PTFE slide bearings are engineered to accommodate movement and rotation in structural applications, with standard configurations tailored to temperature ranges and installation methods. The most common setups include 3mm PTFE bonded to an 8mm backing plate for moderate temperatures, 5mm PTFE in recessed plates for higher heat resistance, and graphite-infused PTFE for extreme temperatures. Installation flexibility (bolting, welding, or embedding) and minimal maintenance further enhance their practicality.
Key Points Explained:
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Standard Configurations by Temperature Range
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3mm PTFE + 8mm Backing Plate:
- Ideal for environments up to 130°C.
- Bonded construction ensures stability under moderate loads.
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5mm PTFE in Recessed Plate:
- Handles temperatures up to 200°C.
- Recessed design reduces PTFE creep risk by limiting exposed surface area.
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5mm Graphite-Reinforced PTFE in Recessed Plate:
- Withstands 400–500°C, suitable for high-heat industrial applications.
- Graphite additives enhance thermal stability and reduce friction.
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3mm PTFE + 8mm Backing Plate:
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Installation Methods
- Bolting: Quick assembly/disassembly; requires pre-drilled plates.
- Welding (Tack/Full): Permanent fixation; ideal for seismic or high-vibration zones.
- Mortar Embedment: Used in concrete structures for uniform load distribution.
- Consideration: Choice depends on structural requirements and accessibility for future maintenance.
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Design Variations for Movement
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Flat Stainless Steel Plates:
- PTFE interfaces with reduced contact area to mitigate creep.
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Curved Surfaces:
- Accommodates rotations >5 degrees, common in bridge bearings.
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Flat Stainless Steel Plates:
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Maintenance Advantages
- Maintenance-Free: No lubrication needed; PTFE’s self-lubricating properties endure.
- Debris Checks: Occasional inspections ensure sliding surfaces remain unobstructed.
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Customization Potential
- For non-standard applications, custom PTFE parts can be tailored to specific load, temperature, or movement requirements.
These configurations reflect a balance of material science and practical engineering, ensuring reliability across diverse structural challenges.
Summary Table:
| Configuration | Temperature Range | Key Features |
|---|---|---|
| 3mm PTFE + 8mm Backing Plate | Up to 130°C | Bonded construction for stability under moderate loads. |
| 5mm PTFE in Recessed Plate | Up to 200°C | Recessed design reduces PTFE creep risk. |
| 5mm Graphite-Reinforced PTFE | 400–500°C | Graphite additives enhance thermal stability and reduce friction. |
| Installation Methods | N/A | Bolting, welding, or embedding for flexibility and permanence. |
| Maintenance | N/A | Self-lubricating; occasional debris checks ensure longevity. |
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