The experiments were conducted on blend film (50 mm length) prepared from starch and synthetic polymer with and without antioxidants which were placed in so – called artificial rumen for 5 days. After this time were determined decrease of dry matter of plastic, tensile strength and elongation. The addition of oxidizing substances in plastic or submission before treatment in artificial rumen processes: soaking and roasting caused decrease of plastic elasticity about 60–85%. Plastic composed on the ground of 70% of starch also characterized lower about 60% of elongation during rupture than plastic before treatment in rumen. Plastics which contained lower values of component without antioxidant and was not exposed any manipulations were more elastic in this environment. But plastics with oxidizing substance and treated (before location in rumen) processes: soaking and roasting (irrespective of composition) were characterized about 80–90% of lower resistance in comparison with plastics film placed in rumen environment. The influence of plastics degradation in rumen environment on feature mentioned above was not significant.

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