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Physical & Chemical properties

Water solubility

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Description of key information

Water Solubility (trimethoxy(2-methylpropyl)silane): 4900 mg/l at 20°C (QSAR)
Water Solubility ((2-methylpropyl)silanetriol): very soluble at 20°C (QSAR)

Key value for chemical safety assessment

Additional information

The requirement to test the substance for water solubility is waived on the basis that it hydrolyses rapidly to (2-methylpropyl)silanetriol and methanol. The water solubility of both the registered substance (4900 mg/l) and the silanol hydrolysis product (1 000 000 mg/l) have been calculated using a validated QSAR.

The silanol is predicted to be very soluble in water; however, silanetriols may undergo condensation reactions to give siloxane dimers, oligomers and polymers; this will limit its solubility in practice.

Methanol is miscible in water at 20°C based on experimental data (OECD 2004).