You may never have heard of polytetraflouroethylene (PTFE), which is quite a mouthful, but you have surely used it when you use a non-stick frying pan or saucepan coated with it. You may have also used it as sealing tape in plumbing. PTFE was invented by accident in 1938 at the American company E. I. du Pont de Nemours and Company, Wilmington, DE, by Roy Plunkett (1910–1994) who was trying to develop a new refrigerant. PTFE was patented in 1941 and in 1945 DuPont registered Teflon as its trademark for this material.
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