Engineering / Materials / FFKM/Kalrez™


FFKM/Kalrez™ perfluoroelastomeric materials


FFKM rubber compounds have excellent resistance to high temperatures and chemicals. Certain grades have a maximum continuous service temperature of 327 °C (621 °F).

Common Uses:

They are commonly used to make o-rings and gaskets that are used in applications that involve contact with hydrocarbons or highly corrosive fluids, or when a wide range of temperatures are encountered.


Standard Compound: -46°C (-51°F) to 327°C (620°F)

Special Compound (High temp): 327°C (257°F)

Hardness: 65 to 95 Shore A

ASTM D1418 Designation: FFKM

ASTM D2000 Designation:

Standard Colors: Black

Optional Colors: White, Clear Amber


FFKM are considered as a Type 3 FKMs composed of VDF, TFE, and perfluoromethylvinylether (PMVE). The addition of PMVE provides better low temperature flexibility compared to copolymers and terpolymers. Typically the fluorine content of type 3 FKMs ranges from 62 to 68 weight percent.


FFKM rubber compounds excel in these areas:

  • Excellent chemical resistance to most chemicals

  • The highest temperature resistant elastomeric material in the market

  • Can be molded into o-rings, x-rings, and a wide variety of custom shapes

  • Available in many different compounds and colors targeted for specific applications and markets

  • Compounds available to meet FDA, USP Class VI and Explosive Decompression Resistance requirements


FFKM rubber compounds are susceptible to molten alkali metals and dynamic applications.

To Find more about DuPont’s Kalrez™ :
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