Teflon balls, known for their chemical resistance and low friction properties, have a hardness rating of R58 on the Rockwell scale. This rating indicates a relatively soft material compared to metals but is typical for polymers like PTFE (Teflon). Their Shore D hardness is around 55D, aligning with their flexible yet durable nature. These properties make them suitable for applications requiring corrosion resistance, low friction, and sealing capabilities, though they are not ideal for high-load or high-wear scenarios.
Key Points Explained:
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Hardness Rating of Teflon Balls
- Teflon balls consistently exhibit a hardness rating of R58 on the Rockwell scale. This measurement reflects their softness compared to metals but is typical for PTFE materials.
- The Shore D hardness is approximately 55D, which aligns with their flexible yet durable characteristics.
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Material Properties Supporting Hardness
- Tensile Strength: Ranges from 2990–4970 psi (with some references citing 3900 psi), indicating moderate resistance to stretching or pulling forces.
- Flexural Strength: 2490 psi, showing their ability to bend without breaking.
- Coefficient of Friction: 0.110, which contributes to their low-wear and smooth performance in dynamic applications.
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Applications and Limitations
- Teflon balls excel in environments requiring chemical resistance, waterproofing, and low friction, such as seals or bearings in corrosive or non-load-intensive settings.
- Their softness (R58) limits use in high-stress or abrasive conditions, where harder materials like metals or ceramics might be preferable.
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Additional Relevant Properties
- Thermal Stability: Melting point of 621°F (327°C) and heat deflection at 248°F (120°C), suitable for moderate-temperature applications.
- Dielectric Properties: Dielectric constant of 2.1, making them useful in electrical insulation.
For more details on teflon balls, their hardness and other properties make them a versatile choice for specific industrial and mechanical applications, though their softness requires careful consideration in design.
Summary Table:
| Property | Value/Rating |
|---|---|
| Rockwell Hardness (R) | R58 |
| Shore D Hardness | 55D |
| Tensile Strength | 2990–4970 psi (avg 3900 psi) |
| Flexural Strength | 2490 psi |
| Coefficient of Friction | 0.110 |
| Melting Point | 621°F (327°C) |
| Heat Deflection | 248°F (120°C) |
| Dielectric Constant | 2.1 |
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