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Description of key information

Key value for chemical safety assessment

Additional information

The transfer of a substance from the water phase to the gas phase can be estimated by means of the Henry’s Law Constant (HLC). No measured value for this parameter is available. The HLC can be estimated from the ratio of the vapour pressure to the water solubility.

Volatilisation from water is not relevant for triethoxysilane due to its rapid hydrolysis in contact with water.

The HLC cannot be calculated for the silanol hydrolysis product as there is no vapour pressure data andthe vapour pressure prediction is not applicable to inorganic silanols. The volatility of the hydrolysis product is expected to be very low based on its structure (small molecule silanols are predicted to have low vapour pressures) and its high water solubility.

The HLC for ethanol at environmental temperature (15°C) is low, 0.000252. Pa m3mol-1(SIDS, 2004).