摘要：Self-heating or thermally explosible chemicals are divided into two large groups, the thermal decomposition or TD type and the autocatalytic decomposition or AC type. The TD type is further divided into liquids, for each of which the critical temperature for thermal explosion or T_c is calculated by applying the Semenov equation, and, solids, for each of which the Tc is calculated by applying the Frank--Kamenetskii or F--K equation. On the other hand, the AC type is further divided into solids of the quasi-AC type, in each of which the exothermic decomposition reaction occurs almost simultaneously with the endothermic melting, and, liquid or solid high explosives of the true AC type, in each of which the self accelerating exothermic decomposition reaction begins after an autocatalyst has appeared and accumulated. Neither of the two critical conditions for thermal explosion, i.e., the Semenov equation or the F--K equation, is applicable to the self heating behaviour of each individual chemical of the AC type for the calculation of the Tc. Instead, the respective self heating behaviour of them is in accord with the concept of the self accelerating decomposition temperature (SADT) in principle. The SADT of each individual solid of the quasi-AC type discussed in this paper as well as the critical temperature for self heating or Tc, of each individual high explosive of the true AC type is determined by the isothermal storage test. In this study, the respective SADTs of five solids of the quasi-AC type were determined using a simple and safe isothermal storage testing device.