... -plastic 2,chemical stability impermeable 3,lower coefficient of friction high quality PTFE Packing for sealing 1.Our company: It has engaged ... ISO 9001:2008,and has passed ISO14001:2004 Environment management system,GB/T28001-2001,SGS test. 2.Characteristics: It has good ... , petrochemicals, sewage treatment, paper etc. We will offer you the high grade quality, considerate service, competitive price.