

ERIKS type M (type B according to the DIN standard) has a single metal casing and rubber sealing lip. Since the casing is made of metal, it must be fitted in a well-finished, undamaged groove. Large volumes of oil seals with metal casings are often cheaper, which is why they are often used as original equipment in machines. However, if an oil seal has to be replaced, types with a rubber exterior (type R or RST) are easier to fit. Type MST is similar to M and commonly used. The difference is the dust lip in the MST oil seal that prevents dust and dirt reaching the sealing lip, and extends its service life in dusty environments.
rubber or polymer


Does it mean the seal stops the leakage completely? Well, on the practical grounds yes because there is no ‘visible leakage’.
WHICH MATERIALS MAKE UP SEALS?
Also, sealant should never be used on the housing and the installation guidelines, as discussed earlier, should be followed.
Synthetic Blend Motor Oil
Guide to oil seals for your application
