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).

    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 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 (http://www.dupont.com/teflon/newsroom/history.html)
• Chemical Achievers: Roy J. Plunkett (http://www.chemheritage.org/EducationalServices/chemach/pop/rjp.html)
• Dave Kopel on "cop-killers" (http://www.nationalreview.com/kopel/kopel200403010926.asp)
• Teflon is toxic to pet birds" (http://www.ewg.org/reports/toxicteflon/)
• Thermolysis of fluoropolymers as a potential source of halogenated organic acids in the environment (http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v412/n6844/abs/412321a0_fs.html)
• If Teflon is nonsticky, how do they get it to stick to the pan? (http://www.straightdope.com/classics/a4_173.html) (from The Straight Dope)

de:Polytetrafluorethen fr:Teflon he:טפלון nl:Teflon ja:テフロン pl:Teflon fi:Teflon sv:Teflon