Polyisocyanurate

Polyisocyanurate is a thermoset plastic.[1] 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 proportion of methylene diphenyl diisocyanate is higher and a polyester-derived polyol is used in the reaction instead of a polyether polyol. Catalysts and additives used are also different from those used in PUR.

Polyisocyanurate insulation boards

References

Building Science Corporation (January 2007). "Guide to Insulating Sheathing" (PDF). p. 6.

Other websites

Polyisocyanurate Insulation Manufacturers Association Archived 2006-02-08 at the Wayback Machine
Polyisocyanurate Insulation energy savings, by Center for the Polyurethanes Industry Archived 2008-09-23 at the Wayback Machine

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[1] Building Science Corporation (January 2007). "Guide to Insulating Sheathing" (PDF). p. 6.