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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