O ring is a variety of mechanical equipment used in the sealing parts, because of its O section, so called O ring. Because it is simple to manufacture, stable performance, good sealing, low price, wide range of characteristics, so that it is widely used in a variety of mechanical equipment.

In a variety of applications, the O-ring is mainly used in static seals, with high pressure resistance, corrosion resistance, impact resistance characteristics. It is also widely used in dynamic sealing, but there are certain restrictions on rotation speed. O-ring in oil resistance, acid and alkali, grinding, chemical erosion and other environments still play a good sealing, damping role.

Common O-ring materials can be selected according to different fluids: nitrile butadiene rubber (NBR), fluorine rubber (FKM), silicone rubber (VMQ), ethylene propylene rubber (EPDM), chloroprene rubber (CR), butyl rubber (BU), polytetrafluoroethylene (PTFE), natural rubber (NR) and so on. Different materials have different characteristics and can be applied to different machines and environments.