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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:
Oil leak: the most frequent failure of the oil seal
excellent, of heat oil resistant temperature can be as high as 180 ℃ to 200 ℃, widely used for high
In addition to these standardised types, the following special types are also available:
GVST