often used as an artistic material for casting. Plaster is also commonly spread over an armature (form), made of wire mesh, cloth, or other materials; a process for adding raised details. For these processes, limestone or acrylic based plaster may be employed, known as stucco. <sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (October 2008)">citation needed</span></a></i>]</sup> </p><p>Products composed mainly of plaster of Paris and a small amount of <a href="/wiki/Portland_cement" title="Portland cement">Portland cement</a> are used for casting sculptures and other art objects as well as molds. Considerably harder and stronger than straight plaster of Paris, these products are for indoor use only as they degrade in moist conditions. </p> <div class="mw-heading mw-heading3"><h3 id="Medicine">Medicine</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=14" title="Edit section: Medicine"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Plaster is widely used as a support for broken bones; a bandage impregnated with plaster is moistened and then wrapped around the damaged limb, setting into a close-fitting yet easily removed tube, known as an <a href="/wiki/Orthopedic_cast" title="Orthopedic cast">orthopedic cast</a>. </p><p>Plaster is also used in preparation for <a href="/wiki/Radiotherapy" class="mw-redirect" title="Radiotherapy">radiotherapy</a> when fabricating individualized immobilization shells for patients. Plaster bandages are used to construct an impression of a patient's head and neck, and liquid plaster is used to fill the impression and produce a plaster bust. The transparent material <a href="/wiki/Poly(methyl_methacrylate)" title="Poly(methyl methacrylate)">polymethyl methacrylate</a> (Plexiglas, Perspex) is then vacuum formed over this bust to create a clear face mask which will hold the patient's head steady while radiation is being delivered.<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (October 2008)">citation needed</span></a></i>]</sup> </p><p>In dentistry, plaster is used for mounting casts or models of oral tissues. These diagnostic and working models are usually made from dental stone, a stronger, harder and denser derivative of plaster which is manufactured from gypsum under pressure. Plaster is also used to invest and flask wax dentures, the wax being subsequently removed by "burning out," and replaced with flowable denture base material. The typically acrylic denture base then cures in the plaster investment mold. Plaster investments can withstand the high heat and pressure needed to ensure a rigid denture base. Moreover, in dentistry there are 5 types of gypsum products depending on their consistency and uses: 1) impression plaster (type 1), 2) model plaster (type 2), dental stones (types 3, 4 and 5)<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (October 2008)">citation needed</span></a></i>]</sup> </p><p>In orthotics and prosthetics, plaster bandages traditionally were used to create impressions of the patient's limb (or residuum). This negative impression was then, itself, filled with plaster of Paris, to create a positive model of the limb and used in fabricating the final medical device. </p><p>In addition, <a href="/wiki/Dentures" title="Dentures">dentures</a> (false teeth) are made by first taking a <a href="/wiki/Dental_impression" title="Dental impression">dental impression</a> using a soft, pliable material that can be removed from around the teeth and gums without loss of fidelity and using the impression to creating a wax model of the teeth and gums. The model is used to create a plaster mold (which is heated so the wax melts and flows out) and the denture materials are injected into the mold. After a curing period, the mold is opened and the dentures are cleaned up and polished. </p> <div class="mw-heading mw-heading3"><h3 id="Fire_protection">Fire protection</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=15" title="Edit section: Fire protection"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1251242444"><table class="box-Unreferenced_section plainlinks metadata ambox ambox-content ambox-Unreferenced" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This section <b>does not <a href="/wiki/Wikipedia:Citing_sources" title="Wikipedia:Citing sources">cite</a> any <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">sources</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Plaster" title="Special:EditPage/Plaster">improve this section</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and <a href="/wiki/Wikipedia:Verifiability#Burden_of_evidence" title="Wikipedia:Verifiability">removed</a>.