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It does not use elemental <a href="/wiki/Chlorine" title="Chlorine">chlorine</a> gas during the bleaching process and prevents the formation of <a href="/wiki/Dioxins_and_dioxin-like_compounds" title="Dioxins and dioxin-like compounds">dioxins and dioxin-like compounds</a>, <a href="/wiki/Carcinogen" title="Carcinogen">carcinogens</a>. The traditional ECF sequence is DEopDEpD<sup id="cite_ref-Tool_1-0" class="reference"><a href="#cite_note-Tool-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 14">: 14 </span></sup> using the common letter symbols for bleaching stages,<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> though many improved sequences are available.<sup id="cite_ref-Tool_1-1" class="reference"><a href="#cite_note-Tool-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Page / location: 15">: 15 </span></sup> </p><p><a href="/wiki/Totally_chlorine_free" class="mw-redirect" title="Totally chlorine free">Totally chlorine free</a> (TCF) is paper that does not use any chlorine compounds for wood pulp bleaching. </p> <div class="mw-heading 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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 class="citation cs2"><a rel="nofollow" class="external text" href="http://www.paperenvironment.org/PDF/chcompounds/CC_Full_Text.pdf"><i>Different Bleaching Configurations</i></a> <span class="cs1-format">(PDF)</span>, National Council for Air and Stream Improvement, 2009</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Different+Bleaching+Configurations&rft.pub=National+Council+for+Air+and+Stream+Improvement&rft.date=2009&rft_id=http%3A%2F%2Fwww.paperenvironment.org%2FPDF%2Fchcompounds%2FCC_Full_Text.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AElemental+chlorine+free" 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 class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.paperonweb.com/bleach.htm">"PaperOnWeb description of bleaching sequences"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">2007-09-17</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=PaperOnWeb+description+of+bleaching+sequences&rft_id=http%3A%2F%2Fwww.paperonweb.com%2Fbleach.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AElemental+chlorine+free" 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=Elemental_chlorine_free&action=edit&section=3" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20180304041745/http://www.aet.org/epp/brochure_0806.pdf">Alliance for Environmental Technology</a> - <i>ECF: The Sustainable Technology</i></li></ul> <div class="navbox-styles"><style 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.navbox-odd{background-color:transparent}.mw-parser-output .navbox .hlist td dl,.mw-parser-output .navbox .hlist td ol,.mw-parser-output .navbox .hlist td ul,.mw-parser-output .navbox td.hlist dl,.mw-parser-output .navbox td.hlist ol,.mw-parser-output .navbox td.hlist ul{padding:0.125em 0}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em}body.skin--responsive .mw-parser-output .navbox-image img{max-width:none!important}@media print{body.ns-0 .mw-parser-output .navbox{display:none!important}}</style></div><div role="navigation" class="navbox" aria-labelledby="Paper" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><style 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abbr{color:var(--color-base)!important}@media(prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .navbar li a abbr{color:var(--color-base)!important}}@media print{.mw-parser-output .navbar{display:none!important}}</style><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:Paper" title="Template:Paper"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:Paper" title="Template talk:Paper"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:Paper" title="Special:EditPage/Template:Paper"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="Paper" style="font-size:114%;margin:0 