Kalrez® is a perfluoroelastomer compound offering high temperature use and chemical resistance
Compared with other elastomers, Kalrez® is normally more resistant to swelling and embrittlement, and will retain these properties for a longer period of time. Compared with metal seals, Kalrez® is easily installed and conforms to the sealing surface despite irregularities which can occur due to improper assembly or wear. Compared with PTFE seals, Kalrez® is not likely to creep or cold flow.
Kalrez® O-Rings retain their elastic properties in long-term service at temperatures as high as 316°C, and in intermittent service up to 327°C. Generally, Kalrez® provides reliable performance at temperatures up to 83°C (150°F) higher than O-Rings made from other commercial elastomers. They can be used in a wide variety of hot, corrosive environments. Kalrez® is a registered trademark of E.I. Dupont & Co.
It has all the properties and inertness of PTFE. Ideal for pharmaceutical or food applications, where high purity is a must. Also excellent in semiconductor applications. Generally black, but can be white also.