Modern industry on the reliability of the seal of the increasingly high demand. Seal failure will not only cause huge economic losses

Loss, and will pollute the environment, or even lead to heavy casualties. Japan's oil refining industry for nearly 10 years, the combustion explosion survey results show that 70% of its disastrous things over the enemy is caused due to leakage. In 1986, the United States, "Challenger" space shuttle solid rocket booster on the result of an o-ring failure, resulting in a fuel leak and explosion incident drew worldwide huge exhibition action. In recent years, many industrial countries, the establishment of specialized research institutes, investment and people a lot of manpower and money on sealing mechanism, sealing materials, components, performance, connectivity, design methods and leak detection launched a series of studies, has made great progress.