Bearing PV Value

The maximum operating PV value of EPA500 plastic bearing is 0.25 N/mm²·m/s. It means the load capacity of the bearing is inversely proportional to speed. Refer to Diagram EPA500-1 for details.

Bearing Load, Speed and Temperature

The maximum static load of EPA500 plastic bearing is 90 MPa. Refer to Diagram EPA500-2 for the maximum compressive deformation of the bearing under this load. The actual working load of the bearing shall be slightly less than 90 MPa. The load capacity is also affected by operating speed and temperature. Higher speed (Vmax: 0.6 m/s) will raise frictional temperature, and temperature rise (Tmax: 250°C) will gradually reduce the bearing load capacity. Refer to Diagram EPA500-3 for the load variation with bearing operating temperature.

Friction Coefficient of Bearing

Diagram EPA500-4 shows that for EPA500 bearings under constant load, the friction coefficient rises gradually with increasing operating speed. Diagram EPXA-5 indicates that for EPXA bearings at a constant speed, the friction coefficient drops rapidly as load increases up to 20 MPa, while the friction coefficient changes mildly when the load exceeds 20 MPa. Diagram EPA500-6 shows that the recommended shaft surface roughness for EPA500 bearings is Ra 0.4~0.9 μm.

Wear and Shaft Material

Diagram EPA500-7 and Diagram EPA500-8 present test results showing the wear performance of EPA500 plastic bearings running on different shaft materials. The results indicate that hardened aluminum shafts and hard chrome shafts are suitable for this bearing under light loads. As the load increases, hard chrome shafts demonstrate particularly prominent advantages. Diagram EPA500-7 also shows that EPA500 plastic bearings are well suited for oscillating motion.

Chemical Resistance

EPA500 plastic bearings feature excellent chemical resistance and can withstand strong acids with a concentration up to 65%.

Water Absorption

EPA500 plastic bearings have a moisture absorption rate of 0.3% under standard atmospheric pressure, and the maximum water absorption when immersed in water is 0.5%. Its extremely low water absorption will not cause changes in bearing performance or dimensions, making it highly suitable for humid environments.

UV Resistance

The material properties of EPA500 plastic bearings remain unchanged upon long-term exposure to ultraviolet radiation.

Installation Tolerance

Tolerance of EPA500 plastic bearing after press fitting