polytetrafluoroethylene

/pol'ee te'treuh floor'oh eth"euh leen', -flawr'-, -flohr'-/, n. Chem.
any polymer, plastic, or resin having the formula (C2F4)n, prepared from tetrafluoroethylene, noted for its slippery, nonsticking properties, and used in the manufacture of gaskets, electrical insulation, tubing, candy molds, container linings, frying-pan coatings, etc.
[1945-50; POLY- + TETRAFLUOROETHYLENE]

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      a strong, tough, waxy, nonflammable resin belonging to the family of organic polymers, substances composed of large molecules formed by chemical combination of many small ones (monomers) into chains or networks. Known by the abbreviation PTFE or the trade name Teflon, it is distinguished by its complete indifference to attack by almost all chemicals and by its slippery surface; it retains its physical properties over a wide temperature range (-270° to 250° C, or -450° to 480° F). These qualities suit polytetrafluoroethylene to uses in gaskets, bearings, linings for containers and pipes, and parts for valves and pumps that must operate in corrosive environments and for protective coatings on cooking utensils, saw blades, and other articles.

      Polytetrafluoroethylene forms upon treating tetrafluoroethylene with oxygen; the monomer is made by heating chlorodifluoromethane at about 600°–750° C (about 1,100°–1,400° F). The chemical and physical properties of PTFE necessitate a special technique for fabricating it into solid articles: a suspension of the powder in a diluent is molded into the desired shape, the diluent is removed by evaporation, and the object is consolidated by sintering (heating to a temperature sufficient to cause the particles to adhere to each other without actually melting).

      Polymerization of mixtures of tetrafluoroethylene and hexafluoropropylene yields rubbery products that have high resistance to heat and chemical attack; these substances, called Viton, are used in gaskets and sealing devices.

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Universalium. 2010.

Look at other dictionaries:

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  • Polytétrafluoroéthylène — Structure du PTFE. Général …   Wikipédia en Français

  • Polytetrafluoroethylène — Teflon Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom. Teflon PTFE (étymologie : te de tetra et fl de fluor) est la marque déposée en 1945 du polytétrafluoroéthylène (PTFE) de la société américaine …   Wikipédia en Français

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  • polytetrafluoroethylene — noun a tough synthetic resin used to make seals and bearings and to create a nonstick coating on cooking utensils. Syn: Teflon …   Wiktionary

  • polytetrafluoroethylene — poly·tet·ra·flu·or·o·eth·yl·ene .päl i .te trə .flu̇( ə)r ō eth ə .lēn n a polymer of tetrafluoroethylene (CF2 CF2)n that is a resin with good resistance to chemicals and heat and that is used to fabricate prostheses abbr. PTFE see TEFLON * * *… …   Medical dictionary

  • polytetrafluoroethylene — [ˌpɒlɪˌtɛtrəˌflʊərəʊ ɛθɪli:n, ˌflɔ: ] noun a tough synthetic resin used to make seals and bearings and to coat non stick cooking utensils …   English new terms dictionary

  • polytetrafluoroethylene — poly·tetrafluoroethylene …   English syllables

  • polytetrafluoroethylene — /ˌpɒlitɛtrəˌfluroʊˈɛθəlin/ (say .poleetetruh.floohroh ethuhleen) noun the plastic produced by the polymerisation of tetrafluoroethylene, which has a low coefficient of friction and high resistance to temperature, chemicals, and radiation and is… …   Australian English dictionary

  • polytetrafluoroethylene — (PTFE) The major advantages of this material are its excellent chemical resistance and its extremely low coefficient of friction; automotive uses are parts where these characteristics are relevant, such as in valve stem seals, friction bearings,… …   Dictionary of automotive terms

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