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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.
In an acute
oral toxicity study, male Wistar rats were given a single oral dose
of alpha-Fe2O3 in water at a dose of 10000 mg/kg bw (limit test); the
treatment was followed by 14 days of observation. No control animals
were used in this study. No mortality and clinical abnormalities were
observed. The study yielded an oral LD50 of > 10000 mg/kg bw for male
rats. Ferric oxide is practically non toxic based on the results of this
study, and classification and labelling for acute oral toxicity is not
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