Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
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EC number: 940-441-4 | CAS number: -
Melting point / freezing point
Administrative data
Link to relevant study record(s)
Description of key information
Not relevant, decomposition before melting under standard pressure from 262 °C on
Key value for chemical safety assessment
Additional information
- Frost RL, Wills RA, Kloprogge JT, Martens WN (2006). Thermal decomposition of hydronium jarosite (H3O)Fe3 (SO4)2 (OH)6. DOI 10.1007/s10973-005-6908-0 Print ISSN 1388-6150 Online ISSN 1572-8943 Journal of Thermal Analysis and Calorimetry 83(1):213-8. URL http://eprints.qut.edu.au/archive/00003718
Testing for this endpoint has been waived in accordance with Annex XI, 2, restrictions as testing is technically not feasible.
Frost et al. (2006) used thermogravimetry under ambient pressure combined with mass spectrometry to study the thermal decomposition of a synthetic hydronium jarosite. Changes in the molecular structure were followed by infrared emission spectroscopy. Mass spectrometry through evolved gases confirmed the mass loss steps, which were observed at 262, 294, 385, 557 and 619 °C.
It can thus firmly concluded from these observations that the submission item decomposes from 262 °C on before melting under standard pressure and melting is thus not a relevant process for the chemical safety assessment of the submission item.
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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