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PTFE (polytetrafluoroethylene) is a polymer compound made by polymerizing tetrafluoroethylene (TFE) with many unique properties and a wide range of applications. PTFE is a high-performance semi-crystalline fluoropolymer known for its excellent chemical resistance, thermal stability and non-stick properties. This unique combination of attributes has led to its widespread application in diverse industries, from aerospace and automotive to cookware and medical devices.

Characteristics of PTFE

• Chemical Resistance: PTFE is resistant to almost all chemicals and does not react with any chemicals except chlorine trifluoride, elemental fluorine and molten alkali metals. This makes it ideal for use in corrosive environments.
• Thermal Stability: PTFE can remain stable at temperatures up to 260°C without significant decomposition.
• Non-stick Properties: The low surface energy of PTFE results in its well-known non-stick properties, making it a popular choice for cookware and other applications where non-adhesion is crucial.
• Electrical Insulation: PTFE is an excellent electrical insulator, making it suitable for use in the insulation layer of electrical and electronic components.
• Low Friction: PTFE has a very low coefficient of friction, usually between 0.05 and 0.10, which makes it an ideal lubricating material and is widely used in mechanical parts and anti-stick coatings.

Disadvantages and Improvement Methods of PTFE

• PTFE products have low hardness. Generally, the hardness of pure PTFE products is about 55 Shaw's, which makes the four -fluoride products not be able to withstand excessive pressure in terms of voltage resistance. In addition, PTFE's creep resistance is poor, so it needs to be processed to add some fillers to enhance performance.
• The abrasion resistance of PTFE is not ideal. Although PTFE products have extremely low friction coefficients, insufficient abrasion resistance, poor mechanical strength, and insufficient rigidity. For example, PTFE products as oil -free bearing need to be replaced frequently. This also needs to be improved by adding wear -resistant materials.
• The low surface of the PTFE material can be a double -edged sword. Although it is very helpful in textiles, glue, fluid and other methods, it also limits its industrial application, so we need to make it on the surface so that it can be bonded with other materials. PTFE surface chemical modification is currently mainly plasma treatment, radiation treatment method, and chemical solution treatment method.
• PTFE melt has a high viscosity and cannot be processed by molding method as other thermoplastic plastic. Almost every piece of components pressed a specification requires a set of molds, which increases the processing cost. Many components are often made of semi -finished products through mold pressure and extrusion methods, and then they can process the finished product.
• The thermal expansion coefficient of the PTFE is large, and its line expansion coefficient changes very regularly as the temperature changes, resulting in unsatisfactory stability of its processing size. When the container lining, it is inconsistent with the line expansion coefficient of the metal shell. Under the condition of fluid hot and cold changes and negative pressure operation conditions, PTFE lining is prone to deformed, off layers, and internal phenomena. At present, pure PTFE's precision parts are not applicable.
• PTFE is usually safe and non -toxic products, but under ultra -high temperature, it will be released with highly toxic ions when heating above 380 ° C. This needs to pay attention to ventilation safety and prevention when bright fire, welding or high temperature heating.
• Although the PTFE's electrical characteristics are very good and have excellent insulation performance, PTFE depends on sintering products, itself has extremely high static electricity. Then we need to add antistatic materials for this situation to prepare anti-static products.