PTFE fiver packing is a pure PTFE fiber yarn packing braided into square cross section and impregnated with PEFE dispersion.high cross-sectional density and structural strength, inert to almost all chemicals and has great resistance to mechanical attack. Low coefficient of friction results in easy shaft running.long service duration is ensured as PEFE yarns a re stable and there is no lubricant squeezed our under operating pressure.