??Mostly o ring will be used in Defense, chemical, coal, petroleum, metallurgy, transportation and machinery manufacturing industry, etc , and more and more popular now . O ring material became necessary accessories in all kind industry

??Sealing material should meet the requirements of a sealing function. Due to the different media to be sealed, and the different operating conditions of the apparatus, O-ring seals requires materials having different flexibility. O-ring seals to the material requirements generally:

??1) Material dense, and not divulge media;

??2) have adequate mechanical strength and hardness;

??3) compressibility and resilience, permanent deformation is small;

??4) do not soften at high temperatures, it does not decompose at low temperatures without hardening, embrittlement;

??5) good corrosion resistance, acid, alkali, oil medium, long-term work, its small size and hardness changes, and not adhere to the metal surface;

??6) low coefficient of friction, good wear resistance;

??7) having a sealing surface softness combined;

??8) Resistant to aging, durable;

??9) manufacturing convenient, cheap, drawing easy.

??Rubber is the most common O-ring seal material. In addition to the rubber, but suited to do as well as graphite O-rings and other sealing materials, PTFE and various sealants.