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Polytetrafluoroethylene (PTFE) is a fluorocarbon plastic; that is, a plastic in which the hydrogen normally found in association with carbon in organic materials has been replaced by fluorine. This produces a number of remarkable properties, and PTFE is reputedly the most inert substance known to ma n. It was discovered and developed by Dupont, whose trade name is Teflon. PTFE is best known generally as a non-stick lining in cooking utensils and on cutting tools, and as a thread seal tape. There are a vast number of industrial uses for which PTFE is available as block, sheet, rod and tube, all of which can be machined in similar fashion to metal. PTFE film can be formed by casting, extrusion or skiving (veneering) processes. . Coating : PTFE is used in the form of water-based dispersion to coat flexible woven, and some non-woven, materials such as glass fibre cloth (usually referred to as glass cloth, or simply "glass". Only materials, which stand the very high processing, and application temperatures can be coated. A variety of techniques can be used in processing to improve the tear strength and resistance to creasing of the finished fabric, provide conductivity (anti-static properties), or resistance to oil and fats.
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