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