High quality PTFE with high content of graphite and reinforced corners from continuous aramid filament. It can prevent gap extrusions within the high pressure and temperature. It has good sliding velocity, thermal conductivity and excellent resistance to chemical attack. It is recommended for piston pumps up to 500bar long service live. It can be used to seal water, sewage water, hot water, oils,greases, gases, weak acids and. alkaline solutions, abrasive media.