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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 (VP) to the water solubility (WS).

HLC = (VP x MW)/WS

Where MW is molecular weight.

Volatilisation from water is not relevant for the parent substance due to its very rapid hydrolysis in contact with water to trimethylsilanol and ammonia.

The calculated HLC value for trimethylsilanol at environmental temperature (12°C) is low, 3.7 Pa m3mol-1 (taken from EUSES 2.1.2). The calculated HLC value for ammonia at environmental temperature (12°C) is moderate, 17 Pa m3mol-1(taken from EUSES 2.1.2).