PTFE billets are formed through a process involving compression molding and sintering, starting with PTFE pellets poured into cylindrical molds and compressed under hydraulic pressure. After removal from the mold, the material rests before sintering, resulting in large billets typically 1.5 meters tall. These billets are then cut into sheets or smaller blocks for further machining or processing into products like ptfe balls, seals, or tubes.
Key Points Explained:
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Formation Process of PTFE Billets
- Compression Molding: PTFE pellets are poured into a cylindrical stainless steel mold and compressed using a hydraulic press with a weighted ram. This step ensures uniform density and eliminates voids.
- Resting Period: After compression, the mold is removed, and the PTFE billet is allowed to rest. This helps relieve internal stresses before sintering.
- Sintering: The billet is heated in an oven to fuse the PTFE particles, enhancing mechanical strength and thermal stability.
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Typical Dimensions of PTFE Billets
- Standard Height: Billets are commonly 5 feet (1.5 meters) tall, making them suitable for large-scale industrial processing.
- Post-Processing: These billets can be cut into sheets, blocks, or machined into specialized components like seals, tubes, or ptfe balls.
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Applications & Further Processing
- Machining: Billets are often CNC-machined into seals with tight tolerances, available in standard and custom sizes (diameters from 1/32 to 150 inches).
- Extrusion: For tubing, PTFE is processed via paste or ram extrusion, yielding thin-walled (under 2mm) or thick-walled (2–5mm) tubes for electrical insulation.
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Material Considerations
- PTFE’s low friction and chemical resistance make it ideal for seals, bearings, and ptfe balls.
- The billet-forming process ensures high purity and structural integrity, critical for demanding applications like aerospace or medical devices.
By understanding these steps and dimensions, purchasers can better assess billet suitability for their specific machining or fabrication needs.
Summary Table:
| Aspect | Details |
|---|---|
| Formation Process | Compression molding → Resting → Sintering |
| Standard Height | 1.5 meters (5 feet) |
| Post-Processing | Cut into sheets/blocks or machined into seals, tubes, or custom components |
| Key Applications | Seals, bearings, tubing, aerospace, medical devices |
| Material Advantages | High purity, chemical resistance, low friction |
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