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On April 6, 1938, a 27-year-old DuPont chemist named Roy Plunkett opened a cylinder of gas in his laboratory at the Jackson Laboratory in New Jersey and found something unexpected. The cylinder, which should have contained pressurized gaseous tetrafluorothylene, was empty when weighed but still felt heavy. Instead of finding gas, Plunkett discovered that the contents had spontaneously polymerized into a strange, waxy white solid coating the inside of the container. That accidental substance was polytetrafluorothylene, which is now known as Teflon.
What Plunkett was actually trying to do
Believe it or not, the discovery of Teflon was an accident. Instead of searching for a miracle material, Plunkett was working on developing new, non-toxic refrigerant gases as part of DuPont's broader chemical research program, experimenting with various fluorinated compounds. The cylinder he opened that morning had been chilled and pressurized as part of routine experimentation. Most chemists would have discarded the apparently faulty cylinder when the gas failed to flow out as expected, but Plunkett chose to investigate what had happened inside.
Plunkett observed a slick, waxy, remarkably inert white powder coating the interior. Curious to learn more, Plunkett ran a series of tests on the substance and discovered it had an extraordinary set of properties. For one, it was almost completely chemically inert, meaning it resisted reaction with nearly every acid, base, and solvent the lab threw at it. It also had an extremely low coefficient of friction, making surfaces coated with it remarkably slippery. Even more, it was stable across a vast range of temperatures.
Going commercial
DuPont patented the substance in 1941 and began producing it commercially under the trademark Teflon in 1945. Its unique chemical inertness and heat resistance made it immediately valuable in industrial and military applications. During the Manhattan Project, Teflon was used to coat valves and seals that needed to resist the highly corrosive uranium hexafluoride gas used in the uranium enrichment process.
Non-stick cookware is one of Teflon's most famous consumer applications, but it didn’t emerge until the early 1950s. Inspired by his wife's suggestion after he used a Teflon-coated fishing tackle, French engineer Marc Grégoire developed a method for bonding the material to cookware surfaces. He founded the company that became Tefal, and non-stick pans became a household staple worldwide.
Beyond the kitchen
Teflon's chemical and thermal stability made it valuable far beyond cookware. It's used as an insulating material in electrical wiring, as a coating on medical devices and implants where chemical inertness inside the human body is critical, in waterproof and breathable fabrics like Gore-Tex, and even during wartime, for revolutionary weapons of mass destruction.
Plunkett's accidental discovery is frequently cited as a textbook example of the role of unpredictability in science. Not just Teflon, but Penicillin and numerous other inventions have emerged from a curious scientist noticing something unexpected and choosing to investigate rather than dismiss it. This demonstrates an important lesson for anyone: some of your most interesting findings may come from when things don’t go as planned.
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