... of Oil SealNBRMineral oil resistance, good abrasion resistance, Use wide if oil seal, but not used in ketone and lipid polarsolventsHNBRKeep the feature of NBR, Heat Resistance, Oil ... , prevent sediment, dust, moisture and the invasion of the bearing; 2, limit the lubricating oil bearing leaks out. 3, The requirements of oil seal is size (inner diameter ...