Teflon® Encapsulated O-Ring : How to Specify

Specification of an encapsulated o-ring  requires the engineer to call out the following criteria:

1. Geometry; call out of inside diameter and cross section or Aerospace designation AS568

2. Encapsulation material FEP, PFA or HIgh Purity PFA (semicon)

3. Core material or silicone, FKM or EPDM.

Engineers often question what encapsulation material that should be utilized in a specific application. FEP is a good choice where high temperature resistance is not required, core material choice can be silicone or FKM.  PFA is utilized  where temperatures up to 500°F (260°C) are possible, silicone core is your best choice for these applications. 

See Material Info for comprehensive mechanical properties for elastomer and encapsulation types

Comparison Table:

Our sealing experts can recommend your best choice for specific applications. 

For sealing consultation contact: customerservice@m-cor.com