PTFE (polytetrafluoroethylene) balls are versatile components used in various industries due to their chemical resistance, low friction, and thermal stability. They are available in a standard size range from 1/8 inch (3.175 mm) to 8 inches (203.2 mm) in diameter. While stock sizes may vary, custom production is possible for large quantities. Tolerances and grades further define their suitability for specific applications, with options like Virgin or Ultra-Modified PTFE catering to different performance needs.
Key Points Explained:
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Standard Size Range
- PTFE balls are manufactured in diameters spanning 1/8 inch (3.175 mm) to 8 inches (203.2 mm).
- This range accommodates diverse applications, from small precision instruments to large industrial machinery.
- For example, smaller balls (1/8–1/2 inch) are common in valves or bearings, while larger sizes (2–8 inches) may be used in heavy-duty equipment.
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Availability and Customization
- Stock availability varies by supplier, but most offer standard sizes within the above range.
- PTFE balls can be custom-produced for bulk orders, ensuring flexibility for specialized projects.
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Tolerances by Size
- Larger balls (e.g., 8 inches) typically have a diameter tolerance of ±0.005 inch and a max TIR (Total Indicator Reading) of 0.0005 inch.
- Smaller balls (e.g., 1/8 inch) have tighter tolerances of ±0.003 inch and a max TIR of 0.003 inch.
- Standard tolerance across sizes is ±5%, though precision specifications can be tailored per item.
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Material Grades
- Virgin PTFE: Pure, unfilled PTFE with excellent chemical resistance but lower wear resistance.
- Ultra-Modified PTFE: Enhanced with fillers (e.g., glass fibers, carbon) for improved mechanical properties like thermal conductivity or reduced friction.
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Applications Influencing Size Selection
- Smaller balls are ideal for sealing or low-load bearings in medical devices or lab equipment.
- Larger balls suit high-load industrial applications, such as conveyor systems or chemical processing.
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Comparative Context
- Unlike PTFE washers (which range up to 16 inches in diameter), PTFE balls are typically limited to 8 inches due to manufacturing constraints.
By understanding these factors, purchasers can select the optimal PTFE balls for their specific needs, balancing size, tolerance, and material properties. Whether for stock or custom orders, the versatility of PTFE ensures solutions across industries.
Summary Table:
| Feature | Details |
|---|---|
| Standard Size Range | 1/8 inch (3.175 mm) to 8 inches (203.2 mm) in diameter |
| Custom Sizes | Available for bulk orders |
| Tolerances | ±0.003 inch (smaller balls) to ±0.005 inch (larger balls); ±5% standard |
| Material Grades | Virgin PTFE (chemical resistance) or Ultra-Modified PTFE (enhanced properties) |
| Common Applications | Valves, bearings, medical devices, industrial machinery |
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