PET is a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface. It has excellent physical and mechanical properties in a wide range of temperatures, the use temperature can reach 120 °C, excellent electrical insulation, and even at high temperature and high frequency, its electrical properties are still good, but the corona resistance is poor, creep resistance, fatigue resistance, friction resistance, and dimensional stability are very good. PET has ester bonds, which will decompose under the action of strong acids, strong alkalis and water vapor, and is resistant to organic solvents and has good weather resistance. The disadvantages are slow crystallization rate, difficult molding processing, high molding temperature, long production cycle, and poor impact performance. Generally, the processability and physical properties are improved by reinforcement, filling, blending and other methods, and the effect of glass fiber reinforcement is obvious, and the rigidity, heat resistance, chemical resistance, electrical properties and weather resistance of the resin are improved. However, it is still necessary to improve the disadvantages of slow crystallization, and the addition of nucleating agents and crystallization promoters can be adopted. The addition of flame retardants and flame retardant dripping agents can improve the flame retardancy and self-extinguishing properties of PET.
