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Henry's Law constant

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Description of key information

Henry's Law Constant:

Calculated HLC for tert-butyldimethylsilanol at environmental temperature (25°C): 12 Pa m3mol-1


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.


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


For the silanol hydrolysis products, tert-butyldimethylsilanol, the predicted water solubility limit cannot be validated accurately due to condensation phenomena.The HLC can be estimated using the established Bond method from HENRYWIN v. 3.20 within the EPIWeb suite v4.11. This method derives the Henry's Law Constant directly from the structure,as the sum of the bond contribution values for each chemical bond in the molecule. The bond contribution values were determined based on least-square regression analysis of measured HLCs for organic compounds.


The calculated HLC value for the silanol hydrolysis product at environmental temperature (25°C) is 12 Pa m3mol-1.