Traditional paper milk cartons are not made solely of paperboard; they are lined on both the inside and outside with thin layers of polyethylene plastic and sometimes aluminum foil to make them waterproof and airtight. As these cartons undergo handling, temperature changes, and pouring, microscopic polymer particles and nanoplastics can potentially shed into the liquid contents. While paper cartons are often marketed as a eco-friendly alternative to hard plastic jugs, the plastic coatings inside them mean they are not entirely free of synthetic materials or microplastic shedding potential.
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