Abstract <p>The present study concerns polymer composite materials based on polypropylene with biodegradable properties with additives of crude natural rubber and rubber tree seed oil both individually and in a mixture, which are designed to increase the biodegradation of compositions after use during the deposition process. Polypropylene (PP) produced by Omsk Polypropylene Plant LLC of the PP H 030GP 38/01-17 C30B brand was used as the object of the study. Natural rubber (NR-U) of the SMR-10 brand (Vietnam) and seed oil of the rubber tree (SIS) (Vietnam) are used as biodegradable additives. Organoleptic parameters—the smell and taste of water after the samples were soaked in it were evaluated according to SIS 22648-77. Plastics. Methods for determining hygiene indicators. The tendency of materials to water absorption was carried out according to SIS 4650-2014 ISO 62:2008. The exposure time is usually 24 h. But in this study, a water absorption test was conducted for 7 days. It was found that the introduction of destructive additives of crude natural rubber and rubber tree seed oil into polypropylene in concentrations above 15% by weight. for natural rubber and above 3% by weight. for rubber tree seed oil, as well as for mixtures of crude natural rubber with rubber tree seed oil, the studied concentration limits worsen the hygienic performance of compositions using them by one point. It will be possible to obtain more precise information about the possibility of using the studied compositions for the manufacture of products for various purposes when studying the composition of aqueous extracts. At the same time, the water absorption of composites using the studied additives is insignificant, no more than 0.8% by weight.</p>