木質材料の防火性について

概要

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The combustibility of wood-based materials was examined by Inclined Panel Test method with a Bunsen burner (Fig. 1) and the effects of fire retardants on ignition time, duration of after flaming and after-glowing, charred surface area and charred length are observed. Furthermore, the moisture absorption of the fire retardant-tréated materials were tested at 20°C and 95% R. H.The wood-based materials used for this test are plywoods and three kinds of fiber boards. hard, semi-hard and insulation board. (Table 1)These test specimens were treated with several commercial fire retardants and were conditioned to keep constant moisture contents (5～7%) in the thermostat maintained at 40°C and 35.5% relative humidity which were given by vapour from MgCl2 saturated solution.The results obtained are summarized as follows : (1) the observed values of charred surface area and duration of after flaming are concerned rigidly with the characteristics of flame spread and seemed to give the significant estimate to fire resistance of wood-based materials, (2) the fire retardant-treated materials had a better fire resistance than the untreated ones, but the former absorbed more moisture.
日本火災学会の論文