PTFE (polytetrafluoroethylene) composite material is a new type of composite material which is composed of two or more different properties or different phase materials containing PTFE, which are blended, copolymerized or combined to have better performance than the constituent materials. Through material compounding, it not only exerts the excellent characteristics of PTFE, but also overcomes the shortcomings of cold flow creep and non-wear resistance of PTFE, so that it has antifriction, wear resistance, self-lubrication, corrosion resistance, heat resistance, aging resistance and resistance. Compression, creep resistance, dimensional stability and low coefficient of linear expansion, and improved thermal conductivity and hardness, reducing costs. This new type of composite material has been used at home and abroad to make seals for special working conditions, such as high pressure, high temperature, high speed, high vacuum, flammable and explosive, toxic, highly corrosive medium, etc. These seals are widely used in petrochemical industry. In the chemical fertilizer, pesticide, aerospace, aerospace and nuclear industries, it is often used as a seal for reciprocating axial movement, such as the sealing of pistons and piston rods. It can be used for dry friction and oil-free lubrication, and oil lubrication can be carried out when conditions permit.

In order to enhance the elasticity of the PTFE composite seal, it must be combined with an elastomer, a compression ring, a convex seat, a concave seat, and various forms of metal springs to form an elastically actuated seal. The most common is metal spring actuation, which is to place a spiral flat spring or round wire spring in an annular space made by machining or molding in a sealing ring to ensure a high degree of elasticity and wear of the seal. Automatic compensation to create an excellent dynamic seal. The U-shaped seal is a balanced seal that seals both inside and outside diameter and is equipped with a support ring to protect the seal from being crushed or twisted under pressure. The sealed anti-PTFE composite material is made into a variety of small grooved gaskets, and combined with other elastic extrusion type seals to form a ring groove seal. The quality of the PTFE gasket oil seal should meet the requirements. The minimum interference is the basis for measuring the quality of the seal. Therefore, the material properties of the Teflon and the tightening spring determine the scope of application, and the working temperature and the pressure of use affect its service life. Therefore, users should pay great attention to the purchase.