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The nature and rate of adsorption of high-molecular substances on carbon black is of interest in a number of instances, particularly in the development of adsorption methods of fractionation of high-molecular substances, but also in the use of carbon black as a filler for rubber ; the number of papers on the adsorption of high-molecular compounds is small. The effect of the molecular weight of different polymers on the rate of adsorption of high-molecular substances from their dilute solutions at C=0.1–0.25 per cent was studied in this work. Samples of polyisoprene, polystyrene, emulsion polymerization at a temperature of +5° and +50°, and also a plant sample of SKS-30 rubber, were the objects of the investigation. Moreover, a series of polystyrene fractions was obtained by the method of fractional precipitation from methyl ethyl ketone and butyl acetate, using methanol as the precipitant. For all the polymers and their fractions the characteristic viscosity was determined, from which the molecular weight value of the polymer was determined. Carbon black of the Ukhtinsky and Dashavsky factories was used as the adsorbent, the specific surface of which was determined by the adsorption of acetic acid from a benzene solution.