FIELD: machining of metals, particularly, cutting of metals. SUBSTANCE: fluid contains, wt. %: product of neutralization of wastes of selacic acid production with triethanolamine, 1.5-3; copper salt selected from group including chloride, nitrate, sulfate, 0.2-0.3; potassium permanganate, 0.03-0.04; water, the balance. EFFECT: increased lubrication capacity, higher productivity of machining process, reduced consumption of cutting tools. 1 dwg, 1 tbl
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