Based on the American National Standard for Particleboard (ANSI A208.1, 1998) and European Standard (EN 312-2, 1996), the minimum requirements for bending strength of particleboard panels for general uses are 11 MPa and 11.5 MPa, respectively. The bending strength of the UF-bonded particleboards containing 15% paper sludge satisfied the minimum required by ANSI A208.1 and EN 312-2 standards. All values obtained on bending strength of the panels bonded with 3% MDI were lower than those specified in the standards.