The new rise of mechanical seals in non-asbestos materials-

The new rise of mechanical seals in non-asbestos materials

　2016-12-14　　

In the development process of mechanical seals, in the past two decades, due to the reduction and banning of asbestos and asbestos-containing products, the most significant change in the field of sealing materials is that the traditional sealing materials made of shrinking asbestos fibers have gradually been Replacement of other non-asbestos inorganic or organic synthetic materials.

Since the first case of lung deposition involving asbestos was discovered in the United Kingdom in 1906, it was subsequently discovered that asbestos was one of the causes of lung cancer, mesothelioma, etc. In the nearly century since then, foreign countries have imposed stricter regulations on the one hand. The safe concentration of asbestos dust has dropped from less than 100f/cc • y in the early days to less than 50f/cc • y for chrysotile asbestos and less than lOf/cc • y for blue asbestos in most countries. On the other hand, since the 1970s, some industrialized countries such as the United States and some Nordic countries have successively formulated laws prohibiting or restricting the production and use of cotton and asbestos-containing products. Therefore, the use of asbestos-based materials has become a turning point for sealing materials.　　198.html,

Regarding the technical requirements of mechanical seals, the research and development of mechanical seals has shown two main directions (1)