Commercial grade Chrysotile Fiberglass/Acrylic yarn is impregnated with PTFE suspensoid. The final packing is again saturated with PTFE.
Interlock braided (1/8″ and 3/16″ plaited)
500 F (260 C)
1500 FPM (7.6 MPS)
A tough economical packing for valve services.