PTFE encapsulated O-rings feature a wall thickness range of 0.010 to 0.045 inches, varying with the cross-section of the O-ring. These O-rings combine the elasticity of traditional elastomers with the chemical resistance and low friction of PTFE, making them suitable for demanding applications in industries like pharmaceuticals, food processing, and chemical handling. The encapsulation provides benefits such as non-stick properties, self-lubrication, and sanitary advantages, though they have limitations in dynamic wear resistance and potential flaking.
Key Points Explained:
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Wall Thickness Range
- The PTFE/FEP/PFA resin encapsulation typically ranges from 0.010 to 0.045 inches.
- Thickness depends on the O-ring’s cross-section, with larger cross-sections often requiring thicker encapsulation for durability.
- This range balances flexibility (thinner walls) with mechanical protection (thicker walls).
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Material Composition
- Encapsulation uses PTFE, FEP, or PFA resins, chosen for their chemical inertness and non-stick properties.
- These materials provide a low coefficient of friction (0.2 on metal), reducing wear in static applications.
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Performance Benefits
- Temperature Resistance: Operates from -60°C to +205°C (or up to 232°C in some specifications), suitable for extreme environments.
- Sanitary Design: Prevents fluid contamination by sealing the elastomer core, ideal for food/pharma applications.
- Self-Lubricating: Reduces the need for external lubricants in systems like pumps or valves.
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Limitations
- Dynamic Wear: PTFE coatings can rub off under continuous motion, limiting use to static/low-movement seals.
- Flaking Risk: Loose particles may contaminate sensitive systems (e.g., cleanrooms).
- Chemical Resistance: Only the outer PTFE layer resists chemicals; the core elastomer must still be compatible.
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Applications
- Ideal for static seals in corrosive/sterile environments (e.g., chemical reactors, bioprocessing).
- Avoid high-friction or abrasive conditions where encapsulation could degrade.
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Selection Considerations
- Match wall thickness to cross-section size and pressure requirements.
- Verify core elastomer compatibility with operating temperatures/chemicals.
By understanding these factors, purchasers can optimize PTFE encapsulated O-rings for reliability while mitigating risks like coating wear or contamination.
Summary Table:
| Feature | Details |
|---|---|
| Wall Thickness Range | 0.010–0.045 inches (varies with O-ring cross-section) |
| Material Composition | PTFE/FEP/PFA resins for chemical inertness & low friction (0.2 on metal) |
| Temperature Resistance | -60°C to +232°C |
| Key Benefits | Sanitary design, self-lubricating, non-stick |
| Limitations | Not ideal for dynamic wear; risk of flaking in abrasive conditions |
| Best Applications | Static seals in chemical, pharmaceutical, or food processing systems |
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