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Properties of Teflon and Tefzel.

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Introduction

Properties Tefzel Tefzel is used in underfloor heating to protect the heating compound. Mostly used for undercarpet heating because more pressure is applied on to it. Tefzel is a fluoropolymer which are part of the fluorine-based products that include Teflon(PTFE), Teflon(FEP) and Teflon PFA fluoropolymer resins. Tefzel can be described as a ragged thermoplastic with an outstanding balance of properties. Mechanically, it is tough, has a medium stiffness and is impact and abrasion resistance. The Tefzel used in under floor heating has a higher tensile strength, stiffness , and creep resistance than other unfilled grades. Tefzel is typically considered to have a no load continuous use temperature of 150C. In certain specific applications, Tefzel can have an upper service temperature in excess of 230 C. Tefzel is weather resistance making it safe to be used in under carpet heating to insulate the heating compound. Tefzel is also inert to most solvents and chemicals and is hydrolytically stable. It has has substantially better resistance to radiation than Teflon but is not immune to damage by long-term exposure to gamma radiation, especially at elevated temperatures. Electrically, Tefzel is an excellent low-loss dielectric, with a uniformity of electrical properties not normally found with other thermoplastics. Tefzel can perform successful in applications where other materials are lacking in mechanical toughness, broad thermal capability, ability to suffer severe environmental conditions, or limited by fabricating problems.Tefzel is less dense, tougher, stiffer and exhibits a higher tensile strength and creep resistance that Teflon PTFE resins, it is however similarly ductile. ...read more.

Middle

In 1990, U.S. President George Bush presented the National Medal of Technology to DuPont for the company's pioneering role in the development and commercialization of man-made polymers over the last half century. The citation lists Teflon(r) fluoropolymer resin as one of these special products. Dr. Roy Plunkett (1911-1994) has been recognized the world over by scientific, academic and civic communities. He was inducted into the Plastics Hall of Fame in 1973, and, in 1985, into the National Inventors' Hall of Fame joining such distinguished scientists and innovators as Thomas Edison, Louis Pasteur and the Wright Brothers. The spirit of invention with DuPont fluoropolymers that was led by Dr. Plunkett is commemorated globally with the DuPont Plunkett Awards For Innovation With Teflon(r). General Properties Teflon(r) mechanical properties are low compared to other plastics, but its properties remain at a useful level over a wide temperature range of -100�F to +400�F (-73�C to 204�C). Mechanical properties are often enhanced by adding fillers (see paragraph below). It has excellent thermal and electrical insulation properties and a low coefficient of friction. PTFE is very dense and cannot be melt processed -- it must be compressed and sintered to form useful shapes. Filled Grades PTFE's mechanical properties can be enhanced by adding fillers such as glass fibers, carbon, graphite, molybdenum disulphide, and bronze. Generally, filled PTFE's maintain their excellent chemical and high temperature characteristics, while fillers improve mechanical strength, stability, and wear resistance. ...read more.

Conclusion

It has an outstanding retention of properties after aging, even at high temperatures and in the presence of solvents, oils, oxidizing agents, ultraviolet light, and other environmental agents. Because they do not use any leachable or degradable stabilizing additives, fluoropolymers offer an important safety advantage when designing products for long service life. PTFE is an extaordinary material. Some say that it is the most useful material known to man. This is because it has a combination of properties that are very hard to find. Its four great properties are: 1. very low coefficient of friction, 2. highly inert, 3. high melting point, 4. wonderful electrical properties. These properties are due to its unique molecular structure. As you can see, PTFE is composed of carbon and fluorine. Carbon-fluorine and carbon-carbon bonds are among the strongest in single bond organic chemistry. This accounts for many of its properties. Because of the strong bonds, much thermal energy must be used to break down the material. It is also nonpolar; this leads to its chemical inertness, as the diagram demonstrates, and the fact that its electrical resistance is over 1018 . The low coefficient of friction of Teflon results from low interfacial forces between its surface and another material and the comparatively low force to deform. Biography Speedheat International: Underfloor Heating Company. Manufacturers of heating element Warm Up: Underfloor Heating Company Du Pont: Manufacturers of Tefzel and Teflon which is a registered Trademark American Wire Suppliers LTD Hoch Tief GMBH ...read more.

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