is using EPDM rubber or NBR rubber as the main body,compounding with a special activation of 100% pure PTFE shell in the effective part of the sealing.Its biggest advantage is the using of special bonding process fully bonded PTFE and synthetic rubber,and it has excellent overall composite.RL-5340 has both excellent corrosion resistance,non-toxic,anti-adhesive,and good flexibility and sealing properties.it reduces the gasket cold and increases anti-blow of the gasket,so makes gasket to has good rigidity strength and compression,rebound,