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Physical & Chemical properties

Water solubility

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Description of key information

Mill scale has a water solubility of ca. 1 µg/L.

Key value for chemical safety assessment

Water solubility:
1 µg/L
at the temperature of:
20 °C

Additional information

Mill scale is a UVCB substance. Mill scale is mainly and primarily composed of iron oxides (see composition section 1.2) and essentially insoluble. As a surrogate for the water solubility of mill scale, a study on diiron trioxide (Currenta, 2009) is included in the dossier. At a loading of 10 g/L, after 24 hours, the concentration of dissolved iron in the supernatant was < 1 µg/L.


This is supported by further studies on other iron oxide forms (see study records marked as supporting studies).