PTFE (polytetrafluoroethylene) balls exhibit unique mechanical properties that make them valuable in applications requiring low friction, chemical resistance, and durability. Key properties include a low coefficient of friction (0.05–0.2), moderate tensile strength (10–40 MPa), high elongation at break (up to 400%), and hardness ranging from Rockwell D50-55 or Shore. They also demonstrate excellent impact resistance (Izod impact strength of 160 J/m) and flexibility, though they are susceptible to creep under constant pressure. These properties allow PTFE balls to perform reliably across a broad temperature range (-73°C to 204°C) and in harsh environments.
Key Points Explained:
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Friction and Wear Resistance
- PTFE balls have an exceptionally low coefficient of friction (0.05–0.2), making them ideal for applications requiring smooth motion, such as bearings or seals.
- Their wear resistance is enhanced by their non-stick surface, reducing material degradation over time.
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Hardness and Elasticity
- Hardness ranges from Rockwell D50-55 or Shore, indicating moderate resistance to indentation.
- High elongation at break (200–400%) and a Poisson’s ratio of 0.46 highlight their flexibility and ability to deform without fracturing.
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Strength and Durability
- Tensile strength ranges from 10–40 MPa, which is lower than many engineering plastics but sufficient for low-load applications.
- Impact resistance is notable, with an Izod impact strength of 160 J/m, ensuring durability under sudden stress.
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Creep and Deformation
- PTFE is prone to creep (permanent deformation under constant pressure), which can be mitigated by using reinforced designs, such as bonded rubber cores in seals.
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Thermal and Chemical Stability
- PTFE balls maintain performance from -73°C to 204°C, making them suitable for extreme environments.
- Their inert nature provides excellent resistance to chemicals and weathering.
For more details on PTFE ball applications and specifications, visit ptfe balls. These properties make them indispensable in industries like aerospace, automotive, and chemical processing, where reliability under stress and harsh conditions is critical.
Summary Table:
| Property | Value/Description |
|---|---|
| Coefficient of Friction | 0.05–0.2 |
| Tensile Strength | 10–40 MPa |
| Elongation at Break | Up to 400% |
| Hardness | Rockwell D50-55 or Shore |
| Impact Resistance (Izod) | 160 J/m |
| Temperature Range | -73°C to 204°C |
| Creep Susceptibility | High (mitigated by reinforced designs) |
| Chemical Resistance | Excellent (inert to most chemicals) |
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