Insulating buildings with polyurethane duct boards proves to be a rather efficient way of reducing heat losses which generally happen. One of the procedures to prevent these is polyurethane duct board insulation, that is achieved using polystyrene centered polyurethane center boards or using polyisocyanurate duct board.
The fundamental differences between the 2 would be that the greater percentage of methylene diphenyl diisocyanate contained in polyisocyanurate, and also the simple fact polyisocyanurate is made with a polyol produced out of polyester rather than polyether polyol, as could be true for polyurethane.
Owing to those, the catalyst and additives employed for its creation of polyisocyanurate differs from those found in memory. The creation of PIR is produced by mixing methylene diphenyl diisocyanate and polyol at substantially higher temperatures compared to those used to generate memory.
When reaching those temperatures, even in case certain catalysts are found, methylene diphenyl diisocyanate will react with itself, leading in a ring receptor which functions as an open minded intermediate. Even the methylene diphenyl diisocyanate still stays and also the intermediate responds with all the polyol and transforms into a urethane-isocyanurate polymer.
The sturdy molecular arrangement of this isocyanurate polymer and it has high crosslink contributes to superior stiffness in contrast to similar polyurethanes. This caliber gives polyisocyanurate more sustainable and chemical equilibrium Based upon the proportion of methylene diphenyl diisocyanate into polyol, that may differ from 200 to 500, the duct board may have a vast selection of stiffness, chemical or thermal equilibrium, based on its own purpose of duct board insulation.