What is the material of PET?

The chemical formula of polyethylene terephthalate is [COC6HCOOCH 2H2O] N. Polyethylene terephthalate (PET) is synthesized by transesterification of dimethyl terephthalate with ethylene glycol or esterification of terephthalic acid with ethylene glycol, and then condensed. It belongs to crystalline saturated polyester, which is milky white or light yellow, highly crystalline polymer with smooth and shiny surface. It is a common resin in life and can be divided into APET, RPET and PETG.

It has excellent physical and mechanical properties in a wide temperature range, the long-term use temperature can reach 65438 0 20℃, and the electrical insulation performance is excellent. Even at high temperature and high frequency, its electrical properties are still good, but its corona resistance is poor, and its creep resistance, fatigue resistance, friction resistance and dimensional stability are good.

Extended data

1. has good mechanical properties, the impact strength is 3~5 times that of other films, and the folding resistance is good.

2. Oil resistance, grease resistance, acid resistance, dilute alkali resistance and resistance to most solvents.

3. It can be used in the temperature range of 55-60℃ for a long time, and can withstand the high temperature of 65℃ and the low temperature of -70℃ for a short time, and the temperature has little influence on its mechanical properties.

4. The permeability of gas and water vapor is low, and it has excellent resistance to gas, water, oil and odor.

5. High transparency, blocking ultraviolet rays and good gloss.

6. Non-toxic, tasteless, good health and safety performance, and can be directly used for food packaging.

Refer to polyethylene terephthalate _ Baidu Encyclopedia?