| abstract |
A surface modified alkali metal silicate having high moisture resistance and strength is provided. The following general formula (1): M 2 O.nSiO 2 .xH 2 O (1) (Wherein M represents an alkali metal, n is 0.5 ≦ n ≦ 5.0, and x is x ≦ 1.7). The surface of the alkali metal silicate represented by A surface-modified alkali metal silicate which is covered with a salt layer and has a surface SO 3 2− content of 0.1 mass ppm or more. [Selection figure] None |