Polytetrafluoroethylene
Accidentally discovered fluoropolymer used widely for non-stick and chemical resistance.
Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer of tetrafluoroethylene, valued for its heat resistance, chemical inertness, and exceptionally low coefficient of friction. As a high-molecular-weight fluorocarbon solid composed entirely of carbon and fluorine, it is hydrophobic, resisting wetting by water or water-based substances due to the low electric polarizability of fluorine, which results in only small London dispersion forces. Its most recognized brand name is Teflon, originally developed by DuPont and now manufactured by its spin-off, Chemours. The compound was accidentally discovered in 1938 by Roy Plunkett at DuPont’s Chambers Works plant in New Jersey, after a pressure bottle containing tetrafluoroethylene gas stopped flowing prematurely; sawing the bottle open revealed a waxy, slippery white coating, later identified as polymerized perfluoroethylene, catalyzed by iron from the container. Kinetic Chemicals patented the plastic in 1941 and trademarked Teflon in 1945. An early critical application was in the Manhattan Project, where PTFE coated valves and seals handling highly reactive uranium hexafluoride at the K-25 enrichment plant. By 1948, DuPont was producing over two million pounds of Teflon annually in Parkersburg, West Virginia. In 1954, French engineer Marc Grégoire, urged by his wife Colette, applied the material to cooking pans, creating the first non-stick cookware under the brand Tefal. In the United States, Marion Trozzolo marketed the first PTFE-coated pan, “The Happy Pan,” in 1961. PTFE is also used as a lubricant to reduce friction and wear, as a coating on catheters, and in its expanded form (ePTFE) for surgical grafts and implants in cardiac, vascular, hernia, and facial plastic surgery. PTFE and its production chemicals are among the best-known per- and polyfluoroalkyl substances (PFAS), which are persistent organic pollutants. DuPont used perfluorooctanoic acid (PFOA) in production for decades but discontinued it after legal actions over its health and environmental effects; Chemours now uses an alternative PFAS called GenX, which, while designed to be less persistent, may be equally or more harmful.
- discoverer
- Roy J. Plunkett
- type
- Synthetic fluoropolymer
- brand_name
- Teflon
- known_for
- Non-stick coating, low friction, chemical inertness
- coefficient_of_friction
- 0.05 to 0.10
Lore & Background
Polytetrafluoroethylene (PTFE) appears as a white, waxy, and solid material that is notably slippery to the touch. It is a fluorocarbon solid, a high-molecular-weight polymer composed entirely of carbon and fluorine atoms. Its defining characteristics include extreme heat resistance, chemical inertness, and one of the lowest coefficients of friction of any known solid. PTFE is hydrophobic, meaning water and water-based substances do not wet its surface, a property arising from the low electric polarizability of fluorine, which results in only small London dispersion forces. The material is also non-reactive, largely due to the exceptional strength of its carbon–fluorine bonds. PTFE is found in a wide range of habitats and applications, from household cookware as a non-stick coating to industrial settings where it lines containers and pipework for handling reactive and corrosive chemicals. It serves as a lubricant to reduce friction, wear, and energy consumption in machinery. In medicine, it coats catheters and, in its expanded porous form (ePTFE), is used as a graft material for surgery, including cardiac and vascular reconstruction, hernia repair, and facial plastic surgery. PTFE is also applied as a fabric treatment for stain and water resistance under the brand name Zepel. Its range extends from common kitchen pans to critical components in the Manhattan Project, where it coated valves and seals in pipes handling highly reactive uranium hexafluoride at the K-25 enrichment plant in Oak Ridge, Tennessee.
Reader's Guide
Polytetrafluoroethylene is significant for its unique combination of properties: extreme chemical inertness, heat resistance, low friction, and hydrophobicity. These qualities made it indispensable in industries from aerospace to cookware. Its use in the Manhattan Project demonstrated its value for handling corrosive materials, while its application as a non-stick coating revolutionized cooking. PTFE is also used in medical devices such as catheters and surgical grafts. However, PTFE and its production chemicals are part of the PFAS family, which are persistent organic pollutants. DuPont used perfluorooctanoic acid (PFOA) in production for decades, later discontinuing it due to legal actions over health effects. Its spin-off Chemours now uses GenX, another PFAS, which may be equally harmful. PTFE's legacy includes both technological advancement and environmental concerns.
Did You Know?
- PTFE has one of the lowest coefficients of friction of any solid, measuring 0.05 to 0.10 against polished steel.
- PTFE is the only known surface to which a gecko cannot stick, due to its resistance to van der Waals forces.
- DuPont used perfluorooctanoic acid (PFOA) in PTFE production for decades, later replacing it with GenX due to legal actions over health effects.
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