Definition
A trade name for polytetrafluoroethylene (PTFE), a synthetic fluoropolymer used in aviation as a low-friction, chemically inert, heat-resistant material for hose linings, seals, gaskets, electrical insulation, and bearing surfaces. Teflon resists most fuels, oils, hydraulic fluids, and solvents, and operates over a wide temperature range without breaking down.
Plain English
Teflon is a slippery, tough plastic-like material that doesn't react with most chemicals and handles high heat. In aircraft it's used wherever you need something slick, sealed, or protected from harsh fluids.
Context Anchor
Seen in aircraft maintenance when identifying materials used in seals, hose liners, wire insulation, low-friction surfaces, and protective coatings.
Derivation
Teflon is a brand name registered by DuPont in 1945 for the material polytetrafluoroethylene (PTFE), which was discovered accidentally in 1938. The name has become so common that mechanics often say 'Teflon' to mean any PTFE part, even from other manufacturers.
Why Pilots Care
Teflon parts reduce wear and prevent leaks in critical fuel and hydraulic systems where ordinary materials would degrade or seize.
Analogy
A common everyday example is the nonstick coating on cookware. In aircraft, the same general idea—low sticking and low friction—is used in more demanding places, such as insulation, seals, and protective surfaces.
Intuition Check
Do not think of Teflon only as a kitchen-pan coating. In aviation, it refers to a special low-friction, heat-resistant material used in aircraft parts and systems.
Example Sentence 1
The technician inspected the Teflon-lined hydraulic hose for kinks before reinstalling it.
Example Sentence 2
Mechanics prefer Teflon-coated bearings in control linkages because they stay smooth without added grease.