Commonly referred to as Isolast (Trelleborg Sealing Solutions), Kalrez (DuPont Dow), Chemraz (Greene, Tweed & Co.), and Simriz (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.
Metric O-Ring Dimensions are defined by CS Cross Section and ID Inside Diameter. N2.00X012 = 2mm CS X 12mm ID