</span> <span class="date-container"><i>(<span class="date">February 2020</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:Himeji_Castle_The_Keep_Towers.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/3/35/Himeji_Castle_The_Keep_Towers.jpg/220px-Himeji_Castle_The_Keep_Towers.jpg" decoding="async" width="220" height="165" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/35/Himeji_Castle_The_Keep_Towers.jpg/330px-Himeji_Castle_The_Keep_Towers.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/35/Himeji_Castle_The_Keep_Towers.jpg/440px-Himeji_Castle_The_Keep_Towers.jpg 2x" data-file-width="2272" data-file-height="1704" /></a><figcaption><i><a href="/wiki/Himeji_Castle" title="Himeji Castle">Himeji Castle</a></i>, <a href="/wiki/Himeji" title="Himeji">Himeji</a>, <a href="/wiki/Hyogo_Prefecture" class="mw-redirect" title="Hyogo Prefecture">Hyogo Prefecture</a>, <a href="/wiki/Japan" title="Japan">Japan</a></figcaption></figure> <p>Plasters have been in use in <a href="/wiki/Passive_fire_protection" title="Passive fire protection">passive fire protection</a>, as <a href="/wiki/Fireproofing" title="Fireproofing">fireproofing</a> products, for many decades. </p><p>Gypsum plaster releases water vapor when exposed to flame, acting to slow the spread of the fire, for as much as an hour or two depending on thickness. Plaster also provides some <a href="/wiki/Thermal_insulation" title="Thermal insulation">insulation</a> to retard <a href="/wiki/Heat" title="Heat">heat</a> flow into <a href="/wiki/Structural_steel" title="Structural steel">structural steel</a> elements, that would otherwise lose their strength and collapse in a fire. Early versions of protective plasters often contain <a href="/wiki/Asbestos" title="Asbestos">asbestos</a> fibres, which since have been outlawed in many industrialized nations. </p><p>Recent plasters for fire protection either contain cement or gypsum as binding agents as well as mineral wool or glass fiber to add mechanical strength. <a href="/wiki/Vermiculite" title="Vermiculite">Vermiculite</a>, <a href="/wiki/Polystyrene" title="Polystyrene">polystyrene</a> beads or chemical expansion agents are often added to decrease the density of the finished product and increase thermal insulation. </p><p>One differentiates between interior and exterior fireproofing. Interior products are typically less substantial, with lower densities and lower cost. Exterior products have to withstand harsher environmental conditions. A rough surface is typically forgiven inside of buildings as dropped ceilings often hide them. Fireproofing plasters are losing ground to more costly <a href="/wiki/Intumescent" title="Intumescent">intumescent</a> and <a href="/wiki/Endothermic" class="mw-redirect" title="Endothermic">endothermic</a> products, simply on technical merit. Trade jurisdiction on unionized construction sites in North America remains with the plasterers, regardless of whether the plaster is decorative in nature or is used in passive fire protection. Cementitious and gypsum based plasters tend to be endothermic. Fireproofing plasters are closely related to <a href="/wiki/Firestop" title="Firestop">firestop</a> mortars. Most firestop mortars can be sprayed and tooled very well, due to the fine detail work that is required of firestopping. </p> <div class="mw-heading mw-heading3"><h3 id="3D_printing">3D printing</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=16" title="Edit section: 3D printing"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p><a href="/wiki/Powder_bed_and_inkjet_head_3D_printing" title="Powder bed and inkjet head 3D printing">Powder bed and inkjet head 3D printing</a> is commonly based on the reaction of gypsum plaster with water, where the water is selectively applied by the inkjet head. </p> <div class="mw-heading mw-heading3"><h3 id="Gallery">Gallery</h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=17" title="Edit section: Gallery"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 205px"> <div class="thumb" style="width: 200px; height: 200px;"><span typeof="mw:File"><a href="/wiki/File:Plaster_-_Putz_in_Pompeji.JPG" class="mw-file-description" title="Plasterwork in Pompeii (79 AD)"><img alt="Plasterwork in Pompeii (79 AD)" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Plaster_-_Putz_in_Pompeji.JPG/113px-Plaster_-_Putz_in_Pompeji.JPG" decoding="async" width="113" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Plaster_-_Putz_in_Pompeji.JPG/170px-Plaster_-_Putz_in_Pompeji.