Polytetrafluoroethylene (poly? tetra？ Fluoroethylene (abbreviated as PTFE) is often called "non-stick coating" or "easy-to-clean material". This material has the characteristics of acid resistance, alkali resistance and resistance to various organic solvents, and is almost insoluble in all solvents. At the same time, PTFE has the characteristics of high temperature resistance and very low friction coefficient, which can be used for lubrication and become an ideal coating for easy cleaning of water pipes.

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2065438+071October 27 17 The list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization has been preliminarily sorted out for reference, and PTFE is in the list of three types of carcinogens.

Other? The propagation speed of wave in PTFE is: 2070 19667? .8 = 0.69V Note: What is the formula of wave propagation velocity meter in medium? . ? Is the dielectric constant? It's permeability.

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Polytetrafluoroethylene is called "the king of plastics", and Roy Planck 1936, the father of fluororesin? Dupont Company of the United States began to study the alternatives of freon in 1980. They collected some tetrafluoroethylene and stored it in a cylinder to prepare for the next experiment the next day. But the next day, the pressure reducing valve of the gas cylinder was opened, and there was no air leakage. They thought it was a gas leak, but when weighing the cylinder, they found that the cylinder did not lose weight. They sawed the cylinder and found a lot of white powder, which was PTFE.

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They found that PTFE has excellent properties and can be used as anti-melting gasket for atomic bombs and artillery shells. Therefore, the US military kept this technology secret during World War II. It was not decrypted until after World War II, and 1946 realized the industrial production of PTFE.