Encapsulated O-Rings
| 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. |
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FEP Teflon combines superb corrosion resistance, sealing integrity and an operating temperatures range of -450 to +400°F (-267 ~ +205°C).
PFA Teflon, a fluorocarbon copolymer similar to FEP, also provides greatly improved mechanical and creep properties at higher operating temperatures: -450 to + 500°F (-267 ~ +260°C).
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.
Advantage of using Encapsulated O-Rings:
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Broad Range of Applications:
Although solid elastomer O-rings are suitable for a broad range of applications, there are limitions. Consider encapsulated O-rings as the choice which permits equipment to perform in a broader range of hostile environments and temperatures while retaining their sealing capabilities. Here are some of the application examples.
Typical Applications:
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