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Plaster_-_Putz_in_Pompeji.JPG/226px-Plaster_-_Putz_in_Pompeji.JPG 2x" data-file-width="2304" data-file-height="3456" /></a></span></div> <div class="gallerytext">Plasterwork in <a href="/wiki/Pompeii" title="Pompeii">Pompeii</a> (79 AD)</div> </li> <li class="gallerybox" style="width: 205px"> <div class="thumb" style="width: 200px; height: 200px;"><span typeof="mw:File"><a href="/wiki/File:Figure_of_a_Woman_MET_DP329926.jpg" class="mw-file-description" title="Figure of a woman; 5th century; painted plaster; height: 38.4 cm (15"), width: 14.7 cm (6"), depth: 9.6 cm (4"); Metropolitan Museum of Art"><img alt="Figure of a woman; 5th century; painted plaster; height: 38.4 cm (15"), width: 14.7 cm (6"), depth: 9.6 cm (4"); Metropolitan Museum of Art" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/00/Figure_of_a_Woman_MET_DP329926.jpg/115px-Figure_of_a_Woman_MET_DP329926.jpg" decoding="async" width="115" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/00/Figure_of_a_Woman_MET_DP329926.jpg/173px-Figure_of_a_Woman_MET_DP329926.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/00/Figure_of_a_Woman_MET_DP329926.jpg/231px-Figure_of_a_Woman_MET_DP329926.jpg 2x" data-file-width="2637" data-file-height="3885" /></a></span></div> <div class="gallerytext">Figure of a woman; 5th century; painted plaster; height: 38.4 cm (15"), width: 14.7 cm (6"), depth: 9.6 cm (4"); Metropolitan Museum of Art</div> </li> <li class="gallerybox" style="width: 205px"> <div class="thumb" style="width: 200px; height: 200px;"><span typeof="mw:File"><a href="/wiki/File:Seated_Voltaire_MET_DP105166.jpg" class="mw-file-description" title="Seated Voltaire; by Jean-Antoine Houdon; 1778; plaster, tinted to imitate terracotta; overall: 35.6 × 14.6 x 20 cm (14" × 5¾" × 8"); Metropolitan Museum of Art"><img alt="Seated Voltaire; by Jean-Antoine Houdon; 1778; plaster, tinted to imitate terracotta; overall: 35.6 × 14.6 x 20 cm (14" × 5¾" × 8"); Metropolitan Museum of Art" src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Seated_Voltaire_MET_DP105166.jpg/132px-Seated_Voltaire_MET_DP105166.jpg" decoding="async" width="132" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Seated_Voltaire_MET_DP105166.jpg/198px-Seated_Voltaire_MET_DP105166.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Seated_Voltaire_MET_DP105166.jpg/263px-Seated_Voltaire_MET_DP105166.jpg 2x" data-file-width="1504" data-file-height="1940" /></a></span></div> <div class="gallerytext"><i>Seated Voltaire</i>; by <a href="/wiki/Jean-Antoine_Houdon" title="Jean-Antoine Houdon">Jean-Antoine Houdon</a>; 1778; plaster, tinted to imitate terracotta; overall: 35.6 × 14.6 x 20 cm (14" × 5¾" × 8"); Metropolitan Museum of Art</div> </li> <li class="gallerybox" style="width: 205px"> <div class="thumb" style="width: 200px; height: 200px;"><span typeof="mw:File"><a href="/wiki/File:Young_girl_identified_as_Anne_Aud%C3%A9oud_of_Geneva_(1776%E2%80%931840)_MET_DP370292.jpg" class="mw-file-description" title="Young girl; first modeled: 1779–1780; plaster; height: 36.8 cm (14½"); Metropolitan Museum of Art"><img alt="Young girl; first modeled: 1779–1780; plaster; height: 36.8 cm (14½"); Metropolitan Museum of Art" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Young_girl_identified_as_Anne_Aud%C3%A9oud_of_Geneva_%281776%E2%80%931840%29_MET_DP370292.jpg/127px-Young_girl_identified_as_Anne_Aud%C3%A9oud_of_Geneva_%281776%E2%80%931840%29_MET_DP370292.jpg" decoding="async" width="127" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Young_girl_identified_as_Anne_Aud%C3%A9oud_of_Geneva_%281776%E2%80%931840%29_MET_DP370292.jpg/191px-Young_girl_identified_as_Anne_Aud%C3%A9oud_of_Geneva_%281776%E2%80%931840%29_MET_DP370292.