Some bearing retainers or bearing cages are made of metals such as heat-treated aluminum, solid bronze, or pressed steel. Others are made of non-metal materials such as nylon, PTFE, or phenolic resins ...

Unfilled Raw materials or unfilled resins do not contain any additional modifiers such as fillers, colorants, dispersants, plasticizers, wetting agents, levelers, or defoamers. These products are used ...