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The metal case is the exterior (or frame) of the oil seal, the principal function of which is to give rigidity and strength to the seal. The material of the case must be selected depending on the environment where the seals are to be used. Often the metal case is covered by the same rubber material used in the sealing element, which also helps seal the exterior of the oil seal in the housing bore. Common case material types are:

Selecting Quality Gaskets

Extrusion and Nibbling

What are oil seals?

Nitrile 
High wear resistance good running properties for general use