CPP film is cast polypropylene film, which can be divided into general CPP film and coated aluminum CPP film according to different uses. The CPP film is often used for packaging of food, daily necessities, etc., composite base material, heat sealing material, etc., with high transparency, good rigidity, thickness, low friction coefficient, and excellent heat sealing performance. Coated aluminum CPP film, after vacuum coating, can be compounded with BOPP, BOPA other base materials for high-grade packaging of tea, fried crispy food, biscuits, etc., with excellent aluminum adhesion, high gloss, low haze, low heat sealing, high heat sealing strength, and strong moisture-proof performance. The retort CPP film has excellent impact resistance at low temperature, is not easy to break, and has and juice resistance.