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EC number: 235-552-3 | CAS number: 12284-76-3
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:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- other: Differential scanning calorimetry and metal block (capillary) method
- Melting / freezing pt.:
- > 450 °C
- Atm. press.:
- 101.3 kPa
- Decomposition:
- ambiguous
- Sublimation:
- no
- Conclusