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Available in 41 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-41" 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">41 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%85%D8%B9%D9%8A%D8%A7%D8%B1_%D8%A7%D9%84%D8%B1%D8%A7%D8%A8%D8%B7%D8%A9_%D8%A7%D9%84%D9%88%D8%B7%D9%86%D9%8A%D8%A9_%D9%84%D9%84%D9%88%D9%82%D8%A7%D9%8A%D8%A9_%D9%85%D9%86_%D8%A7%D9%84%D8%AD%D8%B1%D8%A7%D8%A6%D9%82_%D8%B1%D9%82%D9%85_704" title="معيار الرابطة الوطنية للوقاية من الحرائق رقم 704 – Arabic" lang="ar" hreflang="ar" data-title="معيار الرابطة الوطنية للوقاية من الحرائق رقم 704" data-language-autonym="العربية" data-language-local-name="Arabic" class="interlanguage-link-target"><span>العربية</span></a></li><li class="interlanguage-link interwiki-az mw-list-item"><a href="https://az.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Azerbaijani" lang="az" hreflang="az" data-title="NFPA 704" data-language-autonym="Azərbaycanca" data-language-local-name="Azerbaijani" class="interlanguage-link-target"><span>Azərbaycanca</span></a></li><li class="interlanguage-link interwiki-bg mw-list-item"><a href="https://bg.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Bulgarian" lang="bg" hreflang="bg" data-title="NFPA 704" data-language-autonym="Български" data-language-local-name="Bulgarian" class="interlanguage-link-target"><span>Български</span></a></li><li class="interlanguage-link interwiki-bs mw-list-item"><a href="https://bs.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Bosnian" lang="bs" hreflang="bs" data-title="NFPA 704" data-language-autonym="Bosanski" data-language-local-name="Bosnian" class="interlanguage-link-target"><span>Bosanski</span></a></li><li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Catalan" lang="ca" hreflang="ca" data-title="NFPA 704" 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/NFPA_704" title="NFPA 704 – Czech" lang="cs" hreflang="cs" data-title="NFPA 704" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-da mw-list-item"><a href="https://da.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Danish" lang="da" hreflang="da" data-title="NFPA 704" data-language-autonym="Dansk" data-language-local-name="Danish" class="interlanguage-link-target"><span>Dansk</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Gefahrendiamant" title="Gefahrendiamant – German" lang="de" hreflang="de" data-title="Gefahrendiamant" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-el mw-list-item"><a href="https://el.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Greek" lang="el" hreflang="el" data-title="NFPA 704" 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/NFPA_704" title="NFPA 704 – Spanish" lang="es" hreflang="es" data-title="NFPA 704" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%84%D9%88%D8%B2%DB%8C_%D8%A2%D8%AA%D8%B4" title="لوزی آتش – Persian" lang="fa" hreflang="fa" data-title="لوزی آتش" 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/NFPA_704" title="NFPA 704 – French" lang="fr" hreflang="fr" data-title="NFPA 704" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Korean" lang="ko" hreflang="ko" data-title="NFPA 704" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-hr mw-list-item"><a href="https://hr.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Croatian" lang="hr" hreflang="hr" data-title="NFPA 704" 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/NFPA_704" title="NFPA 704 – Indonesian" lang="id" hreflang="id" data-title="NFPA 704" 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/NFPA_704" title="NFPA 704 – Italian" lang="it" hreflang="it" data-title="NFPA 704" 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/NFPA_704" title="NFPA 704 – Hebrew" lang="he" hreflang="he" data-title="NFPA 704" data-language-autonym="עברית" data-language-local-name="Hebrew" class="interlanguage-link-target"><span>עברית</span></a></li><li class="interlanguage-link interwiki-ka mw-list-item"><a href="https://ka.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Georgian" lang="ka" hreflang="ka" data-title="NFPA 704" data-language-autonym="ქართული" data-language-local-name="Georgian" class="interlanguage-link-target"><span>ქართული</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Lithuanian" lang="lt" hreflang="lt" data-title="NFPA 704" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-hu mw-list-item"><a href="https://hu.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Hungarian" lang="hu" hreflang="hu" data-title="NFPA 704" data-language-autonym="Magyar" data-language-local-name="Hungarian" class="interlanguage-link-target"><span>Magyar</span></a></li><li class="interlanguage-link interwiki-mk mw-list-item"><a href="https://mk.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Macedonian" lang="mk" hreflang="mk" data-title="NFPA 704" data-language-autonym="Македонски" data-language-local-name="Macedonian" class="interlanguage-link-target"><span>Македонски</span></a></li><li class="interlanguage-link interwiki-ms mw-list-item"><a href="https://ms.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Malay" lang="ms" hreflang="ms" data-title="NFPA 704" 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/NFPA_704" title="NFPA 704 – Dutch" lang="nl" hreflang="nl" data-title="NFPA 704" 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/NFPA_704" title="NFPA 704 – Japanese" lang="ja" hreflang="ja" data-title="NFPA 704" 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-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Polish" lang="pl" hreflang="pl" data-title="NFPA 704" 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/Diagrama_de_Hommel" title="Diagrama de Hommel – Portuguese" lang="pt" hreflang="pt" data-title="Diagrama de Hommel" 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/NFPA_704" title="NFPA 704 – Romanian" lang="ro" hreflang="ro" data-title="NFPA 704" 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/NFPA_704" title="NFPA 704 – Russian" lang="ru" hreflang="ru" data-title="NFPA 704" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-simple mw-list-item"><a href="https://simple.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Simple English" lang="en-simple" hreflang="en-simple" data-title="NFPA 704" data-language-autonym="Simple English" data-language-local-name="Simple English" class="interlanguage-link-target"><span>Simple English</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Slovak" lang="sk" hreflang="sk" data-title="NFPA 704" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-sl mw-list-item"><a href="https://sl.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Slovenian" lang="sl" hreflang="sl" data-title="NFPA 704" data-language-autonym="Slovenščina" data-language-local-name="Slovenian" class="interlanguage-link-target"><span>Slovenščina</span></a></li><li class="interlanguage-link interwiki-sr mw-list-item"><a href="https://sr.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Serbian" lang="sr" hreflang="sr" data-title="NFPA 704" data-language-autonym="Српски / srpski" data-language-local-name="Serbian" class="interlanguage-link-target"><span>Српски / srpski</span></a></li><li class="interlanguage-link interwiki-sh mw-list-item"><a href="https://sh.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Serbo-Croatian" lang="sh" hreflang="sh" data-title="NFPA 704" data-language-autonym="Srpskohrvatski / српскохрватски" data-language-local-name="Serbo-Croatian" class="interlanguage-link-target"><span>Srpskohrvatski / српскохрватски</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Finnish" lang="fi" hreflang="fi" data-title="NFPA 704" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Swedish" lang="sv" hreflang="sv" data-title="NFPA 704" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-ta mw-list-item"><a href="https://ta.wikipedia.org/wiki/%E0%AE%8E%E0%AE%A9%E0%AF%8D.%E0%AE%8E%E0%AE%AA%E0%AF%8D.%E0%AE%AA%E0%AE%BF.%E0%AE%8F_704" title="என்.எப்.பி.ஏ 704 – Tamil" lang="ta" hreflang="ta" data-title="என்.எப்.பி.ஏ 704" data-language-autonym="தமிழ்" data-language-local-name="Tamil" class="interlanguage-link-target"><span>தமிழ்</span></a></li><li class="interlanguage-link interwiki-th mw-list-item"><a href="https://th.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Thai" lang="th" hreflang="th" data-title="NFPA 704" data-language-autonym="ไทย" data-language-local-name="Thai" class="interlanguage-link-target"><span>ไทย</span></a></li><li class="interlanguage-link interwiki-tr mw-list-item"><a href="https://tr.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Turkish" lang="tr" hreflang="tr" data-title="NFPA 704" data-language-autonym="Türkçe" data-language-local-name="Turkish" class="interlanguage-link-target"><span>Türkçe</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Ukrainian" lang="uk" hreflang="uk" data-title="NFPA 704" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Vietnamese" lang="vi" hreflang="vi" data-title="NFPA 704" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/NFPA_704" title="NFPA 704 – Chinese" lang="zh" hreflang="zh" data-title="NFPA 704" 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<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">Hazard symbol used by emergency personnel to identify the risks posed by hazardous materials</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox" style="width: 12em;"><tbody><tr><th colspan="2" class="infobox-above" style="background:#FFCB66; font-size: 98%;"><a class="mw-selflink selflink">NFPA 704</a><br /><i>safety square</i></th></tr><tr><td colspan="2" class="infobox-image"><style data-mw-deduplicate="TemplateStyles:r1170367383">.mw-parser-output .nfpa-704-diamond-ref{float:right;padding:1px;text-align:right}.mw-parser-output .nfpa-704-diamond-container{width:82px;font-family:sans-serif;margin:0 auto}.mw-parser-output .nfpa-704-diamond-container-ref{float:left;margin-left:1em}.mw-parser-output .nfpa-704-diamond-images{float:left;font-size:20px;text-align:center;position:relative;height:80px;width:80px;padding:1px}.mw-parser-output .nfpa-704-diamond-map{position:absolute;height:80px;width:80px}.mw-parser-output .nfpa-704-diamond .noresize{margin:0 auto}.mw-parser-output .nfpa-704-diamond-code{line-height:1em;text-align:center;position:absolute}.mw-parser-output .nfpa-704-diamond-code>a{color:black}.mw-parser-output .nfpa-704-diamond-blue{width:13px;top:31px;left:15px}.mw-parser-output .nfpa-704-diamond-red{width:12px;top:12px;left:35px}.mw-parser-output .nfpa-704-diamond-yellow{width:13px;top:31px;left:54px}.mw-parser-output .nfpa-704-diamond-white-image{position:relative;top:51px;left:0}.mw-parser-output .nfpa-704-diamond-white-text{vertical-align:middle;text-align:center;line-height:80%;position:absolute;top:52px}.mw-parser-output .nfpa-704-diamond-white-text a>span{position:absolute;color:black}.mw-parser-output .nfpa-704-diamond-white-wors{font-size:15px;width:23px;left:29px}.mw-parser-output .nfpa-704-diamond-white-wox{font-size:15px;font-stretch:condensed;width:21px;line-height:80%;top:-4px;left:29px}.mw-parser-output .nfpa-704-diamond-white-abcp{font-size:13.5px;font-stretch:condensed;width:28px;left:26px}.mw-parser-output .nfpa-704-diamond-white-ac{font-size:10px;width:30px;left:25px}.mw-parser-output .nfpa-704-diamond-white-strike{text-decoration:line-through}</style><div class="nfpa-704-diamond notheme"><div class="nfpa-704-diamond-container"><div class="nfpa-704-diamond-images nounderlines"> <div class="nfpa-704-diamond-map"><figure class="noresize" typeof="mw:File"><span><img alt="NFPA 704 four-colored diamond" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/80px-NFPA_704.svg.png" decoding="async" width="80" height="80" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/120px-NFPA_704.