Seals in the working pressure and a certain temperature range, should have good sealing performance, and as the pressure increases automatically improve sealing performance. 2. The friction between the seal means and the moving element is smaller, friction coefficient to stabilize. 3. seals Corrosion resistance, not aging, long working life, good wear resistance, wear and tear to a certain extent can be automatically compensated. 4. Simple structure, easy maintenance, so that seals have a longer life. Scope: metal plastic, water supply and drainage, HVAC, fire protection, pharmaceutical, marine, and other piping systems, automobile, motorcycle ﹑ ﹑ a variety of mechanical, electronic home appliances, toys, sports equipment, etc. ﹑ pneumatic components and bathroom.