What is Polytetafluoroethylene (PTFE)?
Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene that has numerous applications.
PTFE is hydrophobic: neither water nor water-containing substances wet PTFE, as fluorocarbons demonstratemitigated London dispersion forces due to the high electronegativity of fluorine.
PTFE has one of the lowestcoefficients of friction against any solid.PTFE is used as a non-stick coating for pans and other cookware. It is very non-reactive, partly because of the strength of carbon–fluorine bonds, and so it is often used in containers and pipework for reactive and corrosive chemicals.
Where used as a lubricant, PTFE reduces friction, wear, and energy consumption of machinery.
It is also commonly used as a graft material in surgical interventions.
Applications and uses
PTFE (Teflon) is best known for its use in coating non-stick frying pans and other cookware, as it is hydrophobic and possesses fairly high heat resistance.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.
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 is also widely used as a thread seal tape in plumbing applications, largely replacing paste thread dope.
PTFE membrane filters are among the most efficient used in industrial air filtration applications. Filter coated with a PTFE membrane are often used within a dust collection system to collect particulate matter from air streams in applications involving high temperatures and high particulate loads such as coal-fired power plants, cement production, and steel foundries.
PTFE fluid lines are widely used in aviation to make fuel and hydraulic lines, due to its low resistance against flowing liquids. The colder temperatures at high altitudes cause a reduction in flow of these fluids, and coating the interior surfaces of the fuel and hydraulic lines improves flow.