FFKM/Kalrez™ perfluoroelastomeric materials
Description:
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.
Properties:
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
Production:
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.
Advantages:
FFKM rubber compounds excel in these areas:
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Excellent chemical resistance to most chemicals
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The highest temperature resistant elastomeric material in the market
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Can be molded into o-rings, x-rings, and a wide variety of custom shapes
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Available in many different compounds and colors targeted for specific applications and markets
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Compounds available to meet FDA, USP Class VI and Explosive Decompression Resistance requirements
Limitations:
FFKM rubber compounds are susceptible to molten alkali metals and dynamic applications.