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/6f/NFPA_704.svg/160px-NFPA_704.svg.png 2x" data-file-width="512" data-file-height="512" usemap="#ImageMap_681e978f04c514c6" /></span><map name="ImageMap_681e978f04c514c6"><area href="/wiki/NFPA_704#Blue" shape="poly" coords="23,23,47,47,23,70,0,47" alt="Health 4: Very short exposure could cause death or major residual injury. E.g. VX gas" title="Health 4: Very short exposure could cause death or major residual injury. E.g. VX gas" /><area href="/wiki/NFPA_704#Red" shape="poly" coords="47,0,70,23,47,47,23,23" alt="Flammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propane" title="Flammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propane" /><area href="/wiki/NFPA_704#Yellow" shape="poly" coords="70,23,94,47,70,70,47,47" alt="Instability 4: Readily capable of detonation or explosive decomposition at normal temperatures and pressures. E.g. nitroglycerin" title="Instability 4: Readily capable of detonation or explosive decomposition at normal temperatures and pressures. E.g. nitroglycerin" /><area href="/wiki/NFPA_704#White" shape="poly" coords="47,47,70,70,47,94,23,70" alt="Special hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid" title="Special hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid" /></map><figcaption></figcaption></figure></div><div class="nfpa-704-diamond-code nfpa-704-diamond-blue"> <a class="mw-selflink-fragment" href="#Blue"><span title="Health 4: Very short exposure could cause death or major residual injury. E.g. VX gas" class="notheme mw-no-invert">4</span></a></div><div class="nfpa-704-diamond-code nfpa-704-diamond-red"> <a class="mw-selflink-fragment" href="#Red"><span title="Flammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propane" class="notheme mw-no-invert">4</span></a></div><div class="nfpa-704-diamond-code nfpa-704-diamond-yellow"> <a class="mw-selflink-fragment" href="#Yellow"><span title="Instability 4: Readily capable of detonation or explosive decomposition at normal temperatures and pressures. E.g. nitroglycerin" class="notheme mw-no-invert">4</span></a></div><div class="nfpa-704-diamond-white-text mw-no-invert"><a class="mw-selflink-fragment" href="#White"><span class="nfpa-704-diamond-white-wors" title="Special hazard W: Reacts with water in an unusual or dangerous manner. E.g. sodium, sulfuric acid"><span class="nfpa-704-diamond-white-strike">W</span></span></a></div></div></div></div></td></tr></tbody></table><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-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" 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 article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/NFPA_704" title="Special:EditPage/NFPA 704">improve this article</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 removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22NFPA+704%22">"NFPA 704"</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22NFPA+704%22+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22NFPA+704%22&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22NFPA+704%22+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22NFPA+704%22">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22NFPA+704%22&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">April 2024</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:Nalgene_bottles.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Nalgene_bottles.jpg/220px-Nalgene_bottles.jpg" decoding="async" width="220" height="245" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Nalgene_bottles.jpg/330px-Nalgene_bottles.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Nalgene_bottles.jpg/440px-Nalgene_bottles.jpg 2x" data-file-width="1944" data-file-height="2169" /></a><figcaption>NFPA 704 safety squares on containers of <a href="/wiki/Ethyl_alcohol" class="mw-redirect" title="Ethyl alcohol">ethyl alcohol</a> and <a href="/wiki/Acetone" title="Acetone">acetone</a>.</figcaption></figure> <p>"<b>NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response</b>" is a standard maintained by the <a href="/wiki/United_States" title="United States">U.S.</a>-based <a href="/wiki/National_Fire_Protection_Association" title="National Fire Protection Association">National Fire Protection Association</a>. First "tentatively adopted as a guide" in 1960,<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> and revised several times since then, it defines the "<b>Safety Square</b>" or "<b>Fire Diamond</b>" which is used to quickly and easily identify the risks posed by hazardous materials. This helps determine what, if any, special equipment should be used, procedures followed, or precautions taken during the initial stages of an emergency response. It is an internationally accepted safety standard, and is crucial while transporting <a href="/wiki/Chemicals" class="mw-redirect" title="Chemicals">chemicals</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Codes">Codes<span class="anchor" id="Symbolism"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=NFPA_704&action=edit&section=1" title="Edit section: Codes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-halign-left" typeof="mw:File/Thumb"><a href="/wiki/File:NFPA-704-diamond-standard.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/NFPA-704-diamond-standard.svg/250px-NFPA-704-diamond-standard.svg.png" decoding="async" width="250" height="225" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a2/NFPA-704-diamond-standard.svg/375px-NFPA-704-diamond-standard.