PTFE filled product Filler graghite,carbon,glass fiber,bronze It has good corrosion resistance good hardness low friction PTFE ... resistance,by adding filler such as glass fiber,graghite,carbon,bronze.It will have good heat conductivity and low heat expansion ... for the production of washer,valve,bearing,slide,pistonring,insulating sleeve, and self-lubricating seal. Colour white,black or other ...