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 (MDI) is higher and a polyester-derived polyol is used in the reaction instead of a polyether polyol. Catalysts and additives used in PIR is also different from those used in PUR.
Polyisocyanurate Media
The generalised chemical structure of polyisocyanurate showing the isocyanate group. The polyols are abbreviated as R-groups.
Polyisocyanurate (PIR) board fire testing
References
- ↑ Building Science Corporation (January 2007). "Guide to Insulating Sheathing" (PDF). p. 6.[dead link]