Selecting a polymer tubing solution for high-load, low-speed bearing applications demands a material that resists cold flow and maintains dimensional stability under compressive force. Our bronze filled PTFE tube for industrial bushing is engineered with uniformly dispersed bronze particles that raise the load-bearing capacity by up to 35% over unfilled PTFE. When the operating environment includes abrasive side loads, pairing this grade with copper filled PTFE tubing wear resistance reduces friction and prevents premature wear in rotating assemblies. As an established PTFE bronze filled tube manufacturer, we control filler distribution, sintering temperature, and post-forming tolerances to deliver consistent mechanical properties. Buying from a general metal filled PTFE tube supplier often means accepting generic blends without batch-level test data—our bronze-filled tubes are shipped with full material certification.
Bronze PTFE tube high load capacity products combine the ultra-low friction of virgin PTFE with the structural reinforcement of bronze powder. The filler content is available in 40% and 60% by weight, both of which significantly improve compressive strength, thermal conductivity, and dimensional stability under load. This self-lubricating material operates dry, eliminates stick-slip, and withstands continuous service temperatures from -200°C to +260°C.
The high load capacity of this tube comes from the bronze filler network, which transfers compressive stress away from the PTFE matrix. At 40% bronze content, the compressive modulus increases by approximately 50%; at 60% bronze content, the tube can support bearing pressures up to 14 MPa without excessive creep. This makes the product suitable for bushing, wear ring, piston seal, and pump shaft applications where metal-to-metal contact would cause galling or require external lubrication.
| Property | Test Method | Value |
|---|---|---|
| Filler content | ASTM D4745 | 40% / 60% bronze by weight |
| Density | ASTM D792 | 2.9–3.2 g/cm³ |
| Tensile strength | ASTM D4894 | 15–25 MPa |
| Elongation at break | ASTM D4894 | 100–200% |
| Compressive strength (1% deformation) | ASTM D695 | 25–35 MPa |
| Deformation under load (24 h, 14 MPa, 23°C) | ASTM D621 | <5% |
| Hardness | ASTM D2240 | 60–65 Shore D |
| Coefficient of friction (dynamic) | ASTM D1894 | 0.05–0.15 |
| Wear factor K | ASTM D3702 | 10–20 ×10-10 in³·min/ft·lb·hr |
| Service temperature | — | -200°C to +260°C |
| Dimension | Standard Range | Tolerance |
|---|---|---|
| Outer diameter | 4 mm – 300 mm | ±0.05 mm to ±0.2 mm |
| Wall thickness | 1 mm – 50 mm | ±0.05 mm |
| Length | Up to 1000 mm | ±0.5 mm |
Beyond standard dimensions, this tubing can be machined into custom flanged bushings, thrust washers, or split wear rings. Radial slotting, helical grooves, and ID chamfers are available for grease retention or debris evacuation. All products receive a visual inspection and dimensional check, with optional CMM reports for critical diameters. Because the bronze filler is distributed uniformly, machined surfaces remain smooth and do not develop soft spots under load.
Under dry running conditions, the material maintains a stable transfer film on steel or aluminum mating surfaces, which reduces both friction and noise. Typical PV limits for continuous operation range from 10,000 to 15,000 psi·ft/min, depending on filler content and mating surface finish. For intermittent or oscillating motion, the allowable load can be higher because heat generation is limited. For installation, the tube can be press-fitted into housings with a recommended interference of 0.05–0.15 mm depending on diameter. It can also be chemically bonded using epoxy or mechanically retained with snap rings. Storage in a clean, dry environment is recommended to prevent surface contamination before assembly.
