PTFE coated encapsulated O-rings are designed to combine the sealing properties of the rubber O-ring with the chemical resistance of PTFE.

They are generally manufactured from FKM or silicone rubber and are coated in a thin molded layer of PTFE FEP or PFA.

• This provides a unique seal popular for high friction and aggressive chemical applications.

• FEP encapsulated O-rings are our most common and are resistant to solvents and chemicals (except for alkaline metals, fluorine and some halogenated compounds at high temperatures).

• They have a low coefficient of friction and a very low permeability to gases making them suitable

• for harsh environments. PTFE coated encapsulated o-rings also have a good elastomeric memory.

• We can also supply rigid PTFE o-rings which have a high compression set.

FEP-encapsulated O-Rings (Fluorinated Ethylene Propylene):
* Outstanding chemical and corrosion resistance
* Low coefficient of friction
* Resilience with choice of elastomeric cores
* Low compression set
* No mould charge
* Solid silicone, Viton cores

PFA-encapsulated O-Rings (Perfluoroalkoxy). Same as FEP above but with these added benefits:
* Higher mechanical strength
* Better flex-life
* Low vapor permeation
* Excellent stress and crack resistance
* Longer wearability
* Solid silicone & Viton core