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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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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Henry's law constant
Type of information:
experimental study
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Accepted calculation method using water solubility and vapour pressure as input data
no guideline required
Principles of method if other than guideline:
Calculated from water solubility and vapour pressure.
0.294 Pa m³/mol
25 °C

Description of key information

From the water surface the substance will not evaporate into the atmosphere. 

Key value for chemical safety assessment

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

Additional information

Henry’s law constant was calculated using the vapour pressure and the water solubility of 2-ethylhexanoic acid as input data. It is calculated to be 0.294 Pa*m³/mol (Hazardous Substances Database 2005)