Polyester film (PET) is a film material made of polyethylene terephthalate as a raw material, made into thick sheets by extrusion, and then biaxially stretched. It is a colorless, transparent and glossy film with excellent mechanical properties, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature and low temperature resistance, chemical resistance, oil resistance, air tightness and fragrance retention. One of the commonly used barrier composite film substrates. The general thickness is 12μm, and it is often used as the outer layer material of retort packaging, with good printability.
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