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aluminum can linings
Monday, May 28th, 2018 10:11 pmI didn't know that aluminum cans have polymer linings on the inside, as otherwise the aluminum would dissolve into the soda.
The Secret Life of the Aluminum Can, a Feat of Engineering
The resin is usually epoxy, but it may also be vinyl, acrylic, polyester, or oleoresin, and could even be styrene, polyethylene, or polypropylene. The mixture also requires either a solvent, so that the epoxy can cure when baked, or a photo-initiator, so that the epoxy can cure when exposed briefly to ultraviolet (UV) light. The cross-linking agent of choice for the most tenacious epoxy coating is bisphenol-A, or BPA. According to coatings specialists, roughly 80 percent of that epoxy is BPA.
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Because of BPA, everybody dances around what to call the can’s internal corrosion inhibitor. The FDA calls it a resinous and polymeric coating. At Can School, Ball employees called it an organic coating, or water-based polymer. The EPA calls it a chemical pollutant. Health researchers call it an endocrine disruptor, and a chronic toxin.
The Secret Life of the Aluminum Can, a Feat of Engineering
The resin is usually epoxy, but it may also be vinyl, acrylic, polyester, or oleoresin, and could even be styrene, polyethylene, or polypropylene. The mixture also requires either a solvent, so that the epoxy can cure when baked, or a photo-initiator, so that the epoxy can cure when exposed briefly to ultraviolet (UV) light. The cross-linking agent of choice for the most tenacious epoxy coating is bisphenol-A, or BPA. According to coatings specialists, roughly 80 percent of that epoxy is BPA.
...
Because of BPA, everybody dances around what to call the can’s internal corrosion inhibitor. The FDA calls it a resinous and polymeric coating. At Can School, Ball employees called it an organic coating, or water-based polymer. The EPA calls it a chemical pollutant. Health researchers call it an endocrine disruptor, and a chronic toxin.