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Teflon (abbreviated as Teflon or PTFE, F4) is widely known as the king of plastics, and the Chinese transliteration is called Teflon, Teflon ，Teflon, Teflon, "eflon, Teflonand so on. Ptfe is composed of tetrafluoroethylene by polymerization of polymer compounds, it has excellent chemical stability, corrosion resistance, corrosion resistance in the world today is one of the preferred material, in addition to the molten metal liquid and sodium fluoride, ingeneral, all other chemicals in aqua regia boil also doesn't change, is widely applied to various needs the operation condition of the resistance to acid and alkali and organic solvent), sealing, high lubrication is not sticky, electric insulation and good aging resistance, large span of heat-resistant (at + 250 ℃ to 180 ℃ temperature long-term work). Teflon itself is not toxic to humans, but perfluorooctanoic acid (PFOA), one of the ingredients used in the production process, is thought to be carcinogenic. Its birth solves many problems in the fields of chemical industry, petroleum and pharmaceutical industry. It has been widely used as sealing material and filling material. Properties and advantages of ptfe High temperature resistant, use the working temperature of 250 ℃. Low temperature resistance -- good mechanical toughness; Even if the temperature drops to 196 ℃, also can keep 5% elongation. Corrosion resistance - inert, resistant to strong acids, bases, water and organic solvents for most chemicals and solvents. Weather resistance - has the priority of aging life in plastics High lubrication - low friction coefficient in solid material. Non-toxic - has physiological inertia, as artificial blood vessels and organs long-term implantation in the body without adverse reactions. Teflon gasket Polytetrafluoroethylene has many applications as a sealing material. Due to its high corrosion resistance, stable physical performance and high and low temperature resistance, it has achieved good sealing performance, which has been widely used in petroleum, chemical industry, pharmaceutical industry, electric power industry and steel industry. Suitable media include water, oil, acid solution, alkali solution and almost all chemical components. The American Othello sealing material group [2] is a well-known international sealing material manufacturer, and many of their products can be seen in the Chinese market. There are many kinds of products used in Othello. Now, taking Othello products as an example, this paper introduces the application of ptfe in sealing materials. Pure teflon gasket plate OTH-2100 Soft polytetrafluoroethylene refined from. Durable, reliable sealing performance; Polytetrafluoroethylene has superior corrosion and aging resistance, and has good creep resistance and cold flow resistance after special processing. It can be used safely in a wide range of temperature; Soft and easy to cut, can be cut mechanically or manually, easy to install; The plate is white, clean and clean, and will not contaminate the contact medium due to shedding. Appearance color: white. Applicable temperature: 180 ℃ to 250 ℃ Suitable medium: PH 0-14 Normal size: 1250mm*1800mm thick 1-5mm Users can buy the whole piece and cut the gasket by themselves according to the diameter of the flange of their own equipment. They can also put forward their own requirements to be preformed by the supplier.