| 摘要 |
To provide a novel water-addition type, chemical exothermic agent. An exothermic agent comprising, per mass thereof, more than 30% but not more than 40% of a calcium oxide powder having an average particle size of 75 mum to 150 mum, and not less than 60% but less than 70% of a mixed aluminum powder in which an aluminum powder having such a particle size distribution that a particle size of 45 mum pass is 70.0 to 80.0% and a particle size of 45 to 75 mum is 20.0 to 30.0% and an aluminum powder having such a particle size distribution that a particle size of 45 mum pass is 60 to 70%, a particle size of 45 mum is 20 to 30%, a particle size of 63 mum is 7 to 10% and a particle size of 75 mum is 1.0 to 2.0% are mixed at a mass ratio of 1:2. This exothermic agent may further contain 5 to 10%, relative to its total mass, of at least one inorganic salt compound selected from the group consisting of calcium sulfate, ferrous sulfate, magnesium chloride, sodium sulfite, sodium phosphate, and sodium carbonate.
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