... asbestos yarns impregnated with PTFE dispersion . Asbestos braided packing with PTFE without oil Braided asbestos yarns impregnated with ... . It is a flexible, resilient,homogeneous and compact packing .Used in pumps and valves for various kindsof chemicals ... (acid, alkali, oil, steam, ammonia, etc),such as sealing stuffingboxes on rotary, alternativemotion shefts, valves for coolants, medium index ...