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a2/NFPA-704-diamond-standard.svg/500px-NFPA-704-diamond-standard.svg.png 2x" data-file-width="512" data-file-height="460" /></a><figcaption>Standard System for the Identification of the Hazards of Materials for Emergency Response</figcaption></figure> <p>The four divisions are typically color-coded with red on top indicating <a href="/wiki/Flammability" class="mw-redirect" title="Flammability">flammability</a>, blue on the left indicating level of <a href="/wiki/Health_hazard" class="mw-redirect" title="Health hazard">health hazard</a>, yellow on the right for <a href="/wiki/Reactivity_(chemistry)" title="Reactivity (chemistry)">chemical reactivity</a>, and white containing codes for special hazards. Each of health, flammability and reactivity is rated on a scale from 0 (no hazard) to 4 (severe hazard). The latest version of NFPA 704 sections 5, 6, 7 and 8 for the specifications of each classification are listed below. The numeric values in the first column are designated in the standard by "Degree of Hazard" using <a href="/wiki/Arabic_numerals" title="Arabic numerals">Arabic numerals</a> (0, 1, 2, 3, 4), not to be confused with other classification systems, such as that in the NFPA 30 Flammable and Combustible Liquids Code, where flammable and combustible liquid categories are designated by "Class", using <a href="/wiki/Roman_numerals" title="Roman numerals">Roman numerals</a> (I, II, III).<sup id="cite_ref-NFPA_2-0" class="reference"><a href="#cite_note-NFPA-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> <span class="anchor" id="Red"></span> </p> <table class="wikitable" style="width:100%; vertical-align:center;"> <tbody><tr> <th colspan="2" style="color:white; background:red; width:75%;"><big>Flammability (red)</big> </th></tr> <tr> <th style="max-width:10em"><big>0</big> </th> <td>Materials that will not burn under typical fire conditions (e.g., <a href="/wiki/Carbon_tetrachloride" title="Carbon tetrachloride">carbon tetrachloride</a>, <a href="/wiki/Silicon_dioxide" title="Silicon dioxide">silicon dioxide</a>, <a href="/wiki/Perfluorohexane" title="Perfluorohexane">perfluorohexane</a>, <a href="/wiki/Water" title="Water">water</a>), including intrinsically noncombustible materials such as concrete, stone, and sand. Materials that will not burn in air unless exposed to a temperature of 820 °C (1,500 °F) for more than 5 minutes. </td></tr> <tr> <th><big>1</big> </th> <td>Materials that require considerable preheating, under all ambient temperature conditions, before ignition and combustion can occur (e.g., <a href="/wiki/Mineral_oil" title="Mineral oil">mineral oil</a>, <a href="/wiki/Ammonia" title="Ammonia">ammonia</a>, <a href="/wiki/Ethylene_glycol" title="Ethylene glycol">ethylene glycol</a>). Includes some finely divided suspended solids that do not require heating before ignition can occur. <a href="/wiki/Flash_point" title="Flash point">Flash point</a> at or above 93.3 °C (200 °F). </td></tr> <tr> <th><big>2</big> </th> <td>Must be moderately heated or exposed to relatively high ambient temperature before ignition can occur (e.g., <a href="/wiki/Diesel_fuel" title="Diesel fuel">diesel fuel</a>, <a href="/wiki/Paper" title="Paper">paper</a>, <a href="/wiki/Sulfur" title="Sulfur">sulfur</a> and multiple finely divided suspended solids that do not require heating before ignition can occur). Flash point between 37.8 and 93.3 °C (100 and 200 °F). </td></tr> <tr> <th><big>3</big> </th> <td>Liquids and solids (including finely divided suspended solids) that can be ignited under almost all ambient temperature conditions (e.g., <a href="/wiki/Acetone" title="Acetone">acetone</a>, <a href="/wiki/Ethanol" title="Ethanol">ethanol</a>). Liquids having a flash point below 22.8 °C (73 °F) and having a boiling point at or above 37.8 °C (100 °F) or having a flash point between 22.8 and 37.8 °C (73 and 100 °F). </td></tr> <tr> <th><big>4</big> </th> <td>Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily (e.g., <a href="/wiki/Gasoline" title="Gasoline">gasoline</a>, <a href="/wiki/Acetylene" title="Acetylene">acetylene</a>, <a href="/wiki/Propane" title="Propane">propane</a>, <a href="/wiki/Hydrogen_gas" class="mw-redirect" title="Hydrogen gas">hydrogen gas</a>, <a href="/wiki/Diborane" title="Diborane">diborane</a>). Includes <a href="/wiki/Pyrophoricity" title="Pyrophoricity">pyrophoric</a> substances. Flash point below room temperature at 22.8 °C (73 °F). </td></tr></tbody></table> <p><span class="anchor" id="Blue"></span> </p> <table class="wikitable" style="width:100%; vertical-align:center;"> <tbody><tr> <th colspan="2" style="color:white; background:blue; width:75%;"><big>Health (blue)</big> </th></tr> <tr> <th style="max-width:10em"><big>0</big> </th> <td>Poses no health hazard, requires no precautions, and would offer no hazard beyond that of ordinary combustible materials (e.g., <a href="/wiki/Wood" title="Wood">wood</a>, <a href="/wiki/Sugar" title="Sugar">sugar</a>, <a href="/wiki/Salt" title="Salt">salt</a>, <a href="/wiki/Propylene_glycol" title="Propylene glycol">propylene glycol</a>) </td></tr> <tr> <th><big>1</big> </th> <td>Exposure would cause irritation with only minor residual injury (e.g., <a href="/wiki/Acetone" title="Acetone">acetone</a>, <a href="/wiki/Sodium_bromate" title="Sodium bromate">sodium bromate</a>, <a href="/wiki/Potassium_chloride" title="Potassium chloride">potassium chloride</a>) </td></tr> <tr> <th><big>2</big> </th> <td>Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury (e.g., <a href="/wiki/Diethyl_ether" title="Diethyl ether">diethyl ether</a>, <a href="/wiki/Ammonium_phosphate" title="Ammonium phosphate">ammonium