Fluorocarbon Rubber (FKM / FPM / VITON)

Fluoroelastomer or Fluorocarbon Rubber (FKM/FPM) is a synthetic rubber with Fluorine as one of its main constituents. Fluorine content may vary from 65% to 70% depending on the grade selected.

66% Fluorine grades are the most widely used and are Bisphenol Cured. Other grades may be Bisphenol / Peroxide cured.

Fluorocarbon Rubber has excellent high temperature capabilities along with resistance to ozone, weathering, oxygen, many acids, solvents & chemicals.

Special Fluorocarbon grades offer very good low temperature properties.

Fitco offers various Grades/Families of Viton from Chemours (Formerly Dupont)

  • Viton A Family (DiPolymers)
  • Viton B Family (Terpolymers)
  • Viton F Family (Terpolymers)
  • Viton GLT / Viton GFLT /Viton GF / Viton XLT / Viton ULT / Viton ETP / Viton TBR


  • Good resistance to Petroleum Oils/Fuels, Mineral Oils/Grease
  • Good Resistance to Ozone, Weathering & Aging Resistance
  • Resistance to Flame Resistivity & Acids
  • Good Resistance to Aliphatic / Aromatic Hydrocarbons
  • Works well with Vacuum Applications


  • Poor resistance to Steam
  • Poor resistance to Ketones
  • Poor Resistance to Phosphate Ester Fluids
  • Poor Resistance to Formic & Acetic Acids
  • Does not works well with Brake Fluids (Glycol Base)