Medium density fiberboard (MDF) is a wood-based panel that is composed of wood fibers bonded together with resin under heat and pressure. MDFs have a specific gravity ranging from 0.50 to 0.88 and have a wide application for both structural and non-structural uses (Rowell et al., 1995). In recent years, great changes have taken place in the MDF industry. Production of MDF products has increased dramatically and new plants are planned worldwide. MDF is used extensively in factory-assembled and ready-to-assemble furniture, as well as cabinets,underlayment, drawer fronts, molding, and counter tops. MDF is also replacing thin plywood and wet-process hardboard in the production of molded and flush door-skins (Krzysik et al., 1999).