Registration Dossier
Registration Dossier
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EC number: 266-007-8 | CAS number: 65996-74-9 The oxidized surface of steel produced during reheating, conditioning, hot rolling, and hot forming operations. This substance is usually removed by process waters used for descaling, roll and material cooling, and other purposes. It is subsequently recovered by gravity separation techniques. Composed primarily of high-purity iron oxides. May contain varying amounts of other oxides, elements, and trace compounds.
Water solubility
Administrative data
Link to relevant study record(s)
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).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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