4em"><a href="/wiki/Paper" title="Paper">Paper</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><a href="/wiki/Paper_engineering" title="Paper engineering">Paper engineering</a> / <a href="/wiki/Papermaking" title="Papermaking">Papermaking</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/History_of_paper" title="History of paper">History</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Battle_of_Talas" title="Battle of Talas">Battle of Talas</a></li> <li><a href="/wiki/Missal_of_Silos" title="Missal of Silos">Missal of Silos</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="Originators" scope="row" class="navbox-group" style="width:1%">Originators</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Cai_Lun" title="Cai Lun">Cai Lun</a> (Zuo Bo/Tso Po/Tso Tzǔ-yi)</li> <li><a href="/wiki/Damjing" title="Damjing">Damjing</a></li></ul> </div></td></tr></tbody></table><div> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Developers</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Matthias_Koops" title="Matthias Koops">Matthias Koops</a></li> <li><a href="/wiki/Friedrich_Gottlob_Keller" title="Friedrich Gottlob Keller">Friedrich Gottlob Keller</a></li> <li><a href="/wiki/Charles_Fenerty" title="Charles Fenerty">Charles Fenerty</a></li></ul> </div></td></tr></tbody></table><div> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Scholars</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Thomas_Francis_Carter" title="Thomas Francis Carter">Thomas Francis Carter</a></li> <li><a href="/wiki/Dard_Hunter" title="Dard Hunter">Dard Hunter</a></li> <li><a href="/wiki/Tsien_Tsuen-hsuin" title="Tsien Tsuen-hsuin">Tsien Tsuen-hsuin</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Types</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Acid-free_paper" title="Acid-free paper">Acid-free</a></li> <li><a href="/wiki/Air-laid_paper" title="Air-laid paper">Air-laid</a></li> <li><a href="/wiki/Amate" title="Amate">Amate</a></li> <li><a href="/wiki/Bituminous_waterproofing#Roofing_felt" title="Bituminous waterproofing">Asphalt</a></li> <li><a href="/wiki/Banana_paper" title="Banana paper">Banana</a></li> <li><a href="/wiki/Bible_paper" title="Bible paper">Bible</a></li> <li><a href="/wiki/Blotting_paper" title="Blotting paper">Blotting</a></li> <li><a href="/wiki/Bond_paper" title="Bond paper">Bond</a></li> <li><a href="/wiki/Bristol_board" title="Bristol board">Bristol</a></li> <li><a href="/wiki/Carbon_paper" title="Carbon paper">Carbon</a></li> <li><a href="/wiki/Cardboard" title="Cardboard">Cardboard</a></li> <li><a href="/wiki/Card_stock" title="Card stock">Cardstock</a></li> <li><a href="/wiki/Cartridge_paper" title="Cartridge paper">Cartridge</a></li> <li><a href="/wiki/Coated_paper" title="Coated paper">Coated</a></li> <li><a href="/wiki/Construction_paper" title="Construction paper">Construction</a></li> <li><a href="/wiki/Contact_paper" title="Contact paper">Contact</a></li> <li><a href="/wiki/Special_fine_paper#Copy_paper" title="Special fine paper">Copy</a> <ul><li><a href="/wiki/Carbonless_copy_paper" title="Carbonless copy paper">Carbonless</a></li></ul></li> <li><a href="/wiki/Correction_paper" title="Correction paper">Correction</a></li> <li><a href="/wiki/Cotton_paper" title="Cotton paper">Cotton (rag)</a></li> <li><a href="/wiki/Cr%C3%AApe_paper" title="Crêpe paper">Crêpe</a></li> <li><a href="/wiki/Display_board" title="Display board">Display</a></li> <li><a href="/wiki/D%C3%B3_paper" title="Dó paper">Dó</a></li> <li><a href="/wiki/Electrical_insulation_paper" title="Electrical insulation paper">Electrical insulation</a></li> <li><a href="/wiki/Filter_paper" title="Filter paper">Filteration</a></li> <li><a href="/wiki/Genk%C5%8D_y%C5%8Dshi" title="Genkō yōshi">Genkō yōshi</a></li> <li><a