Fluorocarbon Rubber (FKM) | Automotive | Trelleborg

Fluorocarbon Rubber (FKM)

In automotive applications, FKM is known in particular for its very good resistance to fuel, oil and aggressive media as well as the excellent resistance to ozone, weathering and ageing. Depending on structure, fluorine content and used curing system FKM materials can differ with regards to their chemical resistance and cold-flexibility. The operating temperature of FKM ranges from -20°C/-4°F to 200°C/392°F, for a short period of time up to 230°C/446°F.

Special FKM grades can be used down to -45°C/-49°F (XLT grades of Trelleborg Sealing Solutions).

The material has:

  • Resistance to oil & grease
  • (problematic additives!)
  • Very good resistance to fuels
  • Excellent heat resistance
  • Excellent weather & ozone resistance
  • Good acid resistance

Due to high chemical resistance and low swelling in fuels (especially when containing ethanol and methanol) FKM can typically be found in the complete fuel supply chain (fuel injectors, quick connectors, high pressure pumps, etc.). Additionally, gaskets in ECUs for gear boxes are also a field of application.

O-rings, customized gaskets