| abstract |
Heat transfer fluid comprising a freezing point depressant; an aromatic carboxylic acid or a salt thereof, an aliphatic carboxylic acid or a salt thereof, or a combination of the foregoing; an inorganic phosphate; a magnesium compound; deionized water; a component selected from the group consisting of an azole compound, a copper alloy corrosion inhibitor, a phosphonocarboxylate, a phosphinecarboxylate, a benzoate, a molybdate, a mercaptobenzothiazole, and combinations of two or more of the above components; and nitrate, said nitrate being in an amount less than or equal to 40 ppm of nitrate; wherein the heat transfer fluid is free of silicates and borates. |