Materials of Plastic Bearing

Materials of Plastic Bearing



Phenolics is a composite materials that consist of phenolic resin, cotton fabric or other fillers. The compatibility of phenolic resins makes the bearings easy to be lubricated by various fluids.


They have replaced wooden bearings and metals such as marine propeller and rubber shaft bearings as well as electrical switch-gear, rolling mill and turbine bearings. In small instruments and clock motors, laminated phenolic can be used as both structural parts and bearing materials. They have excellent strength and impact resistance, and have the ability to resist water, acid and alkali solutions.


Some precautions must be paid some attentions. The thermal conductivity of phenolic bearings is low, so the heat generated by bearing friction cannot be easily transferred through the bearing sleeve. Therefore, larger and heavy loaded bearings must to be feed a large amount of water or lubricant to remove heat. These bearings will swell and warp at larger sizes, so they need to be larger than normal shaft clearance.



Although phenolic bearings offers excellent solutions for heavy-duty applications, they are often replaced by bearings made from Nylon, which is the most widely used in the world. Nylon bushings have low friction and do not require lubrication. Nylon bearings works quietly, wear-resistant at a low wear rate, and is easily molded, cast or machined to achieve close tolerances. Using thin bushings of material in well-supported metal sleeves, can minimize the possible problems of cold flow under high loads


Adding fillers such as graphite and molybdenum disulfide to nylon can improve the mechanical properties, rigidity and wear resistance. For ordinary nylon, the recommended maximum continuous use temperature is 80°C. For thermally stable compositions, the recommended maximum use temperature is 120°C. Filled nylon parts can resist deformation at temperatures up to 150°C.

CSB-EPB® Plastic plain bearings use high-performance plastics as the raw material, and filled high-strength fibers and special solid lubricants by the polymer compound technology to improve the anti-wear resistance of composite materials.

In the automotive industry with high durability requirements, high-speed applications, underwater applications, high temperature and anti-corrosion applications, or the food industry with FDA requirement, CSB can always provide different solutions for customers.