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Environmental fate & pathways

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Based on the chemical nature of synthetic amorphous calcium silicate (inorganic structure and chemical stability of the substance), no photo- or chemical degradation is expected.

The water solubility is limited, for the calcium silicate tested (see 4.8) about 4 % under test conditions.

As shown for silica, hydrolysis to a minor, not yet quantifiable degree is limited to a gel-layer surrounding the silica/silicate particle in aqueous medium. Hydrolysis of silica has been shown to be largely independent of the pH between 1.1 and 8.9, contributing to the limited dissolution of silica in water. Therefore, similar to silica, hydrolysis is assumed to play no substantial role in the dissolution process of calcium silicate.