To characterize humidity conditioning ceramics, the relative humidity as a function of temperature (
H(
T)) was measured using a glass desiccator technique with varying the ambient temperature between 298 and 288K. A logarithmic plot of
H(
T) was approximately represented by a linear function, and the humidity conditioning ability was evaluated by the slope (
B) of such a linear equation (
B-value method). Humidity conditioning ceramics, made of several ceramic materials such as Wakkanai diatomaceous shale, calcium silicate and zeolite, were characterized according to their
B-values in comparison with wood. The relation between the
B-value and the ratio of the exposed surface area of the material to the volume of desiccator was also investigated to extend the efficiency of the
B-value method to the large scale of actual applications. It was also found that the
B-value method to estimate the humidity conditioning ability for wooden material can be applied to porous ceramics, which had
B-values higher than wood. The porous diatomaceous ceramics showed the highest
B-value among the ceramic investigates.
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