PTFE (Polytetrafluoroethylene) exhibits a tensile strength range typically between 2990 to 4970 psi (20.6 to 34.3 MPa), as per ASTM standards. This range can vary slightly depending on factors like manufacturing processes, additives, or specific formulations (e.g., filled PTFE). Its low friction, chemical resistance, and machinability make it suitable for diverse applications, including custom PTFE parts in industries requiring non-stick or high-performance components.
Key Points Explained:
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Tensile Strength Range
- Primary Range: 2990–4970 psi (20.6–34.3 MPa), as cited in multiple references.
- Alternative Data: Some sources note 22 MPa (ASTM D4894) or narrower ranges (e.g., 3625–4496 psi for PTFE O-rings), reflecting variations in testing methods or material grades.
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Factors Influencing Variability
- Manufacturing Process: Compression molding or sintering can alter crystallinity, affecting strength.
- Additives: Glass-filled or carbon-filled PTFE may exhibit higher tensile values.
- Temperature/Testing Conditions: Cold machining improves workability but may not significantly change tensile properties.
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Complementary Mechanical Properties
- Elongation at Break: 220% (ASTM D4894) or 300–400% for O-rings, highlighting PTFE’s flexibility despite moderate tensile strength.
- Friction Coefficient: Static COF of 0.05–0.10 and dynamic COF of 0.04–0.08 enable self-lubricating performance.
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Applications and Limitations
- Advantages: Ideal for seals, bearings, and custom PTFE parts due to chemical inertness and low friction.
- Fabrication Challenges: Difficult to glue/weld, but machining or sintering allows precise shaping.
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Industry Relevance
- Standards Compliance: ASTM D4894 ensures consistency for critical uses in medical, automotive, or food processing equipment.
- Performance Trade-offs: While not the strongest polymer, PTFE’s unique properties justify its use where friction or corrosion resistance is prioritized.
For purchasers, balancing tensile strength with other properties (e.g., wear resistance, temperature stability) is key when specifying PTFE components. Would a filled PTFE grade better meet your load-bearing needs?
Summary Table:
| Property | Value Range | Notes |
|---|---|---|
| Tensile Strength | 2990–4970 psi (20.6–34.3 MPa) | Varies by grade and manufacturing process |
| Elongation at Break | 220% (ASTM D4894) or 300–400% for O-rings | Highlights flexibility |
| Friction Coefficient | Static: 0.05–0.10, Dynamic: 0.04–0.08 | Self-lubricating performance |
| Key Applications | Seals, bearings, custom PTFE parts | Ideal for chemical inertness and low friction |
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