The objective of this study was to determine some of the properties of experimental particleboard panels made from black locust (Robinia pseudoacacia L.). The furnish contained soundwood, partially decayed wood, branchwood, and bark that was mixed at different ratios and used to manufacture 30 panels. Modulus of elasticity (MOE), modulus of rupture (MOR), internal bond strength (113), and thickness swelling of the specimens were tested. It was found that the panels made from soundwood had the highest mechanical properties, while branchwood panels resulted in the lowest. The panels made from 100 percent branchwood had a significantly higher thickness swelling value (24.9%) than those of the other panel types. The samples made from various combinations of furnish did not result in significant differences in thickness swelling. The highest Stiasny number (phenol, or condensed tannin content) was found in the bark furnish, resulting in a slight reduction of thickness swelling. Based on the findings of this study, it appears that furnishes from different parts of black locust can be used to manufacture particleboard panels. Branchwood and bark content in the furnishes were found to be the main raw material parameters influencing properties of the experimental panels.