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In the creation of new polymeric composite materials, the use of biologically active substances, e.g. the hydrolysis products of keratin-containing proteins of different structure, is promising. The possibility of using keratin hydrolysates as modifying additives for improving different properties of various elastomer composites is shown. These are vulcanising agents and vulcanisation accelerators for composite materials based on synthetic polyisoprene; secondary vulcanising agents for elastomer materials based on chlorine-containing rubbers; vulcanisation accelerators for composites. The use of these compounds makes it possible to remove from the composition of materials ecologically harmful components and ingredients that are produced from non-renewable sources of raw material, to solve a number of economic problems, associated, among other things, with the need for import replacement, and also to produce latex composites that in their properties approach latexes of natural rubber.