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 Media
The generalised chemical structure of polyisocyanurate showing the isocyanurate group. The polyols are abbreviated as R-groups.
Polyisocyanurate (PIR) board fire testing
References
- ↑ Building Science Corporation. Guide to Insulating Sheathing (January 2007). p. 6.[dead link]