Teflon® encapsulated O-Rings combine the sealing force and resilience of an elastomer with the chemical resistance of Teflon®. They're comprised of an elastomeric core of silicone or Viton™ with a relatively thin, molded encapsulation of Teflon® FEP or PFA polymer. The result is an elastomeric PTFE seal with superior sealing capability.  FEP encapsulated O-Rings are resistant to solvents and chemically inert (except for attack by molten alkaline metals, fluorine and some halogenated compounds at high temperatures). Yet, their elastomeric memory is near that of rubber O-Rings. At elevated temperatures (up to 500°F), PFA offers improved mechanical and creep properties. 

-75 to 500 °F (PFA w/ silicone core)

• This operating range is greatly dependent on the jacket and core combination. Ask our sales representative for specific temperature ranges for your selected product.