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AS568-438 Chemcial Resistance Perfluoroelastomer (FFKM) O-Ring


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  • Model: FFKM-438
  • 0 in Stock
  • 6-1/4"ID X 6-3/4"OD X 1/4"CS
  • Actual: 6.225"ID X 0.275"CS
  • Metric: 158.12mm ID X 6.99mm CS
  • PDF Data Sheets

6-1/4"ID X 6-3/4"OD X 1/4"CS

Chemical Resistant General Purpose Perfluoroelastomer (FFKM) O-Rings

AKA: FFKM Dupont® Kalrez®, Markez®, Chemraz®, Perlast®, Isolast®, Parofluor®, Perfluorelastomer
Common Names: Perfluoroelastomers, FFKM
Trade Names: Chemraz®, Kalrez®, Markez®, Isolast®, Parofluor® , Perlast®.

General Description: Perfluoroelastomer (FFKM) is a highly fluorinated elastomeric family of compounds that provide the most resistance to chemicals and high temperature than any other elastomer in the market. FFKMs are considered the elastomeric equivalence to PTFE (Teflon) due to its excellent chemical and temperature resistance.


  • Excellent chemical resistance to most chemicals.
  • The highest temperature resistant elastomeric material in the market.
  • Molded into o-rings, can be molded into X-rings and a wide variety of custom shapes.
  • Available in many different compound and colors targeted for specific applications and markets


  • Molten alkali metals
  • Dynamic applications

Operating temperature: +5°F to +608°F (-5°C to +320°C)