Teflon encapsulated silicone o-rings, also known as ptfe encapsulated o rings, typically operate within a temperature range of -40°F to 400°F (-40°C to 205°C). However, variations exist based on the specific encapsulation material (FEP or PFA) and core composition (silicone or FKM). These seals balance flexibility with chemical resistance, making them ideal for demanding industrial applications where extreme temperatures and aggressive media are present.
Key Points Explained:
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Standard Temperature Range for PTFE-Encapsulated Silicone O-Rings
- Most references indicate a consistent range of -40°F to 400°F (-40°C to 205°C).
- This range is suitable for silicone-core o-rings, which offer flexibility at low temperatures and stability at moderate highs.
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Material-Specific Variations
- FEP-Encapsulated O-Rings: Max out at 200°C (392°F).
- PFA-Encapsulated O-Rings: Can endure up to 260°C (500°F) due to PFA’s higher thermal stability.
- Why does this matter? PFA variants are preferable for high-temperature applications like chemical processing, while FEP suits moderate environments.
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Core Material Impact
- Silicone cores provide better low-temperature performance (down to -60°C) compared to FKM cores, which may narrow the range slightly.
- Silicone’s flexibility compensates for PTFE’s rigidity, ensuring a reliable seal across the range.
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Critical Limitations
- Avoid flame exposure: PTFE decomposes above 260°C, releasing toxic fumes.
- Thermal cycling: Repeated exposure to extreme highs/lows can degrade encapsulation over time.
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Comparison to Pure PTFE O-Rings
- Unencapsulated PTFE o-rings tolerate -62°C to 232°C, but lack the elasticity of silicone-core designs.
- Encapsulated versions sacrifice some temperature resistance for improved sealing performance under compression.
For purchasers, prioritize the encapsulation material (FEP vs. PFA) and verify core compatibility with your operating conditions. Always consult manufacturer datasheets for application-specific tolerances.
Summary Table:
| Feature | Details |
|---|---|
| Standard Range (PTFE-Silicone) | -40°F to 400°F (-40°C to 205°C) |
| FEP-Encapsulated Max | 200°C (392°F) |
| PFA-Encapsulated Max | 260°C (500°F) |
| Core Material Impact | Silicone excels in low temps; FKM narrows range |
| Critical Limitations | Avoid flames >260°C; thermal cycling degrades seals |
| Pure PTFE Comparison | -62°C to 232°C, but lacks compression elasticity |
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