In this study, influence of melamine formaldehyde addition into the urea formaldehyde adhesive on some physical (thickness swelling) and nıechanical (static bending, modulus of elasticity and internal bond) properties of particleboard was investigated. Melamine formaldehyde addition did not affect the nıechanical properties, statistically. However, this application improved the thickness swelling of particleboard. The particleboards produced with 30% melamine formaldehyde and 70% urea formaldehyde usage had the required levels of physical and nıechanical properties by the standards. This study showed that melamine formaldehyde addition into the urea formaldehyde should not exceed 30%.