Teflon PFA, like all fluorocarbons, exhibits its properties from the polymerization effect of carbon-fluorine bonds. The only chemicals known to affect these carbon-fluorine bonds are highly reactive metals such as alkali metals and, at higher temperatures, metals such as aluminum and magnesium, and fluorides such as xenon difluoride and cobalt fluoride. Today, I will mainly learn about the properties of Teflon PFA.
Physical properties of Teflon PFA:
Teflon PFA is a white solid at room temperature with a density of approximately 2.2 g/cm3. According to DuPont, it has a melting point of 327°C (620.6°F), but deteriorates above 260°C (500°F). Its friction coefficient is less than or equal to 0.1, which is the smallest known solid substance. The mechanical properties of Teflon PFA are softer. Has very low surface energy.
Chemical properties of Teflon PFA:
Corrosion resistance: It can withstand the action of all strong acids (including fluoroantimonic acid, aqua regia), strong alkalis, strong oxidants, reducing agents and various organic solvents except molten alkali metals, fluorinated media and molten strong alkalis.
Insulation: not affected by the environment and frequency, the resistivity can reach 1018 ohm·cm, the dielectric loss is small, and the breakdown voltage is high.
High and low temperature resistance: little change in temperature, wide temperature range, usable temperature -190~260 ℃.
Self-lubricating: It has the smallest friction coefficient among plastics and is an ideal oil-free lubricating material.
Surface non-stick: None of the known solid materials can adhere to the surface, and it is a solid material with the smallest surface energy.
Atmospheric aging resistance, radiation resistance and low permeability: long-term exposure to the atmosphere, the surface and properties remain unchanged.
Incombustibility: The oxygen limit index of Teflon PFA is below 90.