phosphate</a>, <a href="/wiki/Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a>, <a href="/wiki/Chloroform" title="Chloroform">chloroform</a>, <a href="/wiki/DEET" title="DEET">DEET</a>). </td></tr> <tr> <th><big>3</big> </th> <td>Short exposure could cause serious temporary or moderate residual injury (e.g., <a href="/wiki/Liquid_hydrogen" title="Liquid hydrogen">liquid hydrogen</a>, <a href="/wiki/Sulfuric_acid" title="Sulfuric acid">sulfuric acid</a>, <a href="/wiki/Calcium_hypochlorite" title="Calcium hypochlorite">calcium hypochlorite</a>, <a href="/wiki/Carbon_monoxide" title="Carbon monoxide">carbon monoxide</a>, <a href="/wiki/Hexafluorosilicic_acid" title="Hexafluorosilicic acid">hexafluorosilicic acid</a>, <a href="/wiki/Zinc_chloride" title="Zinc chloride">zinc chloride</a>, <a href="/wiki/Sodium_hydroxide" title="Sodium hydroxide">sodium hydroxide</a>) </td></tr> <tr> <th><big>4</big> </th> <td>Very short exposure could cause death or major residual injury (e.g. <a href="/wiki/Aluminum_phosphide" class="mw-redirect" title="Aluminum phosphide">aluminum phosphide</a>, <a href="/wiki/Hydrogen_cyanide" title="Hydrogen cyanide">hydrogen cyanide</a>, <a href="/wiki/Phosgene" title="Phosgene">phosgene</a>, <a href="/wiki/Diborane" title="Diborane">diborane</a>, <a href="/wiki/Methyl_isocyanate" title="Methyl isocyanate">methyl isocyanate</a>, <a href="/wiki/Hydrofluoric_acid" title="Hydrofluoric acid">hydrofluoric acid</a>, <a href="/wiki/Sarin" title="Sarin">sarin</a>, <a href="/wiki/Mustard_gas" title="Mustard gas">mustard gas</a>) </td></tr></tbody></table> <p><span class="anchor" id="Yellow"></span> <span class="anchor" id="Blue"></span> </p> <table class="wikitable" style="width:100%; vertical-align:center;"> <tbody><tr> <th colspan="2" style="color:black; background:yellow; width:75%;"><big>Instability–reactivity (yellow)</big> </th></tr> <tr> <th style="max-width:10em"><big>0</big> </th> <td>Normally stable, even under fire exposure conditions, and is not reactive with water (e.g., <a href="/wiki/Helium" title="Helium">helium</a>, <a href="/wiki/Nitrogen" title="Nitrogen">N<sub>2</sub></a>, <a href="/wiki/Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a>) </td></tr> <tr> <th><big>1</big> </th> <td>Normally stable, but can become unstable at elevated temperatures and pressures (e.g., <a href="/wiki/Propene" class="mw-redirect" title="Propene">propene</a>, <a href="/wiki/Ammonium_acetate" title="Ammonium acetate">ammonium acetate</a>, <a href="/wiki/Carbonic_acid" title="Carbonic acid">carbonic acid</a>) </td></tr> <tr> <th><big>2</big> </th> <td>Undergoes violent chemical change at elevated temperatures and pressures, reacts violently with water, or may form explosive mixtures with water (e.g., <a href="/wiki/White_phosphorus" title="White phosphorus">white phosphorus</a>, <a href="/wiki/Potassium" title="Potassium">potassium</a>, <a href="/wiki/Sodium" title="Sodium">sodium</a>) </td></tr> <tr> <th><big>3</big> </th> <td>Capable of detonation or explosive decomposition but requires a strong initiating source, must be heated under confinement before initiation, reacts explosively with water, or will detonate if severely shocked (e.g., <a href="/wiki/Ammonium_nitrate" title="Ammonium nitrate">ammonium nitrate</a>, <a href="/wiki/Caesium" title="Caesium">caesium</a>, <a href="/wiki/Hydrogen_peroxide" title="Hydrogen peroxide">hydrogen peroxide</a>) </td></tr> <tr> <th><big>4</big> </th> <td>Readily capable of <a href="/wiki/Detonation" title="Detonation">detonation</a> or <a href="/wiki/Explosive_material#Chemical_explosives" class="mw-redirect" title="Explosive material">explosive decomposition</a> at normal temperatures and pressures (e.g., <a href="/wiki/Nitroglycerin" title="Nitroglycerin">nitroglycerin</a>, <a href="/wiki/Chlorine_dioxide" title="Chlorine dioxide">chlorine dioxide</a>, <a href="/wiki/Nitrogen_triiodide" title="Nitrogen triiodide">nitrogen triiodide</a>, <a href="/wiki/Manganese_heptoxide" title="Manganese heptoxide">manganese heptoxide</a>, <a href="/wiki/TNT" title="TNT">TNT</a>, <a href="/wiki/Picric_acid" title="Picric acid">Picric acid</a>) </td></tr></tbody></table><p><span class="anchor" id="White"></span> </p><table class="wikitable" style="width:100%; vertical-align:center;"> <tbody><tr> <th colspan="2" style="color:black; background:#ffffff; width:100%;"><big>Special notice (white)</big> </th></tr> <tr> <td colspan="2">The white "special notice" area can contain several symbols. The following symbols are defined by the NFPA 704 standard. </td></tr> <tr> <th style="max-width:10em"><big>OX</big> </th> <td><a href="/wiki/Oxidizer" class="mw-redirect" title="Oxidizer">Oxidizer</a>, allows chemicals to burn without an air supply (e.g., <a href="/wiki/Potassium_perchlorate" title="Potassium perchlorate">potassium perchlorate</a>, <a href="/wiki/Ammonium_nitrate" title="Ammonium nitrate">ammonium nitrate</a>, <a href="/wiki/Hydrogen_peroxide" title="Hydrogen peroxide">hydrogen peroxide</a>). </td></tr> <tr> <th><big><s>W</s></big> </th> <td><a href="/wiki/Water-reactive_substances" title="Water-reactive substances">Reacts with water</a> in an unusual or dangerous manner (e.g., <a href="/wiki/Caesium" title="Caesium">caesium</a>, <a href="/wiki/Sodium" title="Sodium">sodium</a>, <a href="/wiki/Diborane" title="Diborane">diborane</a>, <a href="/wiki/Sulfuric_acid" title="Sulfuric acid">sulfuric acid</a>). </td></tr> <tr> <th><big>SA</big> </th> <td>Simple <a href="/wiki/Asphyxiant_gas" title="Asphyxiant gas">asphyxiant gas</a> (specifically <a href="/wiki/Helium" title="Helium">helium</a>, <a href="/wiki/Nitrogen" title="Nitrogen">nitrogen</a>, <a href="/wiki/Neon" title="Neon">neon</a>, <a href="/wiki/Argon" title="Argon">argon</a>, <a href="/wiki/Krypton" title="Krypton">krypton</a>, and <a href="/wiki/Xenon" title="Xenon">xenon</a>). The SA symbol shall also be used for liquified <a href="/wiki/Carbon_dioxide" title="Carbon dioxide">carbon dioxide</a> vapor withdrawal systems and where large quantities of <a href="/wiki/Dry_ice" title="Dry ice">dry ice</a> are used in confined areas.<sup id="cite_ref-NFPA_2-1" class="reference"><a href="#cite_note-NFPA-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </td></tr></tbody></table> <table class="wikitable" style="width:100%; vertical-align:center;"> <tbody><tr> <th colspan="2" style="color:black; background:#ffffff; width:100%;"><big>Non-standard symbols (white)</big> </th></tr> <tr> <td colspan="2">These hazard codes are not part of the NFPA 704 standard, but are occasionally used in an unofficial manner. The use of non-standard codes may be permitted, required or disallowed by the authority having jurisdiction (e.g., fire department).<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </td></tr> <tr> <th><big>—</big> </th> <td>No special notice (the correct format is to leave the white square blank, but sometimes a <a href="/wiki/Dash" title="Dash">dash</a> is used) </td></tr> <tr> <th style="max-width:10em"><big>OXY</big> </th> <td><a href="/wiki/Oxidizer" class="mw-redirect" title="Oxidizer">Oxidizer</a>, allows chemicals to burn without an air supply (the correct symbol is "OX") </td></tr> <tr> <th style="max-width:10em"><big>COR</big> </th> <td rowspan="3"><a href="/wiki/Corrosive" class="mw-redirect" title="Corrosive">Corrosive</a>; strong <a href="/wiki/Acid" title="Acid">acid</a> or <a href="/wiki/Base_(chemistry)" title="Base (chemistry)">base</a> (e.g., <a href="/wiki/Sulfuric_acid" title="Sulfuric acid">sulfuric acid</a>, <a href="/wiki/Potassium_hydroxide" title="Potassium hydroxide">potassium hydroxide</a>) </td></tr> <tr> <th style="max-width:10em"><big>CORR</big> </th></tr> <tr> <th><span typeof="mw:File"><a href="/wiki/File:NBS_1983_-_Corrosion.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/NBS_1983_-_Corrosion.svg/30px-NBS_1983_-_Corrosion.svg.png" decoding="async" width="30" height="30" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/8/8d/NBS_1983_-_Corrosion.svg/45px-NBS_1983_-_Corrosion.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/8/8d/NBS_1983_-_Corrosion.svg/60px-NBS_1983_-_Corrosion.svg.png 2x" data-file-width="509" data-file-height="509" /></a></span> </th></tr> <tr> <th><big>ACID</big> </th> <td><a href="/wiki/Acid" title="Acid">Acid</a> </td></tr> <tr> <th><big>ALK</big> </th> <td><a href="/wiki/Alkaline" class="mw-redirect" title="Alkaline">Alkaline</a> </td></tr> <tr> <th><big>BIO</big> </th> <td rowspan="2"><a href="/wiki/Biological_hazard" title="Biological hazard">Biological hazard</a> (e.g., <a href="/wiki/Flu_virus" class="mw-redirect" title="Flu virus">flu virus</a>, <a href="/wiki/Rabies_virus" title="Rabies virus">rabies virus</a>) </td></tr> <tr> <th><span typeof="mw:File"><a href="/wiki/File:Biohazard_symbol.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Biohazard_symbol.svg/18px-Biohazard_symbol.svg.png" decoding="async" width="18" height="18" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Biohazard_symbol.svg/27px-Biohazard_symbol.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c0/Biohazard_symbol.svg/36px-Biohazard_symbol.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span> </th></tr> <tr> <th><big>POI</big> </th> <td rowspan="2"><a href="/wiki/Poison" title="Poison">Poisonous</a> (e.g., <a href="/wiki/Strychnine" title="Strychnine">strychnine</a>, <a href="/wiki/Alpha-Amanitin" class="mw-redirect" title="Alpha-Amanitin">alpha-amanitin</a>) </td></tr> <tr> <th><span typeof="mw:File"><a href="/wiki/File:Skull_%26_crossbones.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Skull_%26_crossbones.svg/20px-Skull_%26_crossbones.svg.png" decoding="async" width="20" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Skull_%26_crossbones.svg/30px-Skull_%26_crossbones.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1c/Skull_%26_crossbones.svg/40px-Skull_%26_crossbones.svg.png 2x" data-file-width="513" data-file-height="495" /></a></span> </th></tr> <tr> <th><big>RA</big> </th> <td rowspan="4"><a href="/wiki/Radioactive_decay" title="Radioactive decay">Radioactive</a> (e.g., <a href="/wiki/Plutonium" title="Plutonium">plutonium</a>, <a href="/wiki/Cobalt-60" title="Cobalt-60">cobalt-60</a>, <a href="/wiki/Carbon-14" title="Carbon-14">carbon-14</a>) </td></tr> <tr> <th><big>RAD</big> </th></tr> <tr> <th><span typeof="mw:File"><a href="/wiki/File:Radiation_warning_symbol2.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Radiation_warning_symbol2.svg/20px-Radiation_warning_symbol2.svg.png" decoding="async" width="20" height="20" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/5/59/Radiation_warning_symbol2.svg/30px-Radiation_warning_symbol2.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/5/59/Radiation_warning_symbol2.svg/40px-Radiation_warning_symbol2.svg.png 2x" data-file-width="512" data-file-height="512" /></a></span> </th></tr> <tr> <th><span typeof="mw:File"><a href="/wiki/File:Radioactive_Red.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Radioactive_Red.svg/20px-Radioactive_Red.svg.png" decoding="async" width="20" height="19" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Radioactive_Red.svg/30px-Radioactive_Red.