Modern industry ever-increasing demands on the reliability of sealing. Seal failure will not only cause huge economic losses

Loss, and will pollute the environment, or even lead to heavy casualties. Combustion explosion of the past 10 years of Japan's oil refining industry survey results show that, due to leakage caused by catastrophic events more than 70% of the enemy. In 1986, the U.S. space shuttle "Challenger" due to the solid booster rocket on the o-ring failure caused a fuel leak incidents of explosion caused a huge exhibition action worldwide. In recent years, many industrial countries have set up specialized research institutions, investment and a large number of human and financial resources, the sealing mechanism, sealing materials, device performance, connection design method and leak detection launched a series of studies, has made great progress.