it is a kind of braided packing made of white asbestos. after braiding, this packing is impregnated with p.t.f.e. dispersion.it is suitable for sealing stuffing boxes on rotary, alternative-motion shafts, medium index acids and alkalis, etc.p.t.f.e.-a203 is a kind of asbestos packing that is treated with a special lubricant.