Encapsulated O-ring

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An encapsulated O-ring is a two-component circular seal with a round cross section. The elastomers impart memory to the seal and are encapsulated in a teflon jacket. The encapsulation protects the elastomer from hostile environments.

Encapsulated O-rings are manufactured in two grades of Teflon and several elastomer materials. The various combinations of these materials cover a full spectrum of operating conditions in virtually every known sealing application, with many new applications on the horizon. Compared with solid O-rings, Teflon encapsulated O-rings function in a broader range of environments.

The two grades of Telfon is : FEP Teflon and PFA Teflon.

FEP Teflon combines superb corrosion resistance, sealing integrity and an operating temperatures range of -450 to + 400oF ( -267 ~ + 205oC) .

PFA Teflon, a fluorocarbon copolymer similar to FEP, also provides greatly improved mechanical and creep properties at higher operating temperatures: -450 to + 500oF ( -267 ~ + 260 oC) .

The homogeneously welded Teflon jacket with an energizer imparts inherent memory to the O-ring. Each energizer varies in its ability to return to its original shape when subjected to a compressive force. Selecting the optimal material and dimensions depends on the application and the specific requirements of the seal.

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