Teflon

From Wikinfo

Teflon 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).

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Teflon is also used as the trade name for a polymer with similar properties, perfluoroalkoxy polymer resin (PFA):

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Teflon has the lowest coefficient of friction of any solid material known to man. It is also 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, but actually its first significant use was in the Manhattan Project, as a material to contain highly-reactive uranium hexafluoride. It was first sold commercially in 1946.

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 has been implicated in cancer, though DuPont denies any association.

External links

• DuPont's History of Teflon
• Chemical Achievers: Roy J. Plunkett
• Dave Kopel on "cop-killers"
• Teflon is toxic to pet birds"
• Thermolysis of fluoropolymers as a potential source of halogenated organic acids in the environment
• If Teflon is nonsticky, how do they get it to stick to the pan? (from The Straight Dope)

References

• Adapted from the Wikipedia article, "Teflon" http://en.wikipedia.org/wiki/Teflon, used under the GNU Free Documentation License