Perfluoroelastomer (FFKM) O-Rings
Commonly referred to as Isolast O-Rings (Trelleborg Sealing Solutions), Kalrez O-Rings (DuPont Dow), Chemraz O-Rings (Greene, Tweed & Co.), and Simriz O-Rings (Simrit). This expensive elastomer type is usually produced as a terpolymer of tetrafluoroethylene, a cure site monomer used for cross-linking, and a perfluorovinyl ether. Best O-Ring compound for chemical resistance.
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