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d0/Young_girl_identified_as_Anne_Aud%C3%A9oud_of_Geneva_%281776%E2%80%931840%29_MET_DP370292.jpg/255px-Young_girl_identified_as_Anne_Aud%C3%A9oud_of_Geneva_%281776%E2%80%931840%29_MET_DP370292.jpg 2x" data-file-width="3001" data-file-height="4000" /></a></span></div> <div class="gallerytext">Young girl; first modeled: 1779–1780; plaster; height: 36.8 cm (14½"); Metropolitan Museum of Art</div> </li> <li class="gallerybox" style="width: 205px"> <div class="thumb" style="width: 200px; height: 200px;"><span typeof="mw:File"><a href="/wiki/File:Nymph_MET_DP214931.jpg" class="mw-file-description" title="Nymph; 1805–1810; plaster; height: 155.6 cm (5'1¼"); Metropolitan Museum of Art"><img alt="Nymph; 1805–1810; plaster; height: 155.6 cm (5'1¼"); Metropolitan Museum of Art" src="//upload.wikimedia.org/wikipedia/commons/thumb/2/22/Nymph_MET_DP214931.jpg/121px-Nymph_MET_DP214931.jpg" decoding="async" width="121" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/22/Nymph_MET_DP214931.jpg/182px-Nymph_MET_DP214931.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/22/Nymph_MET_DP214931.jpg/243px-Nymph_MET_DP214931.jpg 2x" data-file-width="1430" data-file-height="2000" /></a></span></div> <div class="gallerytext">Nymph; 1805–1810; plaster; height: 155.6 cm (5'1¼"); Metropolitan Museum of Art</div> </li> <li class="gallerybox" style="width: 205px"> <div class="thumb" style="width: 200px; height: 200px;"><span typeof="mw:File"><a href="/wiki/File:%C3%89douard_Baldus,_Plaster_Model_of_an_Ornamental_Oeil-de-Boeuf_for_the_New_Louvre,_ca._1856.jpg" class="mw-file-description" title="Photo of a plaster model of an ornamental oeil-de-boeuf for the new Louvre; circa 1856; Metropolitan Museum of Art"><img alt="Photo of a plaster model of an ornamental oeil-de-boeuf for the new Louvre; circa 1856; Metropolitan Museum of Art" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/0f/%C3%89douard_Baldus%2C_Plaster_Model_of_an_Ornamental_Oeil-de-Boeuf_for_the_New_Louvre%2C_ca._1856.jpg/128px-%C3%89douard_Baldus%2C_Plaster_Model_of_an_Ornamental_Oeil-de-Boeuf_for_the_New_Louvre%2C_ca._1856.jpg" decoding="async" width="128" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/0f/%C3%89douard_Baldus%2C_Plaster_Model_of_an_Ornamental_Oeil-de-Boeuf_for_the_New_Louvre%2C_ca._1856.jpg/193px-%C3%89douard_Baldus%2C_Plaster_Model_of_an_Ornamental_Oeil-de-Boeuf_for_the_New_Louvre%2C_ca._1856.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/0f/%C3%89douard_Baldus%2C_Plaster_Model_of_an_Ornamental_Oeil-de-Boeuf_for_the_New_Louvre%2C_ca._1856.jpg/257px-%C3%89douard_Baldus%2C_Plaster_Model_of_an_Ornamental_Oeil-de-Boeuf_for_the_New_Louvre%2C_ca._1856.jpg 2x" data-file-width="611" data-file-height="808" /></a></span></div> <div class="gallerytext">Photo of a plaster model of an ornamental oeil-de-boeuf for the <a href="/wiki/Nouveau_Louvre" class="mw-redirect" title="Nouveau Louvre">new Louvre</a>; circa 1856; Metropolitan Museum of Art</div> </li> <li class="gallerybox" style="width: 205px"> <div class="thumb" style="width: 200px; height: 200px;"><span typeof="mw:File"><a href="/wiki/File:Jupiter_and_the_Sphinx_MET_DP242123.jpg" class="mw-file-description" title="Jupiter and the Sphinx; 1868; tinted plaster; 116.8 × 112.1 × 60.3 cm (3'10" × 3'8" × 1'11¾"); Metropolitan Museum of Art"><img alt="Jupiter and the Sphinx; 1868; tinted plaster; 116.8 × 112.1 × 60.3 cm (3'10" × 3'8" × 1'11¾"); Metropolitan Museum of Art" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Jupiter_and_the_Sphinx_MET_DP242123.jpg/170px-Jupiter_and_the_Sphinx_MET_DP242123.jpg" decoding="async" width="170" height="136" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Jupiter_and_the_Sphinx_MET_DP242123.jpg/255px-Jupiter_and_the_Sphinx_MET_DP242123.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d2/Jupiter_and_the_Sphinx_MET_DP242123.jpg/340px-Jupiter_and_the_Sphinx_MET_DP242123.jpg 2x" data-file-width="3915" data-file-height="3122" /></a></span></div> <div class="gallerytext"><i>Jupiter and the Sphinx</i>; 1868; tinted plaster; 116.8 × 112.1 × 60.3 cm (3'10" × 3'8" × 1'11¾"); Metropolitan Museum of Art</div> </li> <li class="gallerybox" style="width: 205px"> <div class="thumb" style="width: 200px; height: 200px;"><span typeof="mw:File"><a href="/wiki/File:The_Young_Mother_by_Bessie_Potter_Vonnoh,_c._1896,_plaster_-_Portland_Museum_of_Art_-_Portland,_Maine_-_DSC03949.jpg" class="mw-file-description" title="The Young Mother; by Bessie Potter Vonnoh; circa 1896; plaster; Portland Museum of Art (Portland, US)"><img alt="The Young Mother; by Bessie Potter Vonnoh; circa 1896; plaster; Portland Museum of Art (Portland, US)" src="//upload.wikimedia.org/wikipedia/commons/thumb/e/e0/The_Young_Mother_by_Bessie_Potter_Vonnoh%2C_c._1896%2C_plaster_-_Portland_Museum_of_Art_-_Portland%2C_Maine_-_DSC03949.jpg/127px-The_Young_Mother_by_Bessie_Potter_Vonnoh%2C_c._1896%2C_plaster_-_Portland_Museum_of_Art_-_Portland%2C_Maine_-_DSC03949.jpg" decoding="async" width="127" height="170" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/e/e0/The_Young_Mother_by_Bessie_Potter_Vonnoh%2C_c._1896%2C_plaster_-_Portland_Museum_of_Art_-_Portland%2C_Maine_-_DSC03949.jpg/191px-The_Young_Mother_by_Bessie_Potter_Vonnoh%2C_c._1896%2C_plaster_-_Portland_Museum_of_Art_-_Portland%2C_Maine_-_DSC03949.