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2014/4/19      view:

Polytetrafluoroethylene PTFE】【TEFLON

nF2C=CF2 → —{ F2C—CF2}— 

Polytetrafluoroethylene (PTFE TEFLON) is a Thermoplastic Polymer, which is a white solid at room temperature, with a density of about 2200 kg/m3. its melting point is 600 K (327 °C; 620 °F). Its mechanical properties degrade gradually at temperatures above 194 K(−79 °C; −110 °F). PTFE gains its properties from the aggregate effect of carbon-fluorine bonds,as do all fluorocarbons. The only chemicals known to affect these carbon-fluorine bonds are certain alkali metals and most highly reactive fluorinating agents.

Polytetrafluoroethylene (PTFE) have low friction, it is used for applications where sliding action of parts is needed:Plain bearings,gears,slide plates,etc.In these applications, it performs significantly better than NYLON and POM; it is comparable to Ultra High Molecular weight Polyethylene (UHMW-PE), although UHMW-PE is more resistant to wear than PTFE, for these applications, versions of PTFE with mineral oil or molybdenum disulfide embedded as additional lubricants in its matrix are being manufactured. 

Its extremely high bulk resistivity makes it an ideal material for fabricating long-life electrets, useful devices that are the electrostatic analogues of magnets. 
PTFE is also used as a film interface patch for sports and medical applications, featuring a pressure-sensitive adhesive backing, which is installed in strategic high friction areas of footwear, insoles, ankle-foot orthosis, and other medical devices to prevent and relieve friction-induced blisters, calluses, and foot ulceration.
PTFE Sheet are used as measuring heads in spectroradiometers and broadband radiometers due to its capability to diffuse a transmitting light nearly perfectly. Moreover, optical properties of PTFE stay constant over a wide range of wavelengths, from UV down to near infrared. In this region, the relation of its regular transmittance to diffuse transmittance is negligibly small, so light transmitted through a  PTFE sheet radiates like Lambert’s cosine law. Thus, PTFE enables cosinusoidal angular response for a detector measuring the power of optical radiation at a surface, e.g., in solar irradiance measurements.
High corrosion resistance favors the use of PTFE in laboratory environments as containers, as magnetic stirrer coatings, and as tubing for highly corrosive chemicals such as hydrofluoric acid,  which will dissolve glass containers. It is used in containers for storing fluoroantimonic acid, a superacid.

PTFE tubes are used in gas-gas heat exchangers in gas cleaning of waste incinerators. Unit power capacity is typically several megawatts.PTFE is also widely used as a THREAD SEAL TAPE in plumbing applications, largely replacing paste thread dope.