Polyisocyanurate Polyisocyanurate, also referred to as PIR, polyiso, or ISO, is a thermoset plastic[1] typically produced as a foam and used as rigid thermal insulation. Its chemistry 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 formulations also differ from those used in PUR. Manufacturing[edit] The reaction of MDI and polyol takes place at higher temperatures compared to the reaction temperature for the manufacture of PUR. PIR typically has an MDI/polyol ratio, also called its index (based on isocyanate/polyol stoichiometry to produce urethane alone), higher than 180. Uses[edit] Polyisocyanurate insulation boards PIR is typically produced as a foam and used as rigid thermal insulation. Effectiveness of the insulation of a building envelope can be compromised by gaps resulting from shrinkage of individual panels.
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