A New Method for Making Particleboard Fire-Retardant

A simple and effective method for making particleboard fire-retardant is reported. This process involves the hot- pressing of fire-retardant chemicals into the particleboard through surface impregnation with suitable temperature, pressure and pressing time. Ammonium dihydrogen orthophosphate and liquid ammonium polyphosphate were used as the fire retardants, and optimum conditions for impregnating these fire retardants were determined. The surface flammability of the particleboard was substantially reduced by this method with relatively less fire retardant than that required by the conventional in-process treatment. The surface qualities of treated board were comparable to those of the untreated one. This process can be readily employed by any existing particleboard plant.

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