During the driving of the car, a lot of jitter is generated due to the mechanical vibration of the engine, the transmission itself, and the unevenness of the road surface. In order to suppress these vibrations and isolate them from the body and the cockpit, many rubber metal parts are mounted on the car. About 5% of the nearly 10,000 parts of a car are rubber components in various combinations, such as rubber suspension components (commonly known as engine mount) that connect the body to the engine and transmission, and shock absorbers. The upper seat (commonly known as strut mounts), the suspension connecting rod rubber bushing (commonly known as rubber bushings).