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Hi! According to the swedish producer of milk boxes, Tetra Pak, about 3/4 is paperboard and the last 1/4 is plastic (mainly polyethylene, but also polypropylene). In the aseptic products, they also use a thin aluminum film. Source: Tetra Pak You can read more about their use of the different commodities here: Paperboard Polymers Aluminium Hopefully this somewhat answers your questions! If it doesn't, feel free to contact us again!