Which rubber seal is used in bearing?

In bearings, the most commonly used rubber seals are nitrile rubber (NBR) seals, also known as lip seals. These seals provide Excellent protection against dirt, dust, and moisture while maintaining lubrication inside the bearing. NBR seals are favored for their durability and resistance to wear, making them suitable for various applications, including automotive and industrial machinery. Other materials like fluororubber (FKM) may also be used in high-temperature or chemically aggressive environments.