O-ring seal

FEP-encapsulated

It sometimes happens that a conventional elastomer O-ring does not offer sufficient chemical resistance to the process fluid. What is done then is to replace the elastomer with PTFE, which has always been considered an ideal sealing material because of its chemical resistance. And a new problem arises: PTFE lacks sufficient elasticity and the new O-ring does not guarantee a safe sealing of the fluid in the long term. The solution to this situation is to coat the conventional elastomer with a completely closed, seamless thermoplastic material, such as FEP or PFA resin, to become an encapsulated O-ring. The new gasket combines the chemical inertia of FEP or PFA, with the elasticity of elastomers such as silicone (VMQ) or fluorelastomer (FPM/Viton®) and even EPDM. The elastomer (VMQ, FPM or EPDM) in the encapsulated seal core provides elastic memory along with appropriate resistance to the Compression Set effect, even at high temperatures.