Perfluoroelastomeric materials are FFKMs. Common brand names for Perfluoroelastomer: Isolast / Kalrez / Perlast.
Perfluoroelastomers have excellent resistance to high temperatures and chemicals.
Certain grades have a maximum continuous service temperature of 327 °C (621 °F).
They also show low swelling with almost all media.
They are commonly used in Chemical and Process industries where applications that involve contact with hydrocarbons or highly corrosive fluids, or when a wide range of temperatures are encountered.