good elastic-plastic,chemical stability,impemeable,lower coefficient of feiction,wear rate,good heat resistance 1.characteristics:good elastic-plastic,chemical stability,impemeable,lower coefficient of feiction,wear rate,good heat resistance. asbestoos braided packing with PTFE,dust free asbestos square(round) rope,carbon fiber PTFE packing,ramie ptfe packing(oil),ptfe with aramind fiber in ...