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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

Iron powder is insoluble at 22°C. Metallic iron  rapidly oxidizes to form Fe(II), then Fe(II) slowly oxidizes to Fe(III) which finally precipitates in Fe(OH)3 (rust red iron oxide)

Key value for chemical safety assessment

Water solubility:
0.015 mg/L
at the temperature of:
22 °C

Additional information

Iron will not dissolve in water or dilute aqueous solutions of electrolytes, it is oxidized by (aerated) water but forms mainly insoluble oxides.

A seven day transformation/dissolution test according to the OECD guidilen 29 and the GHS (Annex 10) protocol was run on iron powder at a mass loading of 100 mg/l and a pH of 6.0. Under the conditions of this test, the dissolution of Fe is 19.4 µg/L for the 7 -day endpoint.

Chemical equilibrium modelling (ETAP, 2010) was carried out to calculate a solubility limit for iron using iron (III). Solubility limits of 0.015, 0.0024 and 0.00001 mg/L were calculated at pH 6, 7, and 8, respectively.