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.