Kalrez's a registered trademark of DuPont Performance Elastomers L.L.C.(DPE). These parts are based on perfluoroelastomeric material which's compounded and moulded into O-rings, gaskets, and speciality parts. Kalrez has excellent resistance to temperature and chemicals, some grades have a maximum continuous service temperature of 327°C. Perfluoroelastomer (FFKM) O-rings and gaskets are generally used in applications of aromatic hydrocarbons and in highly corrosive fluids and can generally w… (More on Kalrez)