Teflon backup rings are engineered to perform reliably across a broad temperature spectrum, balancing chemical resistance with thermal stability. Their -200°C to 260°C range accommodates cryogenic environments and high-heat industrial processes, though optimal performance depends on factors like pressure, media compatibility, and duration of exposure.
Key Points Explained:
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Temperature Range Capabilities
- Lower Limit (-200°C): PTFE (back up ring teflon) retains flexibility and sealing integrity even in cryogenic applications, such as LNG handling or aerospace systems.
- Upper Limit (260°C): Near this threshold, PTFE begins to soften, potentially affecting compression set and sealing force. Short-term spikes may be tolerated, but prolonged exposure risks deformation.
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Performance Considerations
- Thermal Expansion: PTFE expands ~10x more than metals under heat, requiring careful gland design to prevent extrusion.
- Pressure-Temperature Relationship: At 260°C, maximum pressure ratings drop significantly—consult manufacturer charts for combined load limits.
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Material Enhancements
- Filled PTFE (e.g., glass/graphite): Extends thermal stability marginally (up to 280°C) but may trade off chemical resistance.
- Alternative Polymers (PEEK/PI): For >260°C needs, these offer higher thermal resistance but at increased cost.
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Application-Specific Factors
- Cyclic Thermal Loading: Repeated heating/cooling can accelerate wear; monitor for creep or stress cracking.
- Media Compatibility: Even within the temperature range, aggressive chemicals (e.g., molten alkali metals) may degrade PTFE.
For critical applications, always validate performance with real-world testing under expected operating conditions.
Summary Table:
| Aspect | Details |
|---|---|
| Temperature Range | -200°C to 260°C (short-term spikes tolerated near upper limit) |
| Lower Limit (-200°C) | Retains flexibility and sealing integrity in cryogenic applications |
| Upper Limit (260°C) | Softening risk; prolonged exposure may cause deformation |
| Material Enhancements | Filled PTFE (e.g., glass/graphite) extends range to 280°C |
| Alternatives | PEEK/PI for >260°C needs, though at higher cost |
| Key Considerations | Thermal expansion, pressure limits, cyclic loading, and chemical resistance |
Ensure your seals perform flawlessly in extreme temperatures—contact KINTEK today for precision-engineered PTFE backup rings tailored to your application. We specialize in custom fabrication for semiconductor, medical, and industrial sectors, delivering durable solutions from prototypes to high-volume orders. Let’s optimize your sealing performance together!