The seal is a material or a part that prevents fluid or solid particles from leaking from adjacent joint faces and prevents external impurities such as dust and moisture from intruding into the interior of the machine. The storage temperature of the seal is preferably below 30 °C to avoid high temperature aging of the seal.
Although the rubber-plastic seal is small, its role has made it a basic component and accessory in the national economy, such as national defense, chemical, petroleum, coal, transportation and machinery manufacturing. It plays a very important role in the development of the national economy. In recent years, with the rapid economic growth, the rubber and plastic seal manufacturing industry has maintained a double-digit growth. The data shows that in 2011, China's rubber and plastic seal manufacturing industry scale (the above enterprises (according to the statistical statistics of the National Bureau of Statistics, sales income of more than 20 million yuan) to achieve a total industrial output value of nearly 10 billion, an increase of more than 20% year-on-year. Currently, China Rubber There are more than 150 enterprises in the plastic seal manufacturing industry (annual income of 20 million yuan). The domestic rubber sealing industry generally shows the development situation of small enterprises and low technical level. From the perspective of enterprise economic types, private and foreign capital Enterprises account for more than 95% of the industry's main economic types. At the same time, enterprises are basically concentrated in East China. From the perspective of the number of enterprises, sales revenue and asset size, East China has a considerable share and market concentration is high.