HENGLI brand polyester film has advantages for its high tensile strength, elastic modulus, impact strength and bending resistance, surface gloss and transparency, heat resistance (210 °C), good thermal stability, non-toxic and tasteless, good oxygen permeability and moisture resistance, chemical corrosion resistance, excellent optical properties and electrical insulating properties, such as high electrical strength of power frequency, small dielectric loss and big electrical resistivity etc. In addition, the physical performace of the film can be improved by special treatment, such as improving the surface flatness, anti static, dimensional stability, surface adhesion. BOPET film is also known as green environmentally friendly material because of its excellent comprehensive performance and can be recycled. It has a broader application prospect in the construction of a conservation oriented society today.