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/c/c5/Radioactive_Red.svg/40px-Radioactive_Red.svg.png 2x" data-file-width="267" data-file-height="250" /></a></span> </th></tr> <tr> <th><big>CRY</big> </th> <td rowspan="2"><a href="/wiki/Cryogenic" class="mw-redirect" title="Cryogenic">Cryogenic</a> (e.g., <a href="/wiki/Liquid_nitrogen" title="Liquid nitrogen">liquid nitrogen</a>) </td></tr> <tr> <th><big>CRYO</big> </th></tr> <tr> <th><big>G OX</big> </th> <td><a href="/wiki/Oxygen" title="Oxygen">Oxygen</a> gas </td></tr></tbody></table> <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=NFPA_704&action=edit&section=2" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <figure class="mw-default-size" typeof="mw:File/Thumb"><a href="/wiki/File:NFPA_704_label_of_hydrofluosilicic_acid.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/NFPA_704_label_of_hydrofluosilicic_acid.jpg/220px-NFPA_704_label_of_hydrofluosilicic_acid.jpg" decoding="async" width="220" height="155" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/da/NFPA_704_label_of_hydrofluosilicic_acid.jpg/330px-NFPA_704_label_of_hydrofluosilicic_acid.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/da/NFPA_704_label_of_hydrofluosilicic_acid.jpg/440px-NFPA_704_label_of_hydrofluosilicic_acid.jpg 2x" data-file-width="1095" data-file-height="771" /></a><figcaption>"Fire diamond" of <a href="/wiki/Hydrofluosilicic_acid" class="mw-redirect" title="Hydrofluosilicic acid">hydrofluosilicic acid</a>.</figcaption></figure> <p>The development of NFPA 704 is credited to the <a href="/wiki/Charlotte_Fire_Department" title="Charlotte Fire Department">Charlotte Fire Department</a> after a fire at the Charlotte Chemical Company in 1959 led to severe injuries to many of the firefighters.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> Upon arrival, the fire crew found a fire burning inside a vat that firefighters assumed to be burning kerosene. The crew tried to suppress the fire, which resulted in the vat exploding due to metallic sodium being stored in the kerosene. Thirteen firefighters were injured, several of whom had critical injuries while one lost both ears and most of his face from the incident. </p><p>At the time, such vats were not labelled with the materials they contained, so firefighters did not have the necessary information to recognize that hazardous materials were present, which required a specific response. In this case, sodium was able to react with water to release hydrogen gas and large amounts of heat, which has the potential to explode. </p><p>The Charlotte Fire Department developed training to respond to fires involving hazardous materials, ensured that protective clothing was available to those responding, and expanded the fire prevention inspection program. Fire Marshal J. F. Morris developed the diamond shaped placard as a marking system to indicate when a building contained hazardous materials, with their levels of flammability, reactivity and health effects. <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> </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=NFPA_704&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Globally_Harmonized_System_of_Classification_and_Labeling_of_Chemicals" class="mw-redirect" title="Globally Harmonized System of Classification and Labeling of Chemicals">Globally Harmonized System of Classification and Labeling of Chemicals</a></li> <li><a href="/wiki/GHS_hazard_pictograms" title="GHS hazard pictograms">GHS hazard pictograms</a></li> <li><a href="/wiki/Hazard_symbol" title="Hazard symbol">Hazard symbol</a></li> <li><a href="/wiki/HMIS_Color_Bar" class="mw-redirect" title="HMIS Color Bar">HMIS Color Bar</a></li> <li><a href="/wiki/Hazchem" title="Hazchem">Hazchem</a></li> <li><a href="/wiki/Dangerous_goods" title="Dangerous goods">Hazmat</a></li></ul> <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=NFPA_704&action=edit&section=4" 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"><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"><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="CITEREFDornetteWoodworth1969" class="citation web cs1">Dornette, W. H. L.; Woodworth, Miles E. (1969). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20160303232503/http://www.nfpa.org/Assets/files/AboutTheCodes/704/TCRF-1975-704M.pdf">"Proposed Amendments on Revisions to the Recommended System for the Identification of The Fire Hazards of Materials / NFPA No. 704M — 1969"</a> <span class="cs1-format">(PDF)</span>. <a href="/wiki/National_Fire_Protection_Association" title="National Fire Protection Association">National Fire Protection Association</a>. Archived from <a rel="nofollow" class="external text" href="https://www.nfpa.org/Assets/files/AboutTheCodes/704/TCRF-1975-704M.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2016-03-03<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-03-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Proposed+Amendments+on+Revisions+to+the+Recommended+System+for+the+Identification+of+The+Fire+Hazards+of+Materials+%2F+NFPA+No.+704M+%E2%80%94+1969&rft.pub=National+Fire+Protection+Association&rft.date=1969&rft.aulast=Dornette&rft.aufirst=W.+H.+L.&rft.au=Woodworth%2C+Miles+E.&rft_id=https%3A%2F%2Fwww.nfpa.org%2FAssets%2Ffiles%2FAboutTheCodes%2F704%2FTCRF-1975-704M.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" class="Z3988"></span></span> </li> <li id="cite_note-NFPA-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-NFPA_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-NFPA_2-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><span class="id-lock-registration" title="Free registration required"><a rel="nofollow" class="external text" href="https://link.nfpa.org/free-access/publications/704/2022">"NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response"</a></span>. 2022.