Teflon encapsulated O-rings are defined by two primary dimensions: the inside diameter (ID) and the cross-section (CS). These dimensions ensure compatibility with specific applications, combining the chemical resistance of Teflon (FEP or PFA) with the elasticity of an elastomer core (silicone or FKM). The encapsulation design protects the core from harsh environments while maintaining sealing performance. Their sizing is critical for proper fit and function in extreme thermal, chemical, or mechanical conditions.
Key Points Explained:
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Primary Dimensions
- Inside Diameter (ID): The inner measurement of the O-ring, determining the fit around a shaft or within a groove.
- Cross-Section (CS): The thickness of the O-ring’s material, influencing sealing pressure and flexibility.
- Standard sizing ensures interchangeability and precise sealing in systems like pumps, valves, or reactors.
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Material Composition
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Teflon Jacket: Made of FEP (fluorinated ethylene propylene) or PFA (perfluoroalkoxy), offering:
- Chemical resistance to acids, solvents, and petroleum products.
- Thermal stability (PFA withstands higher temperatures than FEP).
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Elastomer Core: Typically silicone or FKM, providing:
- Elasticity for compression and rebound.
- Resilience against deformation under pressure.
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Teflon Jacket: Made of FEP (fluorinated ethylene propylene) or PFA (perfluoroalkoxy), offering:
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Design Advantages
- Encapsulation: The seamless Teflon layer shields the core from degradation, extending lifespan in corrosive or high-temperature environments.
- Dual Performance: Combines PTFE’s inertness with the core’s sealing force, ideal for aerospace, pharmaceutical, or chemical processing.
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Application-Specific Considerations
- Temperature: PFA is preferred for extremes (>200°C), while FEP suits moderate ranges.
- Chemical Exposure: FEP resists alcohols and solvents; PFA handles stronger acids.
- Mechanical Stress: Thicker cross-sections (e.g., 3 mm vs. 1.5 mm) tolerate higher pressures.
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Selection Guidance
- Match ID/CS to groove dimensions (e.g., AS568 standards).
- Prioritize PFA for aggressive thermal/chemical conditions; FEP for cost-effective corrosion resistance.
- Verify compatibility with dynamic vs. static sealing needs.
For detailed specifications, explore seal teflon o ring options tailored to your system requirements. These O-rings exemplify how material innovation meets precision engineering in critical sealing solutions.
Summary Table:
| Key Aspect | Details |
|---|---|
| Primary Dimensions | - Inside Diameter (ID): Fit around shafts/grooves. |
| - Cross-Section (CS): Thickness affecting sealing pressure. | |
| Materials | - Teflon Jacket (FEP/PFA): Resists chemicals/temperature. |
| - Elastomer Core (Silicone/FKM): Provides elasticity. | |
| Design Benefits | - Encapsulation protects core; dual performance for harsh environments. |
| Selection Tips | - Match ID/CS to AS568 standards; choose PFA for extreme conditions. |
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