SKF POM composite thrust washers have pockets in the sliding surface, which serve as grease reservoirs and should be filled with grease prior to installation. This makes these washers suitable for applications that require minimal maintenance under difficult operating conditions, for example in contaminated environments where lubricant cannot be supplied continuously or frequently. Despite of their compact design, POM composite washers can accommodate heavy axial loads and are less sensitive to misalignment. They are suitable for slow rotational or oscillating movements.
POM composite thrust washers consists of a sheet steel backing on which a 0,2 to 0,4 mm thick layer of tin/bronze is sintered. The principal characteristic of these washers is their relatively thick (0,3 mm) covering layer of acetal resin (POM – polyoxymethylene) with additives. This covering layer has pockets to retain grease and is firmly attached to the sintered tin/bronze layer.
The thickness of the covering layer makes these washers less sensitive to misalignment and the edge loading associated with that misalignment.