Resin content had no significant effect on the shear strengths of the particleboards, whereas higher MDI resin content resulted in higher values of bending strength.
Dimensional stability of the MDI-bonded boards improved as paper sludge content increased. Water absorption and thickness swelling values of the produced boards were relatively high. However, all three-layer boards bonded with 12% UF satisfied the water absorption and thickness swelling for general uses according to ASTM D 1037-99 standard. Overall, UF-bonded particleboards gave superior mechanical performance, water resistance, and thickness swell than MDI-bonded particleboards.