Engineers facing dry-running or boundary-lubricated sliding applications often specify a low wear PTFE tube PI filled to extend service intervals without sacrificing the chemical inertness of PTFE. As a dedicated polyimide PTFE tube manufacturer, we compound high-purity PTFE resin with uniformly dispersed polyimide particles to create a void-free, stress-relieved tube that performs reliably under edge loading, high PV conditions, and rapid thermal cycling. The resulting polyimide filled PTFE tube for dry running is formulated for equipment where external lubrication is unavailable or undesirable. Its low-friction transfer film helps eliminate stick-slip in pneumatic cylinders, valve stems, and linear guides. As a PI PTFE tubing low friction option, it reduces breakaway torque by up to 40% compared with virgin PTFE in laboratory tests. Engineers also select this material as a PTFE tube with polyimide filler soft mating surface because the polyimide filler is hard enough to resist abrasive wear but will not score aluminum, stainless steel, or plastic counterfaces. Compared with bronze-filled PTFE, polyimide-filled grades reduce shaft wear by 30–50% because they do not contain hard metallic particles that can embed in soft counterfaces. Compared with carbon-filled grades, they offer better electrical insulation and lower moisture uptake. Every production batch is sintered in computer-controlled ovens with multi-zone temperature profiling, and post-sintering inspection includes laser micrometry, Shore D hardness spot checks, and Fourier-transform infrared spectroscopy to confirm filler content. Key design parameters and measured production values are provided below.
| Property | Typical Value | Test Method |
|---|---|---|
| Tensile strength | ≥ 21 MPa | ASTM D4894 |
| Elongation at break | ≥ 250% | ASTM D4894 |
| Specific gravity | 1.90–2.10 g/cm³ | ASTM D792 |
| Shore D hardness | 58–62 | ASTM D2240 |
| Dynamic coefficient of friction | 0.08–0.12 | ASTM D1894 |
| Wear rate, dry running | < 3.0 × 10⁻⁶ mm³/N·m | ASTM G99 |
| Compressive strength | ≥ 18 MPa at 10% strain | ASTM D695 |
| Linear thermal expansion | 9–12 × 10⁻⁵ /°C | ASTM E831 |
| Dielectric strength | ≥ 18 kV/mm | ASTM D149 |
| Heat deflection temperature | 120°C | ASTM D648 |
This low wear PTFE tube PI filled product is manufactured through cold compression molding followed by programmed sintering, which prevents filler agglomeration and minimizes residual stress. The tight dispersion of polyimide particles creates a hard, non-abrasive bearing surface that maintains dimensional stability after temperature cycling from -196°C to +260°C. In dry-running pump bushings, food-grade sliding guides, and automotive steering seals, low wear PTFE tube PI filled reduces friction while protecting soft mating metals from galling and fretting. It has less than 0.5% moisture absorption, excellent resistance to acids, alkalis, and most solvents, and meets FDA requirements for many food-contact applications. In accelerated wear tests against 316 stainless steel shafts, the tube showed 0.5 µm/km linear wear after 100 hours of dry oscillation at 0.3 MPa load and 0.1 m/s speed. Custom options include etched outer surfaces for adhesive bonding, flared ends, precision cut lengths, large-diameter thin-wall configurations, and private labeling with just-in-time delivery. Production is completed in-house with full traceability from raw resin to finished tube, including lot-specific test reports and dimensional inspection records.
