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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Diss Factsheets

Environmental fate & pathways

Henry's Law constant

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Administrative data

Link to relevant study record(s)

Description of key information

Key value for chemical safety assessment

Additional information

Hydrogen peroxide is fully miscible with water. The low value for the Henry’s Law Constant of hydrogen peroxide of 7.5 x 10-4 Pa x m3 x mol-1 (Hwang and Dasgupta 1985) indicates that the substance has a low ability to volatilise from water. Indeed, hydrogen peroxide tends to evaporate to a much lesser extent from a mixture of water and hydrogen peroxide than the water (European Commission 2003).