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When cleaning a heavily soiled surface, for example asphalt or tar, it is common to use a hydrocarbon-based cleaning agent. Requirements for the emulsifier system today are effective cleaning and rapid de-emulsification of the emulsion. Hoesch Blend 791 causes a fast and spontaneous separation as well as a very good washing effect. The product can be used in highly aromatic as well as in aromatics-free hydrocarbons. The recommended addition is up to 3%. In de-aromatized hydrocarbons the concentration must not be less than 3%, as the solubility deteriorates at too low a concentration. concentration deteriorates.