The specific gravity of PTFE (Polytetrafluoroethylene) typically falls within the range of 2.10 to 2.20 g/cc. This property is a key indicator of its density relative to water and is crucial for applications requiring precise material selection, such as in chemical processing or high-performance components. PTFE's specific gravity reflects its molecular structure and purity, making it a reliable choice for environments demanding chemical resistance and thermal stability.
Key Points Explained:
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Specific Gravity Range of PTFE
- PTFE's specific gravity is consistently documented as 2.10–2.20 g/cc across references. This narrow range indicates high material consistency, which is critical for quality control in industries like aerospace or medical device manufacturing.
- For context, water has a specific gravity of 1.0, so PTFE is over twice as dense, affecting buoyancy and weight calculations in design.
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Why Specific Gravity Matters for PTFE Applications
- Material Selection: Engineers use specific gravity to compare PTFE with alternatives (e.g., nylon: 1.15 g/cc) for weight-sensitive designs.
- Performance Predictions: Higher density correlates with PTFE's chemical inertness and thermal stability (up to 260°C), vital for seals or custom ptfe parts in corrosive environments.
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Relationship to Other Properties
- While PTFE's specific gravity suggests durability, its low tensile strength (2,990–4,970 psi) limits load-bearing use. This trade-off underscores the need to balance density with mechanical requirements.
- The softness noted in references explains why PTFE is often combined with fillers (e.g., glass fibers) to enhance strength without drastically altering specific gravity.
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Practical Implications for Buyers
- Quality Verification: Suppliers should provide certified test data confirming specific gravity within 2.10–2.20 g/cc to ensure material purity.
- Cost Efficiency: Higher-density PTFE may incur greater material costs, but its longevity in harsh conditions often justifies the investment.
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Exceptions and Variations
- Filled PTFE (e.g., carbon-filled) may slightly deviate from this range due to additive densities. Always request specifications for modified grades.
By understanding these nuances, purchasers can make informed decisions tailored to their project’s mechanical, chemical, and budgetary needs.
Summary Table:
| Property | PTFE Value | Significance |
|---|---|---|
| Specific Gravity Range | 2.10–2.20 g/cc | Indicates material density and purity; critical for quality control. |
| Comparison to Water | ~2.1x denser | Affects buoyancy and weight in design applications. |
| Thermal Stability | Up to 260°C | Suitable for high-temperature environments like chemical processing. |
| Tensile Strength | 2,990–4,970 psi | Limits load-bearing use but balances with chemical inertness. |
| Common Applications | Seals, liners, labware | Ideal for semiconductor, medical, and industrial sectors. |
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At KINTEK, we specialize in high-performance PTFE solutions—from custom seals to labware—tailored for semiconductor, medical, and industrial applications. Our materials meet strict specific gravity standards (2.10–2.20 g/cc) to ensure reliability in corrosive or high-heat environments.
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