GD-IPS-4 4" Bolted Coupling IPS Gasket, FKM, Replacement

Fluoroelastomer are special purpose fluorocarbon-based synthetic rubber categorized under ASTM designation of “FKM”. The FKM O-Ring is commonly referred to as a “Viton® O-ring” Elastomers. However, “Viton® “ is only one of many FKM brand names and is registered trademarks of DuPont Performance Elastomer L.L.C. Spears® uses general purpose Type 1 FKM O-Ring with a minimum of 66% fluorine content for the best balance of overall properties. FKM exhibits a very broad range of chemical resistance, including petroleum oils, di-ester based lubricants, silicate fluids and greases, halogenated hydrocarbons, and mineral acids. FKM is not recommended for ketones, amines, anhydrous ammonia, hot hydrofluoric or chlorosulfonic acids, or automotive brake fluids.