Polytetrafluoroethylene (Poly tetra fluoroethylene), English abbreviation is PTFE, commonly known as "plastic king", brand name Teflon®, in China, due to pronunciation, the trademark "Teflon" is also called Teflon, iron Flon, Teflon, Teflon, Teflon, etc., are all transliterations of Teflon.

PTFE is known as the "King of Plastics". Roy Plankter, the father of fluororesin, began to research Freon substitutes at DuPont in the United States in 1936. They collected part of tetrafluoroethylene and stored it in steel cylinders to prepare for the second. On the next day, the next experiment was carried out, but when the pressure reducing valve of the cylinder was opened the next day, there was no gas overflow. They thought it was a leak, but when the cylinder was weighed, they found that the cylinder did not lose weight. They sawed open the cylinder and found a large amount of white powder, which was Teflon.

They found that polytetrafluoroethylene has excellent properties and can be used in anti-fuse sealing gaskets for atomic bombs, artillery shells, etc., so the US military kept the technology secret during World War II. It was not decrypted until after the end of World War II, and the industrial production of PTFE was realized in 1946.