What Is The Difference Between Pe Gasket And Ptfe Gasket


    The chemical structure of PTFE gasket is similar to that of Pe Gasket , except that all hydrogen atoms in polyethylene are replaced by fluorine atoms. Due to the high bond energy and stable performance of the CF bond, it has excellent chemical resistance and can withstand all strong acids except molten alkali metals, fluorinated media, and sodium hydroxide above 300°C, as well as strong oxidants and reductions. The role of the agent and various organic solvents; the F atom in the PTFE molecule is symmetrical, and the two elements in the CF bond are covalently bonded. There are no free electrons in the molecule, making the whole molecule neutral, so it has excellent dielectric properties , And its electrical insulation is not affected by environment and frequency. Its volume resistance is greater than 1017 Km, low dielectric loss, high breakdown voltage, good arc resistance, and can work in an electrical environment at 250 ℃; because there is no hydrogen bond structure symmetry in the PTFE molecular structure, it is crystallized The temperature is very high (generally 55%~75% crystallinity, sometimes as high as 94%), which makes PTFE excellent in heat resistance. Its melting temperature is 324℃, decomposition temperature is 415℃, and the maximum use temperature is 250℃. The temperature is -190℃, and the heat distortion temperature (under 0.46MPa) is 120℃.

    PTFE has good mechanical properties, and PTFE has low strength, poor wear resistance, and poor creep resistance. Usually, some inorganic particles, such as graphite, molybdenum disulfide, aluminum oxide, glass fiber, and carbon fiber are added to PTFE polymer. Etc. to improve its mechanical properties; it can also be used with other polymers such as polyphenyl ester (PHB), polyphenylene sulfide (PPS), polyether ether ketone (PEEK), polyperfluoro (ethylene/propylene) copolymer (PFEP) ) And other blending methods to expand its damping temperature range and improve its creep resistance. Because rubber, glass, metal alloys and other materials have defects in corrosion resistance, it is difficult to meet the harsh conditions of the environment where temperature, pressure and chemical media coexist, and the losses caused by this are quite shocking. With its excellent corrosion resistance, PTFE has become the main corrosion-resistant material in the petroleum, chemical, textile and other industries. Its specific applications include: conveying pipes, exhaust pipes, steam pipes for transporting corrosive gases, high pressure oil pipes of steel rolling mills, high, medium and low pressure pipes for aircraft hydraulic systems and cold press systems, distillation towers, heat exchangers, kettles, towers, and tanks Lining, valves and other chemical equipment.

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