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The mechanical properties of PTFE are relatively soft. Has very low surface energy. Polytetrafluoroethylene has a series of excellent performance:
High temperature resistance: long-term use temperature of 200~260 degrees;
Low temperature resistance: still soft at -100 degrees;
Corrosion resistance: can withstand aqua regia and all organic solvents;
Weather resistance: the best aging life among plastics;
High lubrication: has the smallest coefficient of friction in plastics (0.04);
Non-sticky: It has the smallest surface tension among solid materials without adhering to any substance;
Non-toxic: It is physiologically inert; it has excellent electrical properties and is an ideal C-level insulating material. A thick layer of newspaper can block the high voltage of 1500V; it is smoother than ice.
The friction coefficient of PTFE is extremely small, only 1/5 that of polyethylene, which is an important feature of perfluorocarbon surface. In addition, because the fluorine-carbon chain intermolecular forces are extremely low, PTFE is non-sticky. Polytetrafluoroethylene maintains excellent mechanical properties in a wide temperature range of -196~260℃. One of the characteristics of perfluorocarbon polymers is that they are not brittle at low temperatures. PTFE has a high density, 2.14-2.20g/cm, almost no water absorption, and the equilibrium water absorption rate is less than 0.01%. Polytetrafluoroethylene is a typical soft and weak polymer, the mutual attraction between macromolecules is small, the stiffness, hardness, and strength are small, and it will deform under long-term stress.

The ePTFE air filter membrane

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