O-rings are suitable for mounting on a wide range of mechanical equipment and function in a static or moving state at specified temperatures, pressures, and in different liquid and gaseous media. In the machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and various types of instruments, a large number of types of seals are applied. element. O-rings are mainly used for static and reciprocating seals. Low-speed rotary seal for rotary motion seals. O-rings are generally mounted in a groove with a rectangular cross section on the outer or inner circle to seal. O-ring seals still have good sealing and shock absorption in oil, acid, alkali, grinding and chemical corrosion. Therefore, O-rings are the most widely used seals in hydraulic and pneumatic transmission systems. O-rings have the following advantages compared to other types of seals: - Suitable for a variety of sealing forms: static seal, dynamic seal Suitable for a variety of materials, sizes and grooves have been standardized, interchangeable - Suitable for a variety of sports: rotary motion, axial reciprocating motion or combined motion (such as rotary reciprocating combined motion) - Suitable for a wide range of sealing media: oil, water, gas, chemical media or other mixed media Effective sealing of oil, water, air, gas and various chemical media through the selection of suitable rubber materials and appropriate formulation. Wide temperature range (-60 ° C ~ +220 ° C), the pressure can be up to 1500Kg / cm2 when used in fixed use (with reinforcing ring). --Simple design, compact structure, easy to assemble and disassemble The O-ring has a simple cross-section structure and self-sealing effect, and the sealing performance is reliable. Since the O-ring itself and the mounting structure are simple and standardized, installation and replacement are very easy. --Materials are: nitrile rubber (NBR), fluororubber (FKM), silicone rubber (VMQ), ethylene propylene rubber (EPDM), neoprene (CR), butyl rubber (BU), PTFE (PTFE), natural rubber (NR), etc. --Low cost; --The dynamic friction resistance is relatively small.
O ring 
