Antibacterial and antifungal effects of fired scallop shell - glass composites have been examined. The composites were fabricated by the following simple process: (1) mixing the powder mixture of fired shell, raw shell and glass with aqueous NaOH solution, (2) first drying, (3) steam treatment, and (4) second drying. In this study, the powder mixtures with the shell (fired shell + raw shell) : glass weight ratios of 1 : 1 have been employed as raw materials. It has been found that the composites are successfully hardened when the fired shell contents in the original powder mixture is less than 35 mass%. Antibacterial and antifungal effects of the composites were tested for Escherichia coli and Cladosporium sp.. It has been found that the composites with relatively high content of fired shell (≥ 20 mass% for Escherichia coli and ≥ 25 mass% for Cladosporium sp.) show significant antibacterial and antifungal effects.

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