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BPA is used to make epoxy resins, which are used as protective linings on the inside of metal lids and containers. These linings serve an important role as they prevent corrosion of the metal and contamination of food and beverages from dissolved metals. The linings also play an important role in preserving the quality and safety of the food. While BPA is used in the lining of some metal lids of baby food, overall exposure to BPA from the lids is minor as the surface area of the lid exposed to food is small.
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