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By certification 
DescriptionFEP ENCAPSULATED SEAL is consisted of a seamless and uniform Teflon® FEP encapsulation which completely encloses a core material of either silicone or Viton® elastomers. The combination of these components creates a seal that is virtually chemically inert and compression set resistant for use in harsh sealing environments.AdvantageHigh Chemical Resistance Outperforms solid PTFE O-Rings Wide Temperature RangeNon Stick SurfaceLow Coefficient of FrictionSanitaryUnlimited SizesLow Compression SetEncapsulated Seal VS Solid PTFEA standard elastomeric seal has inadequate chemical resistance for a specific application,Website:://.tenglongsealings.com, andA solid PTFE seal does not offer sufficient elasticity for reliable, long-term fluid sealing.These are held in a variety of general and high performance elastomers to suit the vast majority of industrial and specialised oil
