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Testing procedure and tensile stress-strain diagrams for groups of film samples in the period of 0, 1, 2, 3, and 4 months: (a) B0, (b) SP, (c) SW, (d) B1, (e) B2, (f) ECO, (g) K, (h) procedures of testing. The diagrams show that only after 3 or 4 months of decomposition a greater decrease in mechanical properties is observed.
