Water-glycol hydraulic fluid.

摘要

A water-glycol hydraulic fluid comprising a higher aliphatic acid in a ratio of 2 to 15% by weight, alkali hydroxide in an amount less than an equivalent amount of the higher aliphatic acid, and an organic alkaline compound containing nitrogen atoms in an amount sufficient to adjust the pH of the whole fluid to 10 to 12 is desclosed. This hydraulic fluid has excellent wear resistance and also excellent sludge solubility.