Materials

SKF polymer ball bearings can be manufactured from a variety of materials and material combinations. The selected materials depend on the application conditions. Polymer thrust ball bearings are available in the four standard material combinations listed in table 1. It is possible to meet the requirements for most applications with these standard materials. Other materials are available on request (→ Designation system).

Chemical resistance

Most polymers can resist the damaging effects of commonly used chemicals (table 2):
  • Polypropylene (PP) resists acids, alkalis, salts and salt solutions, alcohols, oils, greases, waxes and many solvents. However, exposure to aromatic compounds and halogenated hydrocarbons cause the material to swell. PP also does not resist strong oxidizing media such as nitric acid, chromates or halogens.
  • Polyoxymethylene (POM) resists weak acids, weak and strong alkalis and organic solvents, and gasoline, benzene, oils and alcohols.
  • Polyamide 66 (PA66) resists almost all organic solvents, and some weak acids and alkalis.
For additional information, refer to Factors influencing bearing performance.
SKF logo