The preparation of overlaid medium density fiberboard (MDF) was studied. The flame retardant impregnated papers (FRIP) were overlaid on the surface of the MDF for the fire protection. The results showed that: 1) The production of the FRIP was based on the technology of melamine-impregnated paper, which required the viscosity of the impregnated resin lower than 20s. However, with the addition of the pentaerythritol (PER), one component of the flame retardant, the viscosity of the resin increased rapidly because of H-bonds. The viscosity of the resin was kept low by addition of urea. 2) The curing time of the resin was adjusted by the ratio of F/(M+U) and the addition of ammonium polyphosphate. 3) The surface bond strength of the FRIP met the standard requirements, which was influenced by the pressing conditions. 4) The flame retardant was concentrated on the surface of wood materials with the FRIP. The efficiency of the flame retardant was enhanced significantly, and better than that of the physical mixture and impregnation, and the cost was reduced.

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