| 摘要 |
PROBLEM TO BE SOLVED: To provide a method producing in high production efficiency and at a low cost an alumina based moisture regulating material capable of keeping an optional almost constant humidity and preventing dew condensation and propagation of fungi.tick even at a place where adsorption is increased rapidly at a controlled optional humidity and a low humidity is required locally (the place liable to dew such as corner). SOLUTION: In a first condition of a production method of the alumina based moisture regulating material, aluminum hydroxide powder is heat-treated under a reduced pressure atmosphere, preferably the reduced pressure atmosphere of <=0.9 atm. In a second condition, the aluminum hydroxide powder having <=50μm average grain size is heat-treated. In a more suitable third condition, the aluminum hydroxide powder having <=50μm average grain size is heat-treated under the reduced pressure atmosphere. In any condition, the heat treatment is preferably executed at 300-800 deg.C.
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