Polytetrafluoroethylene
In chemistry, Polytetrafluoroethylene (often shortened to PTFE) is a polymer of tetrafluoroethylene. It is a fluoropolymer, because the polymerization is based on strong covalent bonds of fluorine and carbon. Polytetrafluoroethylene is not very reactive. It also repels oil and water. E. I. du Pont de Nemours and Company developed it in 1938.