Registration Dossier
Registration Dossier
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EC number: 269-093-5 | CAS number: 68187-40-6 This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 77364.
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:
- test procedure in accordance with national standard methods with acceptable restrictions
- Remarks:
- Only one measurement was made during the DTA.
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- other: DIN 51004 (2006) " Determination of melting temperatures of crystalline materials using differential thermal analysis"
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- thermal analysis
- Remarks:
- Differental Thermal analysis
- Key result
- Melting / freezing pt.:
- > 1 000 °C
- Conclusions:
- The sample shows three termal events from 25 to 1000°C. However, no thermal events related to pigment melting were recorded, which is consistent with the expectation of a melting point above 1400°C.
Reference
The sample shows three termal events from 25 to 1000°C:
(1) Exothermic thermal event located around 230°C (onset 215°C) which correspond with the combustion of a very minor proportion of organic matter.
(2) Exothermic thermal event located around 590°C (onset 390°C) which is supposed to correspond to Co2O3 oxidation to Co3O4.
(3) Endothermic thermal event located around 925°C (onset 908°C) which is supposed to correspond to Co3O4 reduction to CoO.
Description of key information
The melting point of the substance Olivine, cobalt silicate blue is > 1000 °C.Key value for chemical safety assessment
Additional information
The pigment displayed no thermal events from 25 to 1000 °C, which can be related to pigment melting.
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