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Disinfectants are usually mostly alcohol, Ethanol to be exact. Ethanol can only reach a purity degree of 95-96 percent in liquid form, with purer solutions existing only as a gas.

70 percent alcohol is sufficient to kill the bacteria, and a higher purity would not have any beneficial effect.

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12y ago
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Q: Why 70 percenet is used instead of 100 percent as disinfectant?
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