... of pumps, valves and flange etc.Pure asbestos packing, asbestos packing with PTFE impregnated, asbestos PTFE packing with oil and asbestos packing with graphite coated.Material: Asbestos yarn ... valves sealing medium as alkali solution, viscous liquid (e.g. oil), water, steam, gas, hot water, and salt solution etc. PTFE asbestos packing without oil