Other Definitions
teflon (dict)
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TeflonTeflon is the brand name of a polymer compound discovered by Roy J. Plunkett (1910-1994) of DuPont in 1938 and introduced as a commercial product in 1946. Teflon is polytetrafluoroethene (PTFE). F F | | R - C - C - R | | F F Teflon is also used as the trade name for a polymer with similar properties, perfluoroalkoxy polymer resin (PFA): F F F F | | | | R - C - C - C - C - R | | | | F F F O | F - C - F | F Teflon has the lowest coefficient of friction of any solid material known to man. It is used as a non-stick coating for pans and other cookware. Teflon is very unreactive, and so is often used in containers and pipework for reactive chemicals. Its melting point is 327 °C. Teflon is sometimes said to be a spin-off from the US space program with more down-to-earth applications; this is an urban legend, as teflon cooking pans were commonplace before Yuri Gagarin's flight in 1961. PTFE was discovered serendipitously by Roy Plunkett of DuPont in 1939, while attempting to make a new CFC refrigerant. DuPont patented it in 1941, and registered the Teflon trademark in 1944. Its first significant use was in the Manhattan Project, as a material to contain highly-reactive uranium hexafluoride, when it was known as K416. It was first sold commercially in 1946 and by 1950, DuPont were producing over a million pounds (weight) per year in Virginia. Teflon has been supplemented with another DuPont product, Silverstone, a three-coat fluoropolymer system that produces a more durable finish than Teflon. Silverstone was released in 1976. Amongst many other industrial applications, Teflon is used to coat certain types of hardened, armour-piercing bullets, so as to reduce the amount of wear on the firearm's rifling. These are often mistakenly referred to as "cop-killer" bullets on account of Teflon's supposed ability to ease a bullet's passage through bullet-proof armour. Any armour-piercing effect is, however, purely a function of the bullet's velocity and rigidity rather than a property of Teflon. Teflon exposure has been implicated in cancer, though DuPont denies any association. Teflon has excellent electrical properties especially at radio frequencies, making it eminently suitable for use as an insulator in cables and connector assemblies. Combined with its high melting temperature this makes it the material of choice as a high performance substitute for the weaker and more meltable polythene that is commonly used in low-cost applications. External links
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