It has been established that the introduction of powdered cellulose, obtained by chemo-mechanical destruction from oat straw, into the composition of rubbers as a hydrosorption filler increases the conditional tensile strength of vulcanizates in comparison with samples without this filler. It was revealed that the degree of swelling of rubbers containing powdered cellulose from oat straw, the pH of the aqueous medium and the degree of mineralization have little effect.