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What's special about the surface that doesn't let BPA to leech out? Is it a different composite used on the inner surface or does it have to do with something like how water is strong until the surface tension is broken?



At a minimum, roughing up the surface of a material will substantially increase its surface area.


> But during the manufacturing process, not all BPA gets locked into chemical bonds

Quote from the article. The plastics are polymers - monomers linked into chains, but the linking is random and this would be a plausible explanation.




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