Thread Content
This post was last edited by Xin Ruifangxiao on 2022-6-7 at 09:56. The full name of a PTFE gasket is polytetrafluoroethylene gasket; it is also known as a PTFE gasket or Teflon gasket. It possesses excellent properties such as corrosion resistance, aging resistance, and non-conductivity. Modified PTFE gaskets are made by adding a certain amount of fillers (such as glass beads, silica, barium sulfate, etc.) to polytetrafluoroethylene resin; after mixing thoroughly at high speeds, the mixture is pressed into shape using molds, and then sintered at high temperatures to produce gaskets or other products. Alternatively, modified PTFE sheets can be first pressed into shape and then formed through stamping or cutting. The addition of fillers improves certain properties of polytetrafluoroethylene; in particular, its resistance to creep and self-lubricating properties are significantly enhanced compared to pure polytetrafluoroethylene products. Traditional PTFE materials undergo plastic deformation (creep) under long-term continuous loading, which imposes certain limitations on their application. When PTFE is used as a gasket, increasing the bolt tension to achieve a tight seal makes it more likely for the gasket to experience \"cold flow\" and creep, resulting in fluid leakage and failure of the seal. Modified PTFE gaskets utilize a unique manufacturing process and quality control procedures to enhance the sealing performance of the material, thereby minimizing the problems of creep relaxation and cold flow associated with traditional PTFE sheets. For example, modification using silica filling provides excellent chemical resistance, making it suitable for most chemical environments; it also maintains outstanding sealing performance, especially in highly acidic applications. The advantages of silica-modified PTFE gaskets are as follows: 1. Suitable for high-pressure and high-temperature operating environments ； 2. Suitable for various corrosive liquids, especially in strong acid environments (except hydrofluoric acid) ； 3. Suitable for solvents, water, steam, chlorine, carbon oxides, cryogenic substances, etc ； 4. The material boasts excellent fault tolerance, enabling the sealing of damaged or irregular flange interfaces ； 5. Suitable for fragile flanges (FRP, ceramic, plastic), pipe flanges ； 6. Quick to install, easy to remove after use, with no residue left behind ； 7. The colors are easy to identify, reducing the risk of misuse ；