Teflon balls, made from polytetrafluoroethylene (PTFE), are highly valued in industrial and engineering applications due to their unique combination of mechanical, thermal, and chemical properties. These properties include low friction, high heat resistance, chemical inertness, and excellent electrical insulation. Their versatility makes them ideal for seals, bearings, and other components requiring durability in harsh environments. Below is a detailed breakdown of their key characteristics and why they matter for practical applications.
Key Points Explained:
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Physical Properties
- Specific Gravity: 2.10–2.20 g/cc, indicating a relatively lightweight material compared to metals.
- Hardness (Shore D): 55D, offering a balance between rigidity and flexibility.
- Tensile Strength: 2,990–4,970 psi, suitable for moderate load-bearing applications.
- Flexural Strength: 2,490 psi, providing resistance to bending stresses.
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Thermal Properties
- Melting Point: 621°F (327°C), allowing use in high-temperature environments.
- Heat Deflection Temperature: 248°F (120°C), the threshold for deformation under load.
- Operating Temperature Range: Wide, from cryogenic temperatures up to 500°F (260°C) intermittently.
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Chemical and Surface Properties
- Chemical Resistance: Inert to most acids, bases, and solvents, making teflon balls ideal for corrosive environments.
- Water Absorption: 0.01% over 24 hours, ensuring minimal swelling or degradation in wet conditions.
- Nonstick & Low Friction: Coefficient of friction of 0.110, reducing wear in dynamic applications.
- Anti-Adhesive Qualities: Prevents material buildup, critical for clean processes.
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Electrical Properties
- Dielectric Constant: 2.1, excellent for insulating applications.
- High Bulk Resistivity: Makes Teflon balls effective in electrical components.
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Durability and Machinability
- Long Surface Life: Resists wear and maintains performance over time.
- Ductility: Can deform without breaking, useful for sealing applications.
- Customizable: Can be machined or molded into precise sizes and shapes.
These properties collectively make Teflon balls indispensable in industries like aerospace, chemical processing, and medical devices, where reliability under extreme conditions is paramount. Their adaptability and resistance to degradation ensure they meet the rigorous demands of modern engineering.
Summary Table:
| Property | Value/Range | Significance |
|---|---|---|
| Specific Gravity | 2.10–2.20 g/cc | Lightweight alternative to metals. |
| Hardness (Shore D) | 55D | Balanced rigidity and flexibility. |
| Tensile Strength | 2,990–4,970 psi | Suitable for moderate loads. |
| Melting Point | 621°F (327°C) | Withstands high-temperature environments. |
| Chemical Resistance | Inert to most acids/bases/solvents | Perfect for corrosive settings. |
| Coefficient of Friction | 0.110 | Reduces wear in dynamic applications. |
| Dielectric Constant | 2.1 | Excellent electrical insulation. |
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