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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Henry's Law constant

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Description of key information

Henry's Law constant: 510000 Pa m³/mol at 20°C and 780000 Pa m³/mol at 25°C

Key value for chemical safety assessment

Henry's law constant (H) (in Pa m³/mol):
510 000
at the temperature of:
20 °C

Additional information

Henry's Law Constant values of 510000 Pa m³/mol at 20°C and 780000 Pa m³/mol at 25°C were determined in a reliable study conducted according to generally accepted scientific principles.

The Henry’s Law Constant (HLC) can also 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.

The calculated HLC value for HMDS at environmental temperature (12°C) is high, 450000 Pa m3 mol-1.