Registration Dossier
Registration Dossier
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EC number: 257-098-5 | CAS number: 51274-00-1 This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 77492.
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: Data from peer-reviewed handbook or collection of data
- Principles of method if other than guideline:
- no data
- GLP compliance:
- not specified
- Type of method:
- other: no data
- Melting / freezing pt.:
- > 160 °C
- Atm. press.:
- ca. 1 013 hPa
- Remarks on result:
- other: Modification: water will be released
- Melting / freezing pt.:
- ca. 260 - ca. 320 °C
- Remarks on result:
- other: Transformation to Fe2O3
- Melting / freezing pt.:
- 1 565 °C
- Remarks on result:
- other: mp of diiron trioxide
- Conclusions:
- At 260-320°C transformation to Fe2O3.
melting point of Fe2O3 > 1000°C
Reference
Typical differential thermograms of Fe Oxides have been attached. The first endotherm at 100 -200°C is due to the release of adsorbed water, the amount depends on the particle size and pre-treatment. For the FeOOH forms it is followed by a second endotherm due to dehydroxylation. For goethites (alpha-form) the temperature of this second endotherm increases with increasing crystal size and crystal order. For example, as the synthesis temperature increased from 4 to 80°C, goethite crystallinity improved and the endothermic peak temperature shifted from 260 to 320°C.
The following melting point is listed in the handbook of Lide for diiron trioxide:
Diiron trioxide 1565 °C
Description of key information
At 260-320°C transformation to Fe2O3.
melting point of Fe2O3 > 1000°C
Key value for chemical safety assessment
Additional information
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