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SR-550 is polymeric MDI, generally used in manufacturing rigid pu foam and polyisocyanurate(PIR) foam. Cosmonate SR-550 is solvent-free form with high functionality of 2.8∼2.9 and minimum of 450 cps (25℃) viscosity.
Especially, Cosmoante SR-550 can improve the dimentional stabilities of foam and the flame retardancy of foam, which has a higher functionality.