The PTFE mix with carbon, when combined with ceramic, improves the coefficient of thermal expansion and wear properties, which is why it is used in the ring of non-lubricated pistons.
It is mainly used in cases that require high resistance to wear under high pressure. These include piston rings for dry compressors, bearings and mechanical retainers.
Teflon PTFE mixed with carbon ceramic is produced and supplied in the form of RODS and TUBES in different dimensions and sizes.