As a specialized polyimide filled PTFE tube for dry running manufacturer, we engineer high-performance tubing that eliminates external lubrication while resisting adhesive wear in sliding contact applications. Our PI PTFE tubing low friction series reduces breakaway torque and dynamic friction in pneumatic cylinders, solenoid valves, and precision guide systems. For mating components made of aluminum, brass, or polymer-based composites, we offer PTFE tube with polyimide filler soft mating surface to prevent scoring, galling, and premature counterface wear. In high-cycle automation and heavy-duty hydraulic systems, our low wear PTFE tube PI filled delivers exceptional dimensional stability, reduced creep, and significantly longer service intervals compared to unfilled PTFE. Each production lot is manufactured under ISO 9001-certified processes, with traceable raw material certificates and full dimensional inspection reports available upon request.
Polyimide Filled PTFE Tube is produced from virgin PTFE resin compounded with a precisely controlled percentage of micronized polyimide filler, typically 15%, 20%, or 25% by weight depending on the required balance of wear resistance, compressive strength, and friction coefficient. The polyimide particles are dispersed uniformly through the PTFE matrix during a proprietary cold extrusion and sintering process, which creates a dense, homogeneous tube structure with no visible agglomerates or porosity. This composite material retains the broad chemical compatibility and wide service temperature range of PTFE while adding the load-bearing and wear-resistant characteristics of polyimide. The inner bore is smooth and consistent, supporting stable fluid flow and low-friction linear motion for shafts, cables, and piston rods. Polyimide Filled PTFE Tube is commonly used in dry-running bushings, seal backup rings, wear guides, and insulation sleeves where traditional PTFE would deform or wear too quickly under cyclic loads. Dimensional tolerances are held to ISO 13085 class M2 or tighter when required, and each shipping lot includes lot-specific hardness, tensile, and friction test data.
Key product parameters:
Typical physical and mechanical properties:
| Property | Test Method | Typical Value |
|---|---|---|
| Density | ASTM D792 | 1.95–2.10 g/cm³ |
| Tensile strength | ASTM D638 | 15–22 MPa |
| Elongation at break | ASTM D638 | 120%–180% |
| Hardness | ASTM D2240 | 58–64 Shore D |
| Dynamic coefficient of friction | ASTM D1894 | 0.06–0.12 |
| Wear factor (K) | ASTM D3702 | 3–8 × 10⁻⁷ mm³/N·m |
| Continuous service temperature | — | -100°C to +260°C |
| Thermal conductivity | ASTM C177 | 0.45–0.60 W/m·K |
| Dielectric strength | ASTM D149 | 18–24 kV/mm |
| Water absorption (24 h) | ASTM D570 | <0.03% |
Polyimide Filled PTFE Tube also exhibits excellent dimensional recovery after thermal cycling, making it suitable for cryogenic valves and high-altitude aerospace actuators. The compound can be machined with standard carbide tooling, and custom chamfers, slots, and notches are available without compromising the filler distribution. Tight process controls ensure batch-to-batch consistency in friction, wear, and hardness values, which is critical for manufacturers seeking predictable performance in serial production of medical pumps, food-processing valves, and semiconductor handling equipment.