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/e/e0/The_Young_Mother_by_Bessie_Potter_Vonnoh%2C_c._1896%2C_plaster_-_Portland_Museum_of_Art_-_Portland%2C_Maine_-_DSC03949.jpg/255px-The_Young_Mother_by_Bessie_Potter_Vonnoh%2C_c._1896%2C_plaster_-_Portland_Museum_of_Art_-_Portland%2C_Maine_-_DSC03949.jpg 2x" data-file-width="3635" data-file-height="4846" /></a></span></div> <div class="gallerytext"><i>The Young Mother</i>; by <a href="/wiki/Bessie_Potter_Vonnoh" title="Bessie Potter Vonnoh">Bessie Potter Vonnoh</a>; circa 1896; plaster; <a href="/wiki/Portland_Museum_of_Art" title="Portland Museum of Art">Portland Museum of Art</a> (<a href="/wiki/Portland,_Maine" title="Portland, Maine">Portland</a>, US)</div> </li> </ul> <div class="mw-heading mw-heading2"><h2 id="Safety_issues">Safety issues</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=18" title="Edit section: Safety issues"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The chemical reaction that occurs when plaster is mixed with water is <a href="/wiki/Exothermic" class="mw-redirect" title="Exothermic">exothermic</a>. When plaster sets, it can reach temperatures of more than 60 °C (140 °F) and, in large volumes, can burn the skin. In January 2007, a secondary school student in <a href="/wiki/Lincolnshire" title="Lincolnshire">Lincolnshire</a>, <a href="/wiki/England" title="England">England</a> sustained <a href="/wiki/Third-degree_burn" class="mw-redirect" title="Third-degree burn">third-degree burns</a> after encasing her hands in a bucket of plaster as part of a school art project.<sup id="cite_ref-25" class="reference"><a href="#cite_note-25"><span class="cite-bracket">[</span>25<span class="cite-bracket">]</span></a></sup> </p><p>Plaster that contains powdered <a href="/wiki/Silica" class="mw-redirect" title="Silica">silica</a> or <a href="/wiki/Asbestos" title="Asbestos">asbestos</a> presents health hazards if inhaled repeatedly. Asbestos is a known <a href="/wiki/Irritation" title="Irritation">irritant</a> when inhaled and can cause cancer, especially in people who smoke,<sup id="cite_ref-26" class="reference"><a href="#cite_note-26"><span class="cite-bracket">[</span>26<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-27" class="reference"><a href="#cite_note-27"><span class="cite-bracket">[</span>27<span class="cite-bracket">]</span></a></sup> and inhalation can also cause <a href="/wiki/Asbestosis" title="Asbestosis">asbestosis</a>. Inhaled silica can cause <a href="/wiki/Silicosis" title="Silicosis">silicosis</a> and (in very rare cases) can encourage the development of <a href="/wiki/Cancer" title="Cancer">cancer</a>.<sup id="cite_ref-28" class="reference"><a href="#cite_note-28"><span class="cite-bracket">[</span>28<span class="cite-bracket">]</span></a></sup> Persons working regularly with plaster containing these additives should take precautions to avoid inhaling powdered plaster, cured or uncured. </p><p>People can be exposed to plaster of Paris in the workplace by breathing it in, swallowing it, skin contact, and eye contact. The <a href="/wiki/Occupational_Safety_and_Health_Administration" title="Occupational Safety and Health Administration">Occupational Safety and Health Administration</a> (OSHA) has set the legal limit (<a href="/wiki/Permissible_exposure_limit" title="Permissible exposure limit">permissible exposure limit</a>) for plaster of Paris exposure in the workplace as 15 mg/m<sup>3</sup> total exposure and 5 mg/m<sup>3</sup> respiratory exposure over an 8-hour workday. The <a href="/wiki/National_Institute_for_Occupational_Safety_and_Health" title="National Institute for Occupational Safety and Health">National Institute for Occupational Safety and Health</a> (NIOSH) has set a <a href="/wiki/Recommended_exposure_limit" title="Recommended exposure limit">Recommended exposure limit</a> (REL) of 10 mg/m<sup>3</sup> total exposure and 5 mg/m<sup>3</sup> respiratory exposure over an 8-hour workday.