Barely Significant

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Tensile Strength With the increase in rotational speed of the extruder screw in the studied range of variability, it was observed that the values of tensile strength of the film in longitudinal direction show an increasing trend in the case of polyethylene, polylactide and plastic based on potato starch, while for the material based on corn starch it decreases ( Figure 14 ).
All of the obtained values were in the range between 2187 ± 2 kg/m 3 (BM) and 2378 ± 3 kg/m 3 (25FNSW), and, after analyzing them, an overall trend can be noted as: The higher the FNSWA amount, the higher the density of concrete, see Figure 4 .