DPDM-400 HIGH TEMPERATURE BATH FLUID is a clear, colorless and odorless Diphenyl-Dimethylsiloxane (CAS# 68083-14-7) with a viscosity of 400cSt. It remains stable at 250°C (open system) for 1,500 to 2,000 hours without gelling or breaking down. In closed system baths*, DPDM-400 HIGH TEMPERATURE BATH FLUID remains stable at 300°C.