process for the schlammbildung measures aimed to prevent and to prevent the verbleichung colors in a refined petroleum gefuellten at least partially transparent liquid

摘要

An oil-soluble substance (A) which absorbs UV and short-wavelength visible light =4500 A is added to refined mineral oils to prevent formation of sludge and bleaching of markings inside oil level indicators, etc. by the action of light. (A) is pref. a deriv. of benztriazole, esp. a 2-hydroxyphenyl benztriazole derivs., in amount of 0.1-5 wt. % of the oil. The process is suitable for use in electrical equipment e.g. oil filled switches and transformers situated outdoors, and the colour and electrical props of the oil are not adversely affected while heat resistance may even be improved.