It is a braided packing made of PTFE yarn containing graphite．It is recommended for shafts for almost alI chemicals．Stability and long service lift are achieved by low friction coefficient．It has great tear strength and high thermal conductivity．This selflubrication packing does not score the shaft and minimizes sleeve rep;acement cost．It can be used to seal alkalis。solvents，water,steam，acids except strong oxidizing acids(aqua regia，fuming nitric acid，fuming nitric acid，fuming sulfuric acid，etc．)for centrifugal pumps，autoclaes，agitators mixers．etc．