... 2,chemical stability impermeable 3,lower coefficient of friction high quality PTFE Packing for sealing 1.Our company: It has engaged in ... good credit. managed by standard of ISO 9001:2008,and has passed ISO14001:2004 Environment management system,GB/T28001- ... chemical stability, impermeable, lower coefficient of friction, wear rate and good heat resistance.Type of packing: asbestos braided packing with ...