O-ring is suitable for installation on a variety of mechanical equipment, in the specified temperature, pressure, and different liquid and gas media, in the static or moving state of the seal. In machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and all kinds of instruments and meters, a large number of types of sealing components. The O-ring is mainly used for static sealing and reciprocating sealing. When used for rotary motion seals, limited to low speed rotary seals. The O-ring is generally installed in the groove of the outer circle or the inner circle with a rectangular cross section. O-ring in oil, acid, alkali, grinding, chemical erosion and other environments still play a good sealing, shock absorption role. Therefore, the O-ring is the most widely used seal in hydraulic and pneumatic transmission systems.