20 to 50 years. According to the China Industry Network, the service life of national standard plate bearings is usually determined by the aging of rubber. Without cutting corners, the service life of rubber bearings produced can reach 20 to 50 years. The plate bearing is mainly composed of several layers of rubber sheets and thin steel plates. Each layer of rubber sheet and each layer of steel plate is inlaid, bonded, and pressure vulcanized to form a solid whole.