<sup id="cite_ref-29" class="reference"><a href="#cite_note-29"><span class="cite-bracket">[</span>29<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=19" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1184024115">.mw-parser-output .div-col{margin-top:0.3em;column-width:30em}.mw-parser-output .div-col-small{font-size:90%}.mw-parser-output .div-col-rules{column-rule:1px solid #aaa}.mw-parser-output .div-col dl,.mw-parser-output .div-col ol,.mw-parser-output .div-col ul{margin-top:0}.mw-parser-output .div-col li,.mw-parser-output .div-col dd{page-break-inside:avoid;break-inside:avoid-column}</style><div class="div-col" style="column-width: 30em;"> <ul><li><a href="/wiki/Anhydrite" title="Anhydrite">Anhydrite</a></li> <li><a href="/wiki/Bughole" title="Bughole">Bughole</a>, a structural defect in concrete or plaster</li> <li><a href="/wiki/Calcium_Sulfate" class="mw-redirect" title="Calcium Sulfate">Calcium Sulfate</a></li> <li><a href="/wiki/Cast_Courts_(Victoria_and_Albert_Museum)" title="Cast Courts (Victoria and Albert Museum)">Cast Courts (Victoria and Albert Museum)</a></li> <li><a href="/wiki/Clay_panel" title="Clay panel">Clay panel</a></li> <li><a href="/wiki/Diapalma" title="Diapalma">Diapalma</a></li> <li><a href="/wiki/Harl" class="mw-redirect" title="Harl">Harl</a>, a lime-plaster exterior finish used on buildings in Scotland</li> <li><a href="/wiki/International_Union_of_Bricklayers_and_Allied_Craftworkers" title="International Union of Bricklayers and Allied Craftworkers">International Union of Bricklayers and Allied Craftworkers</a></li> <li><a href="/wiki/Intumescent" title="Intumescent">Intumescent</a>, a fire-protection additive in some plasters</li> <li><a href="/wiki/Intonaco" title="Intonaco">Intonaco</a>, the plaster coat on and in which a <a href="/wiki/Fresco" title="Fresco">fresco</a> is painted</li> <li><a href="/wiki/Joint_compound" title="Joint compound">Joint compound</a></li> <li><a href="/wiki/Lath_and_plaster" title="Lath and plaster">Lath and plaster</a>, a construction method</li> <li><a href="/wiki/Opus_albarium" title="Opus albarium">Opus albarium</a>, a marble plaster used in fine decorative work</li> <li><a href="/wiki/Passive_fire_protection" title="Passive fire protection">Passive fire protection</a></li> <li><a href="/wiki/Parge_coat" class="mw-redirect" title="Parge coat">Parge coat</a>, a thin layer of plaster added to an outside wall</li> <li><a href="/wiki/Pargeting" title="Pargeting">Pargeting</a>, a decorative or waterproofing plastering applied to building walls</li> <li><a href="/wiki/Phosphogypsum" title="Phosphogypsum">Phosphogypsum</a></li> <li><a href="/wiki/Plasterwork" title="Plasterwork">Plasterwork</a></li> <li><a href="/wiki/Polished_plaster" title="Polished plaster">Polished plaster</a></li> <li><a href="/wiki/Ready-mix_lightweight_joint_compound" class="mw-redirect" title="Ready-mix lightweight joint compound">Ready-mix lightweight joint compound</a></li> <li><a href="/wiki/Roughcast" title="Roughcast">Roughcast</a>, an exterior finish used on buildings</li> <li><a href="/wiki/Stucco" title="Stucco">Stucco</a></li> <li><a href="/wiki/Tadelakt" title="Tadelakt">Tadelakt</a>, a waterproof plaster made by ramming, polishing, and staining with soap</li> <li><a href="/wiki/Wattle_and_daub" title="Wattle and daub">Wattle and daub</a>, a construction method</li> <li><a href="/wiki/Paigah_Tombs" title="Paigah Tombs">Paigah Tombs</a>, intricate stucco work made in 19th-century Hyderabad, India</li> <li><a href="/wiki/Yeseria" class="mw-redirect" title="Yeseria">Yeseria</a>, a style of plaster sculpture used historically in the <a href="/wiki/Middle_East" title="Middle East">Middle East</a>, <a href="/wiki/Maghreb" title="Maghreb">Maghreb</a>, and <a href="/wiki/Iberian_Peninsula" title="Iberian Peninsula">Iberian Peninsula</a></li></ul></div> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=20" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap mw-references-columns"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><i>Plaster.