... The polyurethane seal ring is made from 100% polyurethane rubber,which has tremendous resistance to temperature extremes,temperatures as high ... is best for your choice. 1.Color:black,blue,red,other color,according to your pantone2.Density:1.19-1 ... .35 g/cm33.Hardness:Shore A 60-754.Application:automotive rubber seals,Chemical processing equipment, pumps, mixers, agitators, blenders, pharmaceutical & ...