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Key value for chemical safety assessment

Additional information

No measured data are available for hexachlorodisilane.

Hexachlorodisilane contains no chromophores that would absorb visible or UV radiation, so direct photolysis is not likely to be significant. Hexachlorodisilane hydrolyses very rapidly to hexahydroxydisilane and HCl. Therefore, reaction with water vapour, rather than photolysis, is expected to be the primary degradation process in air. The Si-Si bonds may also react to produce monosilicic acid. At concentrations above about 100-150 mg/l (measured as SiO2 equivalents), condensation products of monosilicic acid ((poly)silicic acid) and hexahydroxydisilane can form.

These hydrolysis products are inorganic substances which enter natural biogeochemical cycles.