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The results of investigating composite materials based on polypropylene and polyethylene terephthalate that contain different bioactive silver-containing additives developed for the production of bioactive synthetic fibres are presented. Investigations of the migration of silver from polymer fibre materials into water showed that the lowest silver concentration in aqueous abstracts is observed when cluster nanosilver is used as the bioactive additive, which provides the fibre with prolonged bioactivity at low toxicity. At present, the development of textile materials based on synthetic bioactive fibres and strands is attracting great interest, which is due to the need to protect people from pathogenic microorganisms. The main method for producing bioactive fibres and strands is to introduce into the polymer, at the stage of forming, special bioactive additives, the active agent of which acts on pathogenic microflora. On the international level, a wide range of bioadditives are on offer [1-3], either containing silver, copper, in ionic or reduced form, or based on halogen-containing (Sanitised, Acticide) or arsenic-containing (Intercide, Vinyzene) substances. The main companies producing bioactive additives for chemical fibres are Clariant (Switzerland) and BASF (Germany-Switzerland). In the Russian Federation and in countries of the CIS there is no production of bioadditives for fibres. Certain requirements are laid down for additives introduced at the forming stage: