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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Physical & Chemical properties

Water solubility

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Administrative data

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Description of key information

Hydrogen peroxide is miscible in water in all proportions.

Key value for chemical safety assessment

Additional information

No test on the water solubility of hydrogen peroxide is available. A number of handbooks on technical chemistry (Goor et al. 1989, Kirchner 1979) give statements based on expert knowledge that hydrogen peroxide is miscible in water in all proportions. This standpoint is also accepted in the EU Risk Assessment Report for hydrogen peroxide (European Commission 2003) and is supported by the experience from many years of handling the substance. There is thus weight of evidence that hydrogen peroxide is miscible in water in all proportions. No further testing is required.