快速撥號
加我好友
按讚追蹤
Polytetrafluoroethylene (English: Polytetrafluoroethylene,
The abbreviation is PTFE, the brand name is Teflon (the Chinese translation of the trademark, and the Taiwanese translation is Teflon)
This material is resistant to acids, alkalis, and various organic solvents, and is almost insoluble in all solvents.
At the same time, PTFE has the characteristics of high temperature resistance, and its friction coefficient is very low, so it can also be used for lubrication.
PTFE is a white solid at room temperature, with a density of approximately 2.2 g/cm ^ 3.
Its melting point is 327°C (620.6°F), but it will start to change above 260°C (500°F).
Its friction coefficient is less than or equal to 0.1, which is equivalent to a solid substance with the smallest known friction coefficient.
Chemical nature
It has excellent chemical resistance and is not corroded by acids, alkalis, oxidants and organic solvents.
Not affected by the environment and frequency, the dielectric loss is small, and the breakdown voltage is high.
The influence on temperature is not big, and the temperature range is wide. The usable temperature ranges from -190 ℃ to 260 ℃ at the highest.
It has the smallest coefficient of friction among plastics and is an ideal oil-free lubricating material.
Known solid materials can not adhere to the surface, is a solid material with the smallest surface energy.
Radiation resistance and low permeability, long-term exposure to the atmosphere, the surface and performance remain unchanged.
The limiting oxygen index is below 90.
