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A number of variables must be considered when selecting oil seals. There are nine factors that designers and maintenance engineers must evaluate when oil seals are specified:

Outstanding resistance to mineral oils, aliphatic and aromatic hydrocarbons, as well as CHCs, concentrated and diluted acids, and weak alkalis. Excellent resistance to high temperatures (up to 200 °C) and a low temperature resistance down to -40 °C depending on the type used as well as good mechanical attributes and an exceptionally good ageing resistance make FPM a cut well above the usual synthesis natural rubbers.

-20 °C to + 130 °C

Classical oil seals consist of a metal housing that carries the dynamic sealing lip and provides the static sealing function. These are usually manufactured of elastomer material, such as ACM, Silicone or FPM. Further, since they are in contact with the surface of the rotating shaft, the lip is pressed onto the shaft surface by means of a spring ring.

O-rings are made to be elastic as they are usually stretched to fit into a groove before being compressed. You need to be careful of how you stretch the o-ring while installing it. In fact, you should stretch it more than 50%, and the stretching should be on all the sides, rather than one side.

Table 5: Major rubber materials and their operational temperature ranges

With minor lip


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Oil seals are a crucial component in any high-pressure system, serving the important role of preventing leaks and maintaining the integrity of the system. These seals are designed to withstand the high pressures typically found in hydraulic systems, engines, compressors, and other machinery where oil leakage can cause serious damage.