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The Building Research Institute is developing an apparatus for toxicity testing of building materials. The toxicity of combustion products of typical materials are evaluated by animal exposure tests using the new apparatus. The weights of the materials when generating combustion products sufficient to cause incapacitation of mice under given exposure conditions (steady - state) are obtained and combined with the time to incapacitation. It is shown that the relative degrees of toxicities of combustion products of materials may be expressed by those values (ECT).