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Why is polytetrafluoroethylene used in nonstick cookware and self-lubricating bearings?
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major industrial polymers
Figure 1: The linear form of polyethylene, known as high-density polyethylene (HDPE).
Polytetrafluoroethylene (PTFE) is uniquely suited for nonstick cookware and self-lubricating bearings due to its exceptional physical and chemical properties.
The polymer consists of a carbon chain surrounded by a protective sheath of fluorine atoms, which creates very strong carbon-fluorine bonds. This structure results in several key characteristics:12
- Low Coefficient of Friction: PTFE possesses the lowest coefficient of friction of any known solid. This extreme slipperiness allows it to function as a self-lubricating material in bushings and bearings, eliminating the need for external lubricants.12
- Chemical Inertness: The material is resistant to attack by almost all chemicals, making it highly durable in industrial applications.12
- High Thermal Stability: PTFE has a very high melting point, allowing it to maintain its integrity under high-temperature conditions.12
In cookware, these properties provide a surface that prevents food from sticking without the need for fats or oils. For industrial use, its combination of slipperiness and chemical resistance makes it ideal for components like valves, pumps, and pipe liners.12