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What are the performance characteristics of PTFE micropowder?

Edit:Guangzhou Songbai Chemical Co., Ltd.UpDate:2019-05-16

Polytetrafluoroethylene is a polymer of tetrafluoroethylene. The English abbreviation is PTFE. Polytetrafluoroethylene is widely used in various applications requiring acid and alkali resistance and organic solvents. It is not toxic to humans, but one of the raw materials used in the production process, perfluorooctanoic acid (PFOA), is considered to be carcinogenic.
Due to the high-temperature cracking, it also produces highly toxic by-products such as fluorophosgene and perfluoroisobutylene. Therefore, special attention should be paid to safety protection and prevention of contact with open flame by PTFE micropowder.
Mechanical properties Its friction coefficient is extremely small, only 1/5 of polyethylene, which is an important feature of the perfluorocarbon surface. Moreover, since the intermolecular force of the fluorine-carbon chain is extremely low, the polytetrafluoroethylene has no stickiness.
Chemical resistance and weather resistance In addition to molten alkali metal, PTFE micropowder is virtually free of any chemical attack. For example, in concentrated sulfuric acid, nitric acid, hydrochloric acid, or even boiling in aqua regia, there is no change in weight and performance, and it is almost insoluble in all solvents, and is slightly soluble in per-alkane (about 0.1 g/100 g) only above 300 °C. PTFE does not absorb moisture, is non-combustible, and is extremely stable to oxygen and ultraviolet rays, so it has excellent weather resistance.
Electrical properties PTFE micropowder has low dielectric constant and dielectric loss over a wide frequency range, and high breakdown voltage, volume resistivity and arc resistance.
Radiation resistance: PTFE micropowder has poor radiation resistance (104 rad), which is degraded by high-energy radiation, and the electrical and mechanical properties of the polymer are significantly reduced.
Corrosion resistance: It can withstand the action of all strong acids (including aqua regia), strong oxidants, reducing agents and various organic solvents other than molten alkali metal, fluorinated medium and sodium hydroxide above 300 °C.
Insulation: It is not affected by the environment and frequency. The volume resistance can reach 1018 ohm•cm, the dielectric loss is small, and the breakdown voltage is high.
High and low temperature resistance: The influence on temperature is not changed much, and the temperature range is wide. The temperature can be used from -190 to 260 °C.
Self-lubricating: It has a small coefficient of friction in plastic and is an ideal oil-free lubricating material.
Non-sticky surface: Known solid materials cannot adhere to the surface and are a solid material with a small surface energy.
Resistant to atmospheric aging.
Irradiation resistance and low permeability: long-term exposure to the atmosphere, surface and properties remain unchanged.
Non-combustibility: The oxygen limit is below 90.
The mechanical properties of PTFE micropowder are relatively soft. Has a very low surface energy.

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