1. It has good mechanical properties, with an impact strength 3-5 times that of other films, and good bending resistance. 2. Resistant to oil, fat, dilute acids, and alkalis, and most solvents. 3. The heat resistance of pure PET is not high, and the thermal deformation temperature is only around 85 ℃, but it is significantly improved after reinforcement treatment. The mechanical properties of PET reinforced with glass fibers are similar to those of engineering plastics such as PC and PA, and the thermal deformation temperature can reach 225 ℃; PET has good heat aging resistance, with a brittleness temperature of -70 ℃, and still has a certain toughness at -30 ℃; PET is not easy to burn, with a yellow flame and dripping combustion oil.