Registration Dossier
Registration Dossier
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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: 233-072-9 | CAS number: 10028-22-5
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Handbook of reliable peer-reviewed data
- Principles of method if other than guideline:
- No details are available on the guideline used to determine this result.
- GLP compliance:
- not specified
- Type of method:
- other: Unknown
- Decomposition:
- yes
- Decomp. temp.:
- 480 °C
- Sublimation:
- no
- Remarks on result:
- other: The atmospheric pressure at which this result was determined is not stated.
- Conclusions:
- A decomposition temperature of 480°C is reported in a handbook of reliable data which has been subject to peer-review and in which the original data sources are traceable. The result is considered to be reliable.
Reference
Description of key information
Anhydrous form decomposes without melting at 480 ºC; Nonahydrate decomposes without melting at 400 ºC; Aqueous solution (40 %) -20 to -30 ºC
Key value for chemical safety assessment
Additional information
“Sublimation”
It should be noted that all the soluble iron salt category members decompose at elevated temperatures to give toxic gases. This is sometimes noticed as “sublimation”.
Ferric sulphate, Fe2(SO4)3
The anhydrous salt is solid to high temperatures, with a decomposition temperature of 480 ºC. The hydrated forms decompose at lower temperatures and the aqueous solution melts below 0 ºC.
Table: Melting points of the registered category member salt forms under standard pressure (ISO 5011, i.e. 101.3 kPa)
| Category member, Molecular Formula | Anhydrous form | Solid hydrate form | Aqueous solution |
| Ferric sulphate, Fe2(SO4)3 | 480 °C (decomposes) | Nonahydrate CAS 13520-56-4: 175 °C (loss of water), 400 °C (decomposition) | -20 to -30 °C |
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