</i> In: <style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFWeyerRoig_PicazoPopCassar2015" class="citation book cs1">Weyer, Angela; Roig Picazo, Pilar; Pop, Daniel; Cassar, JoAnn; Özköse, Aysun; Vallet, Jean-Marc; Srša, Ivan, eds. (2015). <a rel="nofollow" class="external text" href="http://elearn.hawk-hhg.de/projekte/ewaglos/pages/download.php"><i>EwaGlos. European Illustrated Glossary Of Conservation Terms For Wall Paintings And Architectural Surfaces. English Definitions with translations into Bulgarian, Croatian, French, German, Hungarian, Italian, Polish, Romanian, Spanish and Turkish</i></a>. Petersberg: Michael Imhof. p. 50.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=EwaGlos.+European+Illustrated+Glossary+Of+Conservation+Terms+For+Wall+Paintings+And+Architectural+Surfaces.+English+Definitions+with+translations+into+Bulgarian%2C+Croatian%2C+French%2C+German%2C+Hungarian%2C+Italian%2C+Polish%2C+Romanian%2C+Spanish+and+Turkish.&rft.place=Petersberg&rft.pages=50&rft.pub=Michael+Imhof&rft.date=2015&rft_id=http%3A%2F%2Felearn.hawk-hhg.de%2Fprojekte%2Fewaglos%2Fpages%2Fdownload.php&rfr_id=info%3Asid%2Fen.wikipedia.org%3APlaster" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHenryStewart2011" class="citation book cs1">Henry, Alison; Stewart, John, eds. (2011). <i>English Heritage. Practical Building Conservation. Mortars, Renders & Plasters</i>. 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Elsevier: <span class="nowrap">173–</span>185. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2F0021-9290%2873%2990086-9">10.1016/0021-9290(73)90086-9</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/4693147">4693147</a>. <q>Hardening stage of plaster of paris is basically a crystalline change in which orthorhombic form of gypsum converts into the monoclinic form of gypsum.</q></cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Journal+of+Biomechanics&rft.atitle=Mechanical+Properties+of+Orthopeadic+Plaster+Bandages&rft.volume=6&rft.issue=2&rft.pages=%3Cspan+class%3D%22nowrap%22%3E173-%3C%2Fspan%3E185&rft.date=1973&rft_id=info%3Adoi%2F10.1016%2F0021-9290%2873%2990086-9&rft_id=info%3Apmid%2F4693147&rft.aulast=Schmidt&rft.aufirst=V.+E.&rft.au=Somerset%2C+J.+H.&rft.au=Porter%2C+R.+E.&rfr_id=info%3Asid%2Fen.wikipedia.org%3APlaster" class="Z3988"></span></span> </li> <li id="cite_note-21"><span class="mw-cite-backlink"><b><a href="#cite_ref-21">^</a></b></span> <span class="reference-text">Deer, Howie, & Zussman. <i>An Introduction to the Rock Forming Minerals</i>. 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"<span class="cs1-kern-left"></span>"Tar" and nicotine content of cigarette smoke in relation to death rates". <i>Environmental Research</i>. <b>12</b> (3): <span class="nowrap">263–</span>74. <a href="/wiki/Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/1976ER.....12..263H">1976ER.....12..263H</a>. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2F0013-9351%2876%2990036-0">10.1016/0013-9351(76)90036-0</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/1001298">1001298</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Environmental+Research&rft.atitle=%22Tar%22+and+nicotine+content+of+cigarette+smoke+in+relation+to+death+rates&rft.volume=12&rft.issue=3&rft.pages=%3Cspan+class%3D%22nowrap%22%3E263-%3C%2Fspan%3E74&rft.date=1976-12&rft_id=info%3Apmid%2F1001298&rft_id=info%3Adoi%2F10.1016%2F0013-9351%2876%2990036-0&rft_id=info%3Abibcode%2F1976ER.....12..263H&rft.aulast=Hammond&rft.aufirst=EC&rft.au=Garfinkel%2C+L&rft.au=Seidman%2C+H&rft.au=Lew%2C+EA&rfr_id=info%3Asid%2Fen.wikipedia.org%3APlaster" class="Z3988"></span></span> </li> <li id="cite_note-27"><span class="mw-cite-backlink"><b><a href="#cite_ref-27">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSaracci1987" class="citation journal cs1">Saracci, R (1987). "The interactions of tobacco smoking and other agents in cancer etiology". <i>Epidemiologic Reviews</i>. <b>9</b>: <span class="nowrap">175–</span>93. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Foxfordjournals.epirev.a036301">10.1093/oxfordjournals.epirev.a036301</a>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/3315716">3315716</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Epidemiologic+Reviews&rft.atitle=The+interactions+of+tobacco+smoking+and+other+agents+in+cancer+etiology&rft.volume=9&rft.pages=%3Cspan+class%3D%22nowrap%22%3E175-%3C%2Fspan%3E93&rft.date=1987&rft_id=info%3Adoi%2F10.1093%2Foxfordjournals.epirev.a036301&rft_id=info%3Apmid%2F3315716&rft.aulast=Saracci&rft.aufirst=R&rfr_id=info%3Asid%2Fen.wikipedia.org%3APlaster" class="Z3988"></span></span> </li> <li id="cite_note-28"><span class="mw-cite-backlink"><b><a