... polyurethane seal ring is made from 100% polyurethane rubber,which has tremendous resistance to temperature extremes,temperatures ... -50, do not destroy its physical and electrical properties,retains a far higher tensile strength, ultimate elongation, ... 35 g/cm33.Hardness:Shore A 60-754.Application:automotive rubber seals,Chemical processing equipment, pumps, mixers, agitators, blenders, pharmaceutical ...