Registration Dossier
Registration Dossier
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EC number: 932-833-9 | CAS number: -
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
Melting Point: the substance undergoes thermal decomposition between 150 - 700°C (OECD 102)
Key value for chemical safety assessment
Additional information
The thermal behaviour of the sample as described in Section 1 of the IUCLID dataset was determined using DSC/TGA analysis in accordance with OECD 102. The substance was observed to undergo thermal decomposition between 150 - 700°C. A total weight loss of 50% was obtained at 300°C. Between 350 - 700°C, the sulfate present in the sample was loss, leading to the formation of ferric oxide at temperature above 800°C. The result is considered to be reliable and selected as key study. Similarly, the purer form of the substance also undergoes thermal decomposition from 150°C. Between 200 - 350°C, weight loss totaling about 65% was observed resulting in the formation of ferric oxide at temperature of around 400°C. In the DSC curve, the major exotherm obtained for the sample was observed to be much weaker than in the pure material which could be due to the presence of ammonium sulfate in the sample as registered. Also, the registered substance was reported to undergo decomposition via six weight-loss processes, three endothermic (110 - 230°C) and three exothermic (240 - 298°C) leading to the ultimate formation of iron (III) oxide. The substance has a melting point of about 230°C (Hussein 1994).
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