In high-load, high-speed bearing applications, virgin PTFE often falls short because its PV limit is too low. Upgrading to a 10% carbon PTFE bushing for dry running changes the equation by adding carbon fiber reinforcement that boosts compressive strength, thermal conductivity, and wear resistance. As a dedicated 10% carbon PTFE bushing manufacturer, we machine each bushing to tight tolerances for consistent press-fit retention and shaft alignment. The same material family is also available as a carbon filled PTFE sleeve bearing for rotating and oscillating shafts, and as a low friction carbon PTFE bushing where stick-slip must be minimized. Compared with standard PTFE, this carbon-reinforced grade delivers a meaningfully higher PV rating, making it suitable for dry-running, semi-lubricated, and boundary-lubricated conditions.
10% Carbon PTFE High-PV Bushing is engineered around a homogeneous 10% carbon fiber/PTFE compound that balances low friction with improved heat dissipation. The carbon reinforcement reduces creep under sustained load, lowers thermal expansion, and allows the bushing to survive short-term temperature spikes that would deform unfilled PTFE. This bushing is recommended for pivots, trunnion supports, pump wear rings, valve stems, and other positions where lubrication is difficult or forbidden. In dry-service tests against hardened steel shafts, the bushing maintains stable friction after the initial transfer-film break-in. Compared with bronze-backed PTFE bushings, the solid carbon-filled design offers full machinability, no corrosion from dissimilar metals, and a wider chemical compatibility window. It also resists galvanic corrosion and can be used in contact with most industrial chemicals, solvents, and mild acids, excluding molten alkali metals and elemental fluorine.
Key specification highlights include:
Nominal mechanical and thermal values are listed below for rapid engineering comparison:
| Parameter | Value | Test Reference |
|---|---|---|
| Filler content | 10% carbon fiber | Internal QC |
| Density | 2.05–2.15 g/cm³ | ASTM D792 |
| Hardness | 62–66 Shore D | ASTM D2240 |
| Tensile strength | 12–18 MPa | ASTM D638 |
| Compressive strength | 28–35 MPa | ASTM D695 |
| Tensile elongation | 120–180% | ASTM D638 |
| Thermal conductivity | 0.60–0.70 W/m·K | ASTM C518 |
| Coefficient of linear thermal expansion | 8–10 × 10⁻⁵ /°C (25–100°C) | ASTM E831 |
| Maximum continuous service temperature | 260°C | - |
| Maximum dry PV | 1.2–1.8 MPa·m/s | Internal test |
| Dynamic coefficient of friction | 0.08–0.15 | ASTM D3702 |
Recommended operating envelope for high PV duty:
The bushing performs best with shaft hardness above 40 HRC and surface roughness in the 0.2–0.4 µm Ra range. Because the compound is non-hygroscopic and dimensionally stable, it can be machined to IT7 tolerance classes with wall thicknesses from 1.5 mm upward. For high PV applications, allow adequate clearance to account for thermal expansion, and consider a grooved ID when debris evacuation or lubricant retention is required.
