Ethylene propylene ternary fire pipe card sealant ring, 63-65 Shaw A, 15MPA, constant pressure within 25% of the cost-effective rubber design. Fluid (gas, liquid) sealing is a necessary general technology in various industrial fields. Sealing technology is inseparable not only in construction, petrochemical, shipping, machinery manufacturing, energy, transportation, environmental protection and other industries, but also in aerospace and other cutting-edge industries. Sealing technology is applied in a wide range of fields. Sealing problems exist in all devices involved in fluid storage, transportation and energy conversion.

The importance of sealing technology seal failure results in very serious consequences, light "run, run, drip, leak" cause waste of energy and resources, the heavy will cause manipulation failure, and even fire, explosion, environmental pollution and other consequences endanger personal safety! According to preliminary statistics, more than one-third of the quality accidents of mechanical equipment and weaponry were caused by seal failure, which caused serious consequences, such as: the U.S. space shuttle Challenge propeller O-ring failure caused by aircraft destruction; Russian Soyuz spacecraft fuel capsule leak several astronauts died of fatality; After the launch of the Dongfang red 3 space satellite, the pipeline leak can not work properly. This is why the machinery manufacturers now choose high-quality sealing products at cost.





With the development of science and technology, the working conditions of sealing structure are more rigorous. Because the temperature, pressure and corrosiveness of the sealed fluid have been greatly improved, the traditional sealing materials such as felt, linen, asbestos, asbestos, ash and so on can not meet the requirements of use, and they are gradually replaced by rubber and other synthetic materials. Rubber and other synthetic materials are generally polymeric polymers. Functional groups with different characteristics (such as chlorine, fluorine, cyano, vinyl, isocyanate, hydroxyl, carboxyl, alkoxy) become active crosslinking points. Under the action of catalyst, vulcanizing agent, or high-temperature, high-energy ray, macromolecule changes from linear structure, branched structure to space network structure. This process is called vulcanization. Vulcanized rubber or other synthetic materials, macromolecules lose their original fluidity, known as elastomers with high elastic deformation. Common rubber and synthetic materials are: natural rubber, styrene-butadiene rubber, chloroprene rubber, cyanogen-butadiene rubber, ethylene-propylene rubber, butyl rubber, polyurethane rubber, acrylate rubber, fluororubber, silicone rubber and so on.