What is Polyisocyanurate?
[[File:PIR Panels 02.JPG|thumb|350 px|Polyisocyanurate insulation boards]] '''Polyisocyanurate''' is a [[thermosetting polymer|thermoset]] plastic.<ref>{{cite web |url=http://www.buildingscience.com/documents/guides-and-manuals/gm-guide-insulating-sheathing/GM_Guide_Insulating_Sheathing.pdf |title=Guide to Insulating Sheathing |date=January 2007 |author=Building Science Corporation |page=6 }}{{Dead link|date=March 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> It is also called '''PIR''', '''polyiso''', or '''ISO'''. It is usually made as a [[foam]]. It is used as rigid [[thermal insulation]]. It is similar to [[polyurethane]] (PUR) except that the [[Proportions|proportion]] of [[methylene diphenyl diisocyanate]] is higher and a [[polyester]]-derived polyol is used in the [[Chemical reaction|reaction]] instead of a [[polyether]] [[polyol]]. [[Catalysis|Catalysts]] and [[Additive|additives]] used are also different from those used in PUR. == References == {{Reflist|2}} ==Other websites== {{commonscat|Polyisocyanurate insulation boards}} *[http://www.pima.org/ Polyisocyanurate Insulation Manufacturers Association] {{Webarchive|url=https://web.archive.org/web/20060208162043/http://www.pima.org/ |date=2006-02-08 }} *[http://www.polyurethane.org/s_api/sec.asp?CID=903&DID=3616 Polyisocyanurate Insulation energy savings, by Center for the Polyurethanes Industry] {{Webarchive|url=https://web.archive.org/web/20080923151823/http://www.polyurethane.org/s_api/sec.asp?CID=903&DID=3616 |date=2008-09-23 }} [[Category:Polymers]]