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.

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.

Advantage of using Encapsulated O-Rings:

Corrosion Resistant
Low absorption
Uniform dimensions
Non-flammable
Low Ovality
Excellent Resilience
Enclosed Core
Reusable
Live Seal
Abrasion Resistant
Permeability
Chemically Inert
Impact Strength
Smooth surfaces
No Swelling

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

Mechanical Seals
Seals in Diaphragm Pumps
Cryogenics
Mechanical Pumps
Filter elements
Filter Housings
Reusable syringes
Air-Operated Vents
Gas Service
Corrosive Fluid Seals
High Purity Seals
Low Pressure, Quick disconnect piping systems
Vacuum Service
Reflief and Emergency Valves
Large Diameter Access Covers
Pressure Vessels
Compressors
Face Flange Seals
Glass Heat Exchanger Tube/ Tubesheet Seals
Dairy and Beverage Service
Butterfly Valves