For equipment operators and maintenance teams, the choice of bushing material has a direct impact on unplanned downtime and replacement intervals. A wear resistant PTFE bushing glass filled grade is one of the most reliable options for rotating and sliding components that run without external lubrication or in the presence of abrasive particles. The 20% glass fiber content stiffens the PTFE matrix, reduces creep under load, and creates a harder running surface than unfilled PTFE. In pump service, our 20% glass PTFE bushing for pump handles throttled suction conditions, low-NPSH episodes, and chemical exposure without swelling or scoring the shaft. For linear or oscillating movements, the glass fiber filled PTFE sleeve bearing delivers consistent friction values across a wide temperature range. As a focused 20% glass PTFE bushing manufacturer, we machine every PTFE bushing with fiberglass reinforcement from compression-molded stock, which improves dimensional stability and eliminates the internal voids sometimes found in extruded PTFE tube stock. These bushings are typically specified for pump wear rings, mixer shaft guides, valve stems, and agricultural pivots where metal bushings fail from corrosion or lack of lubrication.
The Wear Resistant PTFE Bushing Glass Filled is manufactured from a homogeneous compound of PTFE resin and 20% milled E-glass fiber by weight. The fiber is chemically sized to bond with the PTFE matrix, producing a dense structure with improved load-bearing capacity and a wear rate that is three to five times lower than unfilled PTFE under identical dry running conditions. Each bushing is compression molded under controlled pressure and then precision CNC turned or milled to the required dimensions. Standard bore tolerances are H7, outer diameter tolerances can be held to d8 or customer-specified limits, and running surfaces are finished to Ra 0.8 μm or better. End faces can be supplied square or with one or two lubrication grooves, depending on the application.
| Property | Unit | 20% Glass PTFE Bushing | Unfilled PTFE Bushing |
|---|---|---|---|
| Density | g/cm³ | 2.18–2.25 | 2.14–2.20 |
| Tensile strength | MPa | 16–22 | 25–35 |
| Elongation at break | % | 5–12 | 200–400 |
| Compressive strength at 10% deformation | MPa | 34–42 | 12–18 |
| Deformation under load at 23°C / 14 MPa / 24 h | % | 2.0–3.5 | 8–12 |
| Hardness | Shore D | 62–66 | 50–55 |
| Coefficient of thermal expansion | 10^-5/°C | 7–10 | 10–15 |
| Maximum service temperature | °C | 260 | 260 |
| Coefficient of friction | — | 0.05–0.12 | 0.04–0.10 |
| Wear rate in dry sliding | mg/N·m | 0.8–1.5 | 2.5–5.0 |
| Water absorption after 24 h | % | <0.02 | <0.01 |
Dimensional capability covers inside diameters from 5 mm to 400 mm, wall thicknesses from 1.5 mm to 40 mm, and lengths up to 300 mm for standard production, with special sizes available on request. Common configurations include straight cylindrical bushings, flanged bushings, split sleeve bearings, thrust washers, and custom wear rings with internal or external grooves. The Wear Resistant PTFE Bushing Glass Filled is widely used in chemical transfer pumps, food processing mixers, marine stern tube bearings, bottling line pivot joints, and low-speed high-load agricultural equipment. Because the material is chemically inert and FDA-compliant in many formulations, it is also suitable for incidental food contact and pharmaceutical washdown environments where external grease cannot be used.
