Fluorocarbon (FKM, FPM, Viton®)

- Sep 01, 2017-

General Information
ASTM D2000                             HK

SAE J 200 Codes 
Relative Cost                              High

Primary Uses

  • Automotive fuel handling

  • Aircraft engine seals

  • High temperature applications requiring good compression set

  • General industrial seals and gaskets

Perform Well in…

  • Petroleum products

  • Fuel or blend with methanol or ethanol

  • Diesel or blend with biodiesel

  • Mineral oil and grease

  • Silicone oil and grease

  • High vacuum

  • Ozone, weathering and very high temperature air

  • Strong acid

Doesn’t Perform Well in…

  • Ketones

  • Amines

  • Low molecular wieght esters and ethers

  • Nitro hydrocarbons

  • Hot hydrofluoric or chlorosulfonic acids

  • Phosphate ester based hydraulic fluids – Skydrol®

FKM were introduced in 1957 (Dupont - Viton®). In general all fluorinated polymers are highly fluorinated hydrocarbon polymers. They are very stable and possess exceptional resistance to oxidation, weather, flame, oil, chemical attack and swelling in a wide range of liquids.

Fluorocarbon exhibits resistance to a broad range of chemicals combined with very good high temperature properties more so than any of the other elastomers. It is the closest available approach to a universal elastomer for sealing in the use of O-rings and other custom seals over other types of elastomers. FKM can be classified in
many subgroups according to:

1. Fluorine content: general type (A—66%), middle fluorine content type (B&GBL—69%), high fluorine content type (F&GF—70%), improving low temperature flexibility type (GLT, GFLT) and excellent resistance to more chemicals and solvents (ETP & FFKM). The higher the fluorine content the better the chemical resistance.

2. Polymer: A—dipolymer, B, F and GF—terpolymer.
3. Cure system: standard FKM compounds are bisphenol cured. FKM compounds with peroxide-cured possess better acid solution resistance than the bisphenol cured.

Application Advantages

  • Excellent chemical resistance

  • Excellent heat resistance

  • Good mechanical properties

  • Good compression set resistance


  • Depending on structure and fluorine content (65% to 71%) FKM materials can differ with regards to their chemical resistance and cold-flexibility. The chemical resistance improves with increasing fluorine levels. However, as the fluorine content increases the low-temperature flexibility of polymer decreases. For low-temperature application special FKM types have been developed.

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