Well, this video clears that one up 😉
These ordinary aluminum cans are concealing a devious secret – they are covered with a protective layer not only on the outside, but on the inside as well! When we remove their paint coatings, we expose the aluminum, which easily reacts with a drain cleaner that contains an alkaline component. But even when the aluminum has dissolved completely, the drinks will not leak. The cans contain a secret second material – a layer of plastic that keeps the drinks themselves from interacting with the aluminum.
Carbonated drinks contain what are known as “acidity regulators,” the most popular of which are orthophosphoric and citric acids. They are used to acidify foods, giving them a sour and slightly bitter taste. These acids can react with various metals, including the aluminum comprising the soda cans. A special plastic coating is therefore applied to the inside of the cans to prevent the two from interacting. This plastic is most often an epoxy resin (polyethylene, polypropylene, polyester, or other polymers may be used in some cases). These extremely-prevalent epoxy resins contain bisphenol A (BPA), a substance that usually evokes a mixed reaction from consumers. Bisphenol A has the ability to mimic natural human hormones; namely, it is structurally similar to estrogen. Over the past 20 years, it has undergone thorough investigation to determine any effects it may have on the human body. According to extensive research and risk assessments conducted by both governmental and independent organizations worldwide, bisphenol A is safe at normal everyday levels of exposure from food and beverage containers.
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