In this study, influences of zinc borate treatment on some technological properties of oriented strandboard (OSB), from aspen wood (Populus euroamericana cv.) were evaluated. Therefore, a total of nine panels with dimensions of 40 cm by 40 cm by 1.8 cm and with an average target density of 0.65 g/cm3 were manufactured under the laboratory conditions. Experimental panels were manufactured at two different percentage of zinc borate based on the oven dry wood weight (3% and 5%). Treatment zinc borate to wood strands was applied as a powder by mixing and the treatment was done before bindering. Modulus of elasticity, modulus of rupture, internal bond strength, thickness swelling, and water absorption of the samples were determined. The results were shown that use of zinc borate affected physical and mechanical properties of OSB panels, negatively. However, it was found that it positively affected decay resistance of the panels. Based on the findings in this study, it appears that three percent of zinc borate could be used to manufacture of oriented strandboard without having quite significant adverse influence on board properties

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