Sealed with the use of expanded polytetrafluoroethylene PTFE resin, made by a specific technology has expanded mesh structure, with good toughness, high strength longitudinal and transverse deformation also easy with the excellent performance of PTFE etc., can be applied to petroleum, chemical, medicine, food and beverages, electricity, machinery, shipbuilding and other industries in a variety of pump, control valve, flange connection would like to deal with the static seals and a variety of enamel lining, glass lining, plastic lining , rubber lining, graphite lining and stainless steel, titanium steel, such as the reaction tower, reactor and heat exchangers, such as the sealing flange. Convenient.section of the seal with the required length, as long as the ends of cross-stacked, you can form a random size, the ring of arbitrary shape.