Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Environmental fate & pathways

Henry's Law constant

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

86.8 Pa m3/mol at 23 °C (Nielsen)

Key value for chemical safety assessment

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

Additional information

A fairly broad range of values have been reported for the Henry's Law constant (Handbook of Physical-Chemical Properties and Environmental Fate for Organic Chemicals, Vol. III, Oxygen Containing Compounds, 2nd Ed., 2006, CRC Press, p2267; NIST Chemistry Webbook). The value by Nielsen (1994) is taken as one of the few experimentally determined values.

The Guidance on Information Requirements and Chemical Safety Assessment Chapter R.7a: Endpoint Specific Guidance, Appendix R.7.1 -4 indicates that substances with a Henry's Law constant of around 100 Pa m3/mol will volatilise from water rapidly.