Recently corrugated cardboard is utilized for not only packing materials but also furniture and beds at shelters in Japan. The cardboard has widely used due to the characteristics of lightness, high strength, cheapness and recycle ability. Therefore, there is the strong need to add flame retardancy for cardboard beds in medical facilities for prevention of second disaster. The purpose on this study is to add flame retardancy to the cardboards with keeping the recycle ability. In this paper, the cardboard of combusting behavior was measured by using a calorimeter under the UL-94 standard. So far we have used 6 kinds of flame retardant include 3 kinds of commercial flame retardant. As a result ammonium sulfate has given superior flame retardancy to cardboards. However we considered that it has no practical use, because flame retardancy of cardboards must be safety from chemical toxicity. Therefore we selected 2 kinds of flame retardant. As a result a flame retardant which contains phosphorus and nitrogen gave great flame retardancy to cardboards with small quantity.
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