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By certification 
DSU-4110, DSU-450M-- used for common rigid foams, refrigerator, cold-cabinet, and sandwich panels, synthetic wood.
DSU-4110 colour<9, OH value 435-465, water content<0.1, Viscosity 4500-6000, PH 10-13.
DSU-450M colour<8, OH value 435-465, water content<0.1, Viscosity 2500-6500, PH 4.
DSU-4110 colour<9, OH value 435-465, water content<0.1, Viscosity 4500-6000, PH 10-13.
DSU-450M colour<8, OH value 435-465, water content<0.1, Viscosity 2500-6500, PH 4.
