What are Fluorocarbons – FKM/FPM?

Fluorocarbon rubber is part of the fluoroelastomer family. It is also known under the names FPM (DIN/ISO standard) or FKM (ASTM standard).

All fluorocarbon rubbers – FKM contain vinylidene fluoride as a monomer. They can be divided into different classes based on their chemical composition, fluorine content or cross-linking mechanism.

Fluorocarbon rubber – A high-performance, high-density elastomer

Fluorocarbon rubbers provide excellent resistance to high temperatures and are stable in the presence of many aggressive chemicals and fluids (oil, diesel, ethanol blend or body fluid). They withstand temperatures of up to 250°C without losing their mechanical properties.

The performance of fluoroelastomers in harsh chemicals depends on the nature of the base polymer and the blending ingredients used to mold the final products (e.g., O-rings). Some formulations are generally compatible with hydrocarbons, but incompatible with ketones such as acetone and methyl ethyl ketone, ester solvents such as ethyl acetate, amines, and organic acids such as acetic acid.

They are easily distinguished from many other elastomers due to their high density of over 1800 kg/m3, significantly higher than most types of rubber.

Summary of fluorocarbon – FKM/FPM properties


  • Good resistance to mineral oils
  • Very good resistance to fuels
  • Excellent resistance to ozone
  • Good level of compression set at high temperature
  • Excellent hot water and vapor resistance
  • Operating temperature: -10°C to +200°C


  • Resistance to ketones, ester solvents, amines and organic acids
  • Resistance to cold temperatures

Fluorocarbon – FKM/FPM approvals

  • NFL 17-260
  • NFL 17-164
  • FDA

Fluorocarbon – FKM/FPM applications

More expensive than neoprene elastomers or nitrile rubber, fluorocarbon rubber is rather reserved for high performance applications in demanding environments. It is widely used in the manufacture of sealing rings and O-rings for aeronautical, automotive and industrial applications given its very good resistance to hydrocarbons, acids and alkalis.

Fluorocarbon – FKM/FPM brands

Fluorocarbon rubbers are also marketed under several brands, including the following:

  • Viton®
  • Dyneon®
  • Technoflon®
  • DAI-EL®
  • Fluorel®
  • Aflas®