What is FKM (Viton®)?
FKM (by ASTM D1418 standard) (equivalent to FPM by ISO/DIN 1629 standard) is the designation for about 80% of fluoroelastomers as defined in ASTM D1418.
Fluorocarbon rubber is the most significant single elastomer. Highly fluorinated carbon-based polymers used in applications to resist harsh chemical and ozone attack. The name Viton ® is trademark of Dupont.
Fluorocarbon elastomers are important in the seal industry and the O-rings are a solution for mechanical devices requiring maximum resistance to elevated temperatures and to many fluids such as the use in aircraft, automobile and other FKM has a high temperature range between -26°C to +205°/230°C (-15°F to +400°/440°F). For short working periods it will take even higher temperatures. It has a wide range of chemical compatibility, temperature range, low compression set, and excellent aging characteristics. Besides this it is flame-retardant but dangerous after a fire. Due to fluorine residues in the carbon residues, the material is heavy material and a stiffer elastomer.