href="#cite_ref-28">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSoutarRobertsonMillerSearl2000" class="citation journal cs1">Soutar, CA; Robertson, A; Miller, BG; Searl, A; Bignon, J (January 2000). <a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fannhyg%2F44.1.3">"Epidemiological evidence on the carcinogenicity of silica: factors in scientific judgement"</a>. <i>The Annals of Occupational Hygiene</i>. <b>44</b> (1): <span class="nowrap">3–</span>14. <a href="/wiki/Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://doi.org/10.1093%2Fannhyg%2F44.1.3">10.1093/annhyg/44.1.3</a></span>. <a href="/wiki/PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/10689755">10689755</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Annals+of+Occupational+Hygiene&rft.atitle=Epidemiological+evidence+on+the+carcinogenicity+of+silica%3A+factors+in+scientific+judgement.&rft.volume=44&rft.issue=1&rft.pages=%3Cspan+class%3D%22nowrap%22%3E3-%3C%2Fspan%3E14&rft.date=2000-01&rft_id=info%3Adoi%2F10.1093%2Fannhyg%2F44.1.3&rft_id=info%3Apmid%2F10689755&rft.aulast=Soutar&rft.aufirst=CA&rft.au=Robertson%2C+A&rft.au=Miller%2C+BG&rft.au=Searl%2C+A&rft.au=Bignon%2C+J&rft_id=https%3A%2F%2Fdoi.org%2F10.1093%252Fannhyg%252F44.1.3&rfr_id=info%3Asid%2Fen.wikipedia.org%3APlaster" class="Z3988"></span></span> </li> <li id="cite_note-29"><span class="mw-cite-backlink"><b><a href="#cite_ref-29">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.cdc.gov/niosh/npg/npgd0518.html">"CDC – NIOSH Pocket Guide to Chemical Hazards – Plaster of Paris"</a>. <i>www.cdc.gov</i><span class="reference-accessdate">. Retrieved <span class="nowrap">21 November</span> 2015</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.cdc.gov&rft.atitle=CDC+%E2%80%93+NIOSH+Pocket+Guide+to+Chemical+Hazards+%E2%80%93+Plaster+of+Paris&rft_id=https%3A%2F%2Fwww.cdc.gov%2Fniosh%2Fnpg%2Fnpgd0518.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3APlaster" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Plaster&action=edit&section=21" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1235681985">.mw-parser-output .side-box{margin:4px 0;box-sizing:border-box;border:1px solid #aaa;font-size:88%;line-height:1.25em;background-color:var(--background-color-interactive-subtle,#f8f9fa);display:flow-root}.mw-parser-output .side-box-abovebelow,.mw-parser-output .side-box-text{padding:0.25em 0.9em}.mw-parser-output .side-box-image{padding:2px 0 2px 0.9em;text-align:center}.mw-parser-output .side-box-imageright{padding:2px 0.9em 2px 0;text-align:center}@media(min-width:500px){.mw-parser-output .side-box-flex{display:flex;align-items:center}.mw-parser-output .side-box-text{flex:1;min-width:0}}@media(min-width:720px){.mw-parser-output .side-box{width:238px}.mw-parser-output .side-box-right{clear:right;float:right;margin-left:1em}.mw-parser-output .side-box-left{margin-right:1em}}</style><style data-mw-deduplicate="TemplateStyles:r1237033735">@media print{body.ns-0 .mw-parser-output .sistersitebox{display:none!important}}@media screen{html.skin-theme-clientpref-night .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .sistersitebox img[src*="Wiktionary-logo-en-v2.svg"]{background-color:white}}</style><div class="side-box side-box-right plainlinks sistersitebox"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style> <div class="side-box-flex"> <div class="side-box-image"><span class="noviewer" typeof="mw:File"><a href="/wiki/File:Wiktionary-logo-en-v2.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/40px-Wiktionary-logo-en-v2.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/60px-Wiktionary-logo-en-v2.svg.png 1.5x, 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src="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/40px-Wiktionary-logo-en-v2.svg.png" decoding="async" width="40" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/60px-Wiktionary-logo-en-v2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/99/Wiktionary-logo-en-v2.svg/80px-Wiktionary-logo-en-v2.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span></div> <div class="side-box-text plainlist">Look up <i><b><a href="https://en.wiktionary.org/wiki/plaster_of_Paris" class="extiw" title="wiktionary:plaster of Paris">plaster of Paris</a></b></i> in Wiktionary, the free dictionary.</div></div> </div> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output 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