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One of the properties required of a mixed flushing fluid used during soldering. When such a liquid is distilled, the mixing ratio of the liquid and vapor are identical at a particular temperature and composition and the boiling point is extremely high or extremely low. A mixed liquid composed of ethanol and water has an extremely low boiling point (78.3°C) at an ethanol content of 96%. Azeotropic cleaning solutions are especially useful for vapor degreasing of solder joints. Despite their high price, these solutions decrease total costs because they allow for highly efficient cleaning.