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Pc stuff. PLusnet. BIBLE. 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. At these elevated temperatures and in the presence of specific catalysts, MDI will first react with itself, producing a stiff, ring molecule, which is a reactive intermediate (a tri-isocyanate isocyanurate compound). 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] Health hazards[edit] Google.
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