... made of F4 raw material strip after knitting(dipping) moulding PTFE packing set is made of F4 raw material strip after knitting ... environment, and easily packed and dismantled.1,featurePtfe knitting(dipping) packing set is made of F4 raw material strip after knitting ... four-fluorin,four-fluorin,carbon fibre,graphite,brass wires graphite packing set.