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It's not. Absolute alcohol is 200-proof, and is readily available, if you have the license for it. In the 1970s, I ordered 25 gallons of it for the lab I worked in, and National Distillers gave it to for free, to save the paperwork; in truckload quantities, it was something like 90c per gallon.

At 1 atmosphere, fractional distillation can produce alcohol of 95.6% which would be 191.2 proof. At lower pressure, absolute alcohol can be produced.

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Q: Why is 180 the maximum proof of alcohol?
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