FFKM (Perfluoroelastomer)

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FFKM Seals & O-Rings offer the highest operating temperature and the most comprehensive chemical resistance of any elastomer.

Competitive lead times & pricing for FFKM Seals & O-Rings from Lanson Polymers allied with our vast experience in the design & supply of critical seals & components into a variety of markets will allow you to specify the optimum solution for your application.

A wide variety of seals and components can be manufactured using FFKM Materials including:
O-Rings, T-Seals, L-Seals and Cap Seals amongst others.

Common Trade names include Kalrez®, Chemraz®, Perlast®.

Temperature Range

-20°C to +330°C



Lanson Polymers FFKM Compounds

LP-605: 75 Durometer – Temperatures up to +260°C – general use compound

LP-617: 80 Durometer – Temperatures up to +330°C

LP-619: 90 Durometer – Temperatures up to +260°C – Rapid Gas Decompression Resistant

The above compounds are only a small sample of our broad range of FFKM materials – please contact us to discuss your particular application and we can recommend an optimum solution.


Typically used as Seals, O-Rings & other components for long-term reliability in extreme environments.

Seals and O-Rings in pumps, reactors and flange joints
Valve stem packing systems
High-performance parts for aerospace, oil and gas equipment, transportation, and chemical processing
Life science applications
Semiconductor processing
Photovoltaic manufacturing seals
Food contact materials


Highest temperature resistance

Almost universal chemical resistance

Maintains seal integrity

Reduces maintenance and operating costs

Long seal life

Typical temperature range -20˚C to +330˚C




Kalrez® is a Registered Trademark of DuPont
Chemraz® is a Registered Trademark of Greene, Tweed
Perlast® is a Registered Trademark of Precision Polymer Engineering Ltd