This heading covers hydraulic brake fluids and other prepared liquids for hydraulic transmission, e.g., those consisting of mixtures of castor oil, 2-ethoxyethanol or ethylene diricinoleate and butyl alcohol, or those composed of 4-hydroxy-4-methylpentan-2-one (diacetone alcohol), diethyl phthalate and propane-1,2-diol as well as mixtures of glycols. The heading also includes prepared hydraulic fluids based on polyglycols, silicones, or other polymers of Chapter 39. Similar liquids containing 70 % or more by weight of petroleum oils or of oils obtained from bituminous minerals are, however, excluded (heading 27.10).
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