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In this paper, starting from some samples built from polypropylene honeycomb core (with the thickness of 10, 15 and 20 mm) reinforced with steel wire mesh, I have determined the breaking strength by using the homogenization and Strength of Materials theories. Also, I have presented the macroscopic shape of the transversal breaking section. In the end I have inserted some new formulas, using the regression analysis, to determine the breaking strength depending on the sample thickness.