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PTFE material advantages
- Aug 17, 2018 -

High temperature resistance - use working temperature up to 250 °C.

Low temperature resistance - good mechanical toughness; 5% elongation even at temperatures down to -196 °C.

Corrosion resistant - inert to most chemicals and solvents, resistant to strong acids and bases, water and various organic solvents.

Weather resistant - the best aging life in plastics.

Highly lubricated – the lowest coefficient of friction in solid materials.

Non-adhesive - is the smallest surface tension in solid materials and does not adhere to any substance.

Non-toxic - physiologically inert, long-term implantation of artificial blood vessels and organs without adverse reactions.

Electrical insulation - can withstand 1500 volts high voltage.

The relative molecular mass of PTFE is relatively large, hundreds of thousands of low, more than 10 million high, and generally several million (degree of polymerization is on the order of 10^4, while polyethylene is only 10^3). The crystallinity is generally 90 to 95%, and the melting temperature is 327 to 342 °C. The CF2 units in the PTFE molecule are arranged in a zigzag shape. Since the radius of the fluorine atom is slightly larger than that of the carbon, the adjacent CF2 units cannot be completely cross-oriented, but form a helical twisted chain, and the fluorine atoms are almost covered. The surface of the entire polymer chain. This molecular structure explains the various properties of polytetrafluoroethylene. When the temperature is lower than 19 ° C, a 13/6 helix is formed; at 19 ° C, a phase change occurs, and the molecules are slightly untwisted to form a 15/7 helix.