FEP Encapsulated O-Ring

With an elastomer core and a jacket of Teflon® fluoropolymer, FEP encapsulated O-ring combine the excellent chemical resistance of PTFE with the elastic behavior of an elastomer. The core is either FKM, Silicone or Stainless Steel. The jacket is FEP or PFA.


FEP encapsulated O-ring is a top choice when a standard O-ring has inadequate chemical resistance for an application and or when a solid PTFE O-ring does not have the elasticity for reliable, long term fluid sealing.

Encapsulated O-ring is often recommended where chemical resistance and or hygiene is required.

Typical applications for encapsulated o-ring include:

  • Flanges

  • Valve Stems

  • Pumps

  • Joints

  • Turbo Expanders

  • Cryogenic seals

    Materials for encapsulated o-ring include:

    • Silicone Core- Lowest Cost, Most Readily Available

    • Hollow Silicone Core- Less Force Required to Compress

    • FKM Core- Greater Chemical Resistance and Compression Set Resistance

    • Steel Spring Core- Cryogenic Sealing Applications


    Why consider encapsulated o-ring

    Very good resistance to nearly all media (exceptions are alkali metals and some fluorine compounds)

    Applications in broad range of temperatures

    Superbly suited for use in the food, chemical and pharmaceutical industries

    Low contamination

    Low permeation

    Low coefficient of friction prevents the stick-slip effect


    Cost-effective, high-performance seal for many critical application areas

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