FFKM O rings (high temperature O rings)

FFKMs are Perfluoroelastomeric compounds containing an even higher amount of fluoride than FKM. They have further improved resistance to high temperatures and chemicals and even withstand environments where Oxygen-Plasma are present for many hours. Certain grades have a maximum continuous service temperature of 327 °C (621 °F). They are commonly used to make O-rings and gaskets that are used in applications that involve contact with hydrocarbons or highly corrosive fluids, or when a wide range of temperatures is encountered.