Currently, expanded PTFE seal products are mainly three kinds, namely the interface sealing tape (on behalf of the pad), stem packing and GFO fiber pump packing.

Interface sealing tape is made of expanded polytetrafluoroethylene made of white opaque shape with ribbon. It has good elasticity, toughness, compression resistance, good chemical stability, it is particularly important that easily fit in an irregular surface and pressed into a wide sheet. There are eight kinds of interfaces gasket, the maximum width of 20mm, a minimum of 3mm, the maximum thickness of 5mm, a minimum of 2mm. Expanded PTFE gasket interfaces are highly compressible, it is easy to fill cracks, holes and grooves on the sealing interface, the interface to plug the leak, and when subjected to tension has rebound and expand. Thus, the higher the pressure medium, the greater the sealing force. Now there are many domestic manufacturers use the expanded PTFE sealing material, and has achieved a good seal. After such Siping in Jilin chemical plant joint units over the years it has been unable to solve the problem of large diameter seal evaporation can, using expanded PTFE gasket interfaces, successfully resolved the problem of sealing diameter 2800mml evaporation cans of soda, and greatly reduces the seal cost.

Stem packing is composed of 100% EPTFE manufactured, prepared by the EPTFE film roll together. It also has the excellent performance of the sealing tape, and low coefficient of friction for the same temperature range -268 ℃ ~ 280 ℃, it fills easily and quickly on the worn valve stem can achieve a good seal. After the stem seal packing into the stuffing, namely compacted into high-density fill seal ring to form a precise fit of the gasket, all the various irregular pits and fissures are caused by wear and tear including Gang packing filled, wear make up defective portion of the stem and packing Yong, since the expanded polytetrafluoroethylene material unique fiber structure, provides the best adhesion and moldability, while self-lubricating and low friction coefficient, the filler is formed sealing effect can not be achieved by other materials.

GFO fiber filler pump first by expanded PTFE, graphite and high temperature lubricant blend yarn. Then braided into packing. It has also expanded polytetrafluoroethylene performance, at a pH value in the range 0-14. Chemical stability, its expansion coefficient is very small, do not wear the shaft or sleeve; good lubricity and thermal conductivity. Frictional heat can lead in time to go. So keep the stuffing inside the lower operating temperatures, to ensure the reliability of sealing; for the same temperature range -240 ℃ ~ 280 ℃; used to seal rotating shafts, wire-speed up to 21.8m / s; in the wet, hot environment.Retains its strength. It is not easy to be cut loose, graphite fiber binding one, will not fall, will not stain metal parts. Current domestic Expanded PTFE braided packing There are two major categories of products: the 100% pure expanded PTFE braided packing and processing graphite and graphite lubricant expanded polytetrafluoroethylene with braided packing.