This study was carried out to determine the effects of various techniques for corner joints, prepared from plastic-based (Polystyrenelam=Pslam) material employed in furniture manufacturing on the diagonal compression and tensile performances. To that end, the corners prepared from plastic materials through various joint techniques (dowel type, polystyrene glued; dowel type, lathed, plain polystyrene glued) have been subjected to diagonal compression and tension tests. Consequently, the highest diagonal compression strength was found in the dowel type, polystyrene glued joint (820 N), while the lowest level was found in the Philipshead screwed 4x60 joint (196 N). As for the diagonal tension, the highest strength level has been found in the dowel type, polystyrene glued joint (1662 N), while the lowest level was found in the mini-fix joint (343 N). Accordingly, the dowel type, polystyrene glued corner joint technique may have advantageous in the plastic-based board used in furniture manufacturing compared to the other corner joint techniques.