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=NFPA+704%3A+Standard+System+for+the+Identification+of+the+Hazards+of+Materials+for+Emergency+Response&rft.date=2022&rft_id=https%3A%2F%2Flink.nfpa.org%2Ffree-access%2Fpublications%2F704%2F2022&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</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.smithsonianmag.com/arts-culture/decoding-the-city-the-fire-diamond-18494224/">"Decoding the City: The Fire Diamond"</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Decoding+the+City%3A+The+Fire+Diamond&rft_id=https%3A%2F%2Fwww.smithsonianmag.com%2Farts-culture%2Fdecoding-the-city-the-fire-diamond-18494224%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</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://704shop.com/blogs/fact-friday/fact-friday-153-charlottes-haz-mat-history">"Fact Friday 153 - Charlotte's Haz-Mat History"</a>. <i>704 Shop</i>. 22 June 2018<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-02-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=704+Shop&rft.atitle=Fact+Friday+153+-+Charlotte%27s+Haz-Mat+History&rft.date=2018-06-22&rft_id=https%3A%2F%2F704shop.com%2Fblogs%2Ffact-friday%2Ffact-friday-153-charlottes-haz-mat-history&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</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.fox46.com/news/local-news/july-marks-62-years-since-charlotte-fire-invented-haz-mat-safety-measure/">"July marks 62 years since Charlotte Fire invented Haz-Mat safety measure"</a>. <i>Queen City News</i>. 2021-06-28<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-02-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Queen+City+News&rft.atitle=July+marks+62+years+since+Charlotte+Fire+invented+Haz-Mat+safety+measure&rft.date=2021-06-28&rft_id=https%3A%2F%2Fwww.fox46.com%2Fnews%2Flocal-news%2Fjuly-marks-62-years-since-charlotte-fire-invented-haz-mat-safety-measure%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</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://web.archive.org/web/20230407222759/https://charlottenc.gov/Fire/about-us/Documents/CFD%20History%20Final%20Jan%209%202014.pdf">"History of the Charlotte Fire Department"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="https://charlottenc.gov/Fire/about-us/Documents/CFD%20History%20Final%20Jan%209%202014.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2023-04-07<span class="reference-accessdate">. Retrieved <span class="nowrap">2022-02-22</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=History+of+the+Charlotte+Fire+Department&rft_id=https%3A%2F%2Fcharlottenc.gov%2FFire%2Fabout-us%2FDocuments%2FCFD%2520History%2520Final%2520Jan%25209%25202014.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" 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=NFPA_704&action=edit&section=5" 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"><span><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/30px-Commons-logo.svg.png" decoding="async" width="30" height="40" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/45px-Commons-logo.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/4/4a/Commons-logo.svg/59px-Commons-logo.svg.png 2x" data-file-width="1024" data-file-height="1376" /></span></span></div> <div class="side-box-text plainlist">Wikimedia Commons has media related to <span style="font-weight: bold; font-style: italic;"><a href="https://commons.wikimedia.org/wiki/Category:NFPA_704_images" class="extiw" title="commons:Category:NFPA 704 images">NFPA 704 images</a></span>.</div></div> </div> <ul><li><a rel="nofollow" class="external text" href="https://link.nfpa.org/free-access/publications/704/2022">NFPA 704 (2022) Free Access</a> on NFPA.org</li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://archive.today/20170716160209/http://www.nfpa.org/assets/files/aboutthecodes/704/704_faqs.pdf">"Frequently Asked Questions on NFPA 704"</a> <span class="cs1-format">(PDF)</span>. Archived from <a rel="nofollow" class="external text" href="http://www.nfpa.org/Assets/files/AboutTheCodes/704/704_FAQs.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2017-07-16<span class="reference-accessdate">. Retrieved <span class="nowrap">2016-03-04</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Frequently+Asked+Questions+on+NFPA+704&rft_id=http%3A%2F%2Fwww.nfpa.org%2FAssets%2Ffiles%2FAboutTheCodes%2F704%2F704_FAQs.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.milwaukee.gov/ImageLibrary/User/dnscms/pdf/broc/hazmat12.pdf">"Pamphlet produced by the City of Milwaukee summarizing NFPA 704 code requirements"</a> <span class="cs1-format">(PDF)</span>. <a href="/wiki/Milwaukee" title="Milwaukee">City of Milwaukee</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Pamphlet+produced+by+the+City+of+Milwaukee+summarizing+NFPA+704+code+requirements&rft.pub=City+of+Milwaukee&rft_id=http%3A%2F%2Fwww.milwaukee.gov%2FImageLibrary%2FUser%2Fdnscms%2Fpdf%2Fbroc%2Fhazmat12.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" class="Z3988"></span></li> <li><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.osha.gov/dsg/hazcom/index.html">"Hazard Communication"</a>. <a href="/wiki/Occupational_Safety_and_Health_Administration" title="Occupational Safety and Health Administration">Occupational Safety and Health Administration</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Hazard+Communication&rft.pub=Occupational+Safety+and+Health+Administration&rft_id=https%3A%2F%2Fwww.osha.gov%2Fdsg%2Fhazcom%2Findex.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3ANFPA+704" class="Z3988"></span></li> <li><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20150310145104/http://chemlabs.uoregon.edu/Safety/NFPA.html">"Safety in the Chemistry Laboratory: NFPA 704 Hazard Identification System"</a>. <a href="/wiki/University_of_Oregon" title="University of Oregon">University of Oregon</a>. 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