It is a braided packing made of pure PTFE thin yarn fiber,almost complete chemical inertia,dimensional stability,low friction coefficient to compression,and excellent resistance to compression are qualities classifying this packing among the best once available in the industrial filed. It is suitable for all the chemical compounds(excepting cast alkaline metals and the gaseous fluorine),alternative and rotary motions shafts operation at low peripheral speed,rods,pistons valve stems,expansion joints,etc.