Encapsulated O-Rings
FEP and PFA encapsulated O-rings consist of an elastomeric core and a seamlessly closed casing of modified PTFE. The elastomer core of encapsulated O-rings is typically made of FKM (Viton) or VMQ (silicone) and guarantees a uniform pre-tensioning at the sealing point. The seamless encapsulated O-ring casing is composed of FEP (fluorinated ethylene propylene) or PFA (perfluoroalkoxy-copolymer). The encapsulated O-ring casing ensures reliable sealing and high resistance to aggressive media. This produces performance similar to that of a PTFE material.
Encapsulated O-rings are exclusively used in static applications since movement or abrasive media can destroy the casing.
Encapsulated Materials Available
This table shows many of our standard materials and links out to our O-ring store. Get in touch with us if you need a custom gasket, custom molded part, or non-standard geometry!
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Temperature Search (°C)
Features of Encapsulated O-Rings
- Encapsulated O-rings have very good resistance to nearly all media ( exceptions are alkali metals and some fluorine compounds)
- Encapsulated O-rings are used in applications in broad range of temperatures
- Encapsulated O-rings are superbly suited for use in the food, chemical and pharmaceutical industries
- Encapsulated O-rings have low contamination
- Encapsulated O-rings have low permeation
- Encapsulated O-rings have a low coefficient of friction that prevents the stick-slip effect
- Encapsulated O-rings are cost-effective, high-performance seals for many critical application areas
Limitations of Encapsulated O-Rings
- Encapsulated O-rings are not compatible with ozone, direct sunlight, UV, or weathering
- Encapsulated O-rings have poor resistance to aromatic fuels, glycol-based brake fluids, polar solvents, non-flammable hydraulic fluids (HFD), aromatic/chlorinated hydrocarbons, and strong acids
- Encapsulated O-rings have a 15 year shelf life
- Service temperature range (varies with application) Typically -20°F to 200°F (-30°C to 100°C) *Special formulations allow range of -65°F to 275°F (-54°C to 135°C)
- Encapsulated O-rings are not recommended for dynamic applications
- Encapsulated O-rings are not recommended for contact with abrasive media
- Encapsulated O-rings are not recommended for high pressure applications
- Encapsulated O-rings are not recommended for high stretch applications or over compression
Please consult a Canyon Components Engineer about your specific application and we will use our decades of experience to formulate a solution that fits your need.
FEP vs PFA Encapsulation
In the context of encapsulated O-rings, FEP and PFA are very similar in their characteristics. PFA stands out for its greater thermal resistance at temperatures exceeding 200 °C. Thanks to the opportunities for combining two encasing materials and two core materials for encapsulated O-rings, the best possible encapsulated O-rings can be selected for a particular application. The formation of the inner elastomer as a hollow core expands the range of applications to uses that require relatively low contact forces.
Advantages FEP
- FEP encapsulated O-rings have high resistance to numerous chemicals
- FEP encapsulated O-rings have high corrosion resistance
- FEP encapsulated O-rings have low compression set
- FEP encapsulated O-rings have a low coefficient of friction
Advantages of PFA
- PFA encapsulated O-rings have all the benefits of FEP encapsulation
- PFA encapsulated O-rings have greater high temperature resistance
- PFA encapsulated O-rings have greater mechanical strength
- PFA encapsulated O-rings have a longer service life
- PFA encapsulated O-rings have a greater resistance to cracking
Please consult a Canyon Components Engineer about your specific application and we will use our decades of experience to formulate a solution that fits your need.
Encapsulated Materials Explained
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| Compound Number | Datasheet | Style | Characteristics | Temperature Range | Equivalent Hardness | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TF75BK00 |
|
FKM Core FEP Encapsulation |
|
• Standard Solution • Low Compression Set |
-26°C to +205°C (-15°F to +400°F) |
90 to 95 Shore A | ||||||
| TS75OR00 |
|
Silicone Core FEP Encapsulation |
|
• Better Low Temp Behavior |
-62°C to +205°C (-80°F to +400°F) |
85 to 90 Shore A | ||||||
| TF75BK50 |
|
FKM Core PFA Encapsulation |
|
• High Abrasion Resistance |
-26°C to +205°C (-15°F to +400°F) |
90 to 95 Shore A | ||||||
| TS75OR50 |
|
Silicone Core PFA Encapsulation |
|
• Wide Temperature Range |
-62°C to +260°C (-80°F to +500°F) |
85 to 90 Shore A | ||||||
| TS75OR01 |
|
Silicone Hollow Core FEP Encapsulation |
|
• Low Contact Pressure • Used in Sensitive Equipment, Such As Glass |
-62°C to +205°C (-80°F to +400°F) |
75 to 80 Shore A | ||||||
| TS75OR51 |
|
Silicone Hollow Core PFA Encapsulation |
|
• Low Contact Pressure • Used in Sensitive Equipment, Such As Glass • Wide Temperature Range |
-62°C to +260°C (-80°F to +500°F) |
75 to 80 Shore A | ||||||
| TM00TR00 |
|
Steel Spring Core FEP Encapsulation |
|
• Used in ultra low temperature applications • Wide Temperature Range |
-251°C to +205°C (-420°F to +400°F) |