Glass fiber filled PTFE sleeve bearings are widely specified in pump and rotating equipment applications where traditional bronze or virgin PTFE bushing materials fall short under edge loading. A 20% glass PTFE bushing for pump combines the low friction and chemical resistance of polytetrafluoroethylene with the rigidity of milled glass fibers, reducing cold flow and improving load carrying capacity. When service conditions involve frequent starts, dry running, or abrasive process fluids, a PTFE bushing with fiberglass reinforcement maintains shaft concentricity longer than unfilled grades. As an experienced 20% glass PTFE bushing manufacturer, we machine each sleeve bearing from compression-molded stock to reduce internal voids and fiber agglomeration. The result is a wear resistant PTFE bushing glass fille component with controlled wall thickness and smooth running surfaces for extended service intervals.
The glass fiber filled PTFE sleeve bearing is available in cylindrical and flanged configurations, with the 20% glass fiber content optimized for moderate shaft speeds and high radial loads. The glass fibers are encapsulated within the PTFE matrix, which preserves a non-stick running surface while the filler carries compressive stress and improves thermal conductivity. This product is less prone to deformation under bolt preload than virgin PTFE and is suitable for rotary, oscillating, and linear motion in pump shafts, mixer shafts, valve stems, and food processing equipment where lubrication is limited.
The glass fiber filled PTFE sleeve bearing is manufactured from a free-flowing granular PTFE compound containing 20% by weight of treated glass fibers. The compound is compression molded into tubes under controlled pressure and then sintered in high-temperature ovens to achieve a uniform, void-free structure. The resulting blanks are precision machined on CNC lathes to final dimensions, and each bearing is inspected for ID/OD tolerance, ovality, and surface finish. Glass fiber reinforcement increases thermal conductivity by roughly 2 to 3 times compared to virgin PTFE, which helps dissipate frictional heat at the shaft interface. It also lowers the coefficient of thermal expansion, reducing clearance change across temperature swings. These bearings are often installed with a slight interference fit in steel or stainless housings; the glass filler resists creep under the hoop stress, so press fits remain stable over time.
| Dimension/Parameter | Standard Range | Custom Capability |
|---|---|---|
| Inner diameter | 5 mm – 100 mm | 3 mm – 300 mm |
| Outer diameter | 10 mm – 120 mm | 6 mm – 350 mm |
| Length | 10 mm – 120 mm | 5 mm – 400 mm |
| Wall thickness | 2 mm – 25 mm | 1.5 mm – 50 mm |
| ID tolerance | H7/H9 | H6 or custom |
| OD tolerance | r6/h6 | custom press-fit |
| Surface roughness ID/OD | Ra 0.8 μm | Ra 0.4 μm |
| Concentricity | 0.05 mm | 0.02 mm |
| Chamfer | 0.5 mm × 45° | per drawing |
| Grooves | none standard | single or double spiral |
For installation, the housing bore should be prepared with a surface finish no rougher than Ra 1.6 μm, and a lead-in chamfer of 15° to 30° is recommended to avoid shaving the bearing OD during press-fit assembly. After installation, the ID may require a final burnishing or sizing operation if the interference fit reduces the running clearance below the specified value. In dry-running or grease-packed applications, the glass fiber filled PTFE sleeve bearing should be sized at the lower end of the PV range to avoid excessive wear. For wet or process-fluid lubricated service, the allowable PV increases significantly. Because the material is non-magnetic and electrically insulating, it is also used in motor bearings and pump thrust washers where eddy currents or galvanic corrosion must be avoided.
