Relative flammability and relative toxicity data are presented for 30 samples of thermal insulation materials. A com promise between flammability and toxicity appears to be neither inherent nor necessary in selection of materials. Cellulosic and synthetic materials appear to represent significantly different combinations of flammability and toxicity hazards, and therefore require different approaches when planning and designing applica tions. Polyurethane rigid foam seemed to be significantly less toxic and slightly less flammable than wood under these particu lar test conditions.
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