Abstract
Japanese modern houses become highly airtight and thermally insulated, because of saving energy. As a result, problems related to humidity of indoor air have been increased, for example, excessive dew formation etc. To solve these problems, we have developed a new humidity controlling material. It was found that allophane,sepiolite and diatomite have good performance for raw material of humidity controlling material by measuring adsorption isotherm for moisture. By evaluating humidity controlling characteristics of samples made from these raw materials, it was cleared that humidity controlling characteristics is influenced by pore size distribution. Especially, the equilibrium of moisture adsorption is influenced by micro pore less than 10 nm, and the speed of moisture adsorption is influenced by macro pore.