href="/wiki/Glassine" title="Glassine">Glassine</a></li> <li><a href="/wiki/Graph_paper" title="Graph paper">Graph</a></li> <li><a href="/wiki/Greaseproof_paper" title="Greaseproof paper">Greaseproof</a></li> <li><a href="/wiki/Hemp_paper" title="Hemp paper">Hemp</a></li> <li><a href="/wiki/India_paper" title="India paper">India</a></li> <li><a href="/wiki/Inkjet_paper" title="Inkjet paper">Inkjet</a></li> <li><a href="/wiki/Ingres_paper" title="Ingres paper">Ingres</a></li> <li><a href="/wiki/Korean_paper" title="Korean paper">Korean</a></li> <li><a href="/wiki/Kraft_paper" title="Kraft paper">Kraft</a> <ul><li><a href="/wiki/Butcher_paper" title="Butcher paper">Butcher</a></li></ul></li> <li><a href="/wiki/Laid_paper" title="Laid paper">Laid</a></li> <li><a href="/wiki/Lokta_paper" title="Lokta paper">Lokta</a></li> <li><a href="/wiki/Manila_paper" title="Manila paper">Manila</a></li> <li><a href="/wiki/Mummy_paper" title="Mummy paper">Mummy</a></li> <li><a href="/wiki/Newsprint" title="Newsprint">Newsprint</a></li> <li><a href="/wiki/Onionskin" title="Onionskin">Onionskin</a></li> <li><a href="/wiki/Origami_paper" title="Origami paper">Origami</a></li> <li><a href="/wiki/Paperboard" title="Paperboard">Paperboard</a></li> <li><a href="/wiki/Parchment_paper" title="Parchment paper">Parchment</a></li> <li><a href="/wiki/Photographic_paper" title="Photographic paper">Photographic</a></li> <li><a href="/wiki/Plastic-coated_paper" class="mw-redirect" title="Plastic-coated paper">Plastic-coated</a></li> <li><a href="/wiki/Red_rosin_paper" class="mw-redirect" title="Red rosin paper">Red rosin</a></li> <li><a href="/wiki/Rice_paper" title="Rice paper">Rice</a></li> <li><a href="/wiki/Rolling_paper" title="Rolling paper">Rolling</a></li> <li><a href="/wiki/Bible_paper" title="Bible paper">Scritta</a></li> <li><a href="/wiki/Security_paper" title="Security paper">Security</a></li> <li><a href="/wiki/Seed_paper" title="Seed paper">Seed</a></li> <li><a href="/wiki/Stone_paper" title="Stone paper">Stone</a></li> <li><a href="/wiki/Tar_paper" title="Tar paper">Tar</a></li> <li><a href="/wiki/Thermal_paper" title="Thermal paper">Thermal</a></li> <li><a href="/wiki/Tissue_paper" title="Tissue paper">Tissue</a></li> <li><a href="/wiki/Tracing_paper" title="Tracing paper">Tracing</a></li> <li><a href="/wiki/Transfer_paper" title="Transfer paper">Transfer</a></li> <li><a href="/wiki/Tree-free_paper" title="Tree-free paper">Tree-free</a></li> <li><a href="/wiki/Wallpaper" title="Wallpaper">Wallpaper</a></li> <li><a href="/wiki/Washi" title="Washi">Washi</a></li> <li><a href="/wiki/Wasli" title="Wasli">Wasli</a></li> <li><a href="/wiki/Waterproof_paper" title="Waterproof paper">Waterproof</a></li> <li><a href="/wiki/Wax_paper" class="mw-redirect" title="Wax paper">Wax</a></li> <li><a href="/wiki/Wood-free_paper" title="Wood-free paper">Wood-free</a></li> <li><a href="/wiki/Wove_paper" title="Wove paper">Wove</a></li> <li><a href="/wiki/Printing_and_writing_paper" title="Printing and writing paper">Writing</a></li> <li><a href="/wiki/Xuan_paper" title="Xuan paper">Xuan</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Materials</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Kaolinite" title="Kaolinite">China clay</a></li> <li><a href="/wiki/Corrugated_fiberboard" title="Corrugated fiberboard">Corrugated fiberboard</a></li> <li><a href="/wiki/Fiber_crop" title="Fiber crop">Fiber crop</a></li> <li><a href="/wiki/Paper_chemicals" title="Paper chemicals">Paper chemicals</a></li> <li><a href="/wiki/Papyrus" title="Papyrus">Papyrus</a></li> <li><a href="/wiki/Pulp_(paper)" title="Pulp (paper)">Wood pulp</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Paper#Types,_thickness_and_weight" title="Paper">Specifications</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Paper_density" title="Paper density">Density</a></li> <li><a