This specification covers a perfluoroether elastomer in the form of molded rings. These rings have been used typically as static sealing rings and molded in place gaskets at temperatures between -65 and +400 degrees F (-54 and +203 degrees C). The cross-section of such rings is usually not over 0.275 inch (6.98 mm) in diameter or thickness. The material has resistance to a variety of fuels, engine oils, hydraulic oil, and hydraulic fluid, but usage is not limited to such applications. Each application should be considered individually.