href="/wiki/Grammage" title="Grammage">Grammage</a></li> <li><a href="/wiki/Paper_size" title="Paper size">Paper sizes</a></li> <li><a href="/wiki/Surface_chemistry_of_paper" title="Surface chemistry of paper">Surface chemistry of paper</a></li> <li><a href="/wiki/Units_of_paper_quantity" title="Units of paper quantity">Units of paper quantity</a></li> <li><a href="/wiki/Wet_strength" title="Wet strength">Wet strength</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Manufacture<br />and process</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Bleaching_of_wood_pulp" title="Bleaching of wood pulp">Bleaching of wood pulp</a></li> <li><a href="/wiki/Calender" title="Calender">Calender</a></li> <li><a href="/wiki/Conical_refiner" title="Conical refiner">Conical refiner</a></li> <li><a href="/wiki/Deinking" title="Deinking">Deinking</a></li> <li><a class="mw-selflink selflink">Elemental chlorine free</a></li> <li><a href="/wiki/Environmental_impact_of_paper" title="Environmental impact of paper">Environmental impact of paper</a></li> <li><a href="/wiki/Papermaking#Manual_papermaking" title="Papermaking">Handmade paper</a></li> <li><a href="/wiki/Hollander_beater" title="Hollander beater">Hollander beater</a></li> <li><a href="/wiki/Kraft_process" title="Kraft process">Kraft process</a></li> <li><a href="/wiki/Organosolv" title="Organosolv">Organosolv</a></li> <li><a href="/wiki/Paper_machine" title="Paper machine">Paper machine</a></li> <li><a href="/wiki/Paper_recycling" title="Paper recycling">Paper recycling</a></li> <li><a href="/wiki/Papermaking" title="Papermaking">Papermaking</a></li> <li><a href="/wiki/Soda_pulping" title="Soda pulping">Soda pulping</a></li> <li><a href="/wiki/Sulfite_process" title="Sulfite process">Sulfite process</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Industry</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Pulp_and_paper_industry" title="Pulp and paper industry">Paper industry</a> <ul><li><a href="/wiki/Pulp_and_paper_industry_in_Canada" title="Pulp and paper industry in Canada">Canada</a></li> <li><a href="/wiki/Pulp_and_paper_industry_in_Europe" title="Pulp and paper industry in Europe">Europe</a></li> <li><a href="/wiki/Pulp_and_paper_industry_in_India" title="Pulp and paper industry in India">India</a></li> <li><a href="/wiki/Pulp_and_paper_industry_in_Indonesia" title="Pulp and paper industry in Indonesia">Indonesia</a></li> <li><a href="/wiki/Pulp_and_paper_industry_in_Japan" title="Pulp and paper industry in Japan">Japan</a></li> <li><a href="/wiki/Pulp_and_paper_industry_in_the_United_States" title="Pulp and paper industry in the United States">United States</a></li></ul></li> <li><a href="/wiki/Paper_mill" title="Paper mill">Paper mill</a> <ul><li><a href="/wiki/List_of_paper_mills" title="List of paper mills">List</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Uses</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Lined_paper" class="mw-redirect" title="Lined paper">Lined paper</a></li> <li><a href="/wiki/Paper_towel" title="Paper towel">Paper towels</a></li> <li><a href="/wiki/Papier-m%C3%A2ch%C3%A9" title="Papier-mâché">Papier-mâché</a></li> <li><a href="/wiki/Cardboard" title="Cardboard">Cardboard</a></li> <li><a href="/wiki/Paper_clothing" title="Paper clothing">Clothing</a></li> <li><a href="/wiki/Tissue_paper" title="Tissue paper">Tissues</a></li> <li><a href="/wiki/Notebook" title="Notebook">Notebooks</a></li> <li><a href="/wiki/Watercolor_paper" title="Watercolor paper">Watercolor paper</a></li> <li><a href="/wiki/Paper_money" class="mw-redirect" title="Paper money">Paper money</a></li> <li><a href="/wiki/Beverage_carton" class="mw-redirect" title="Beverage carton">Beverage cartons</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2" style="font-weight: bold;"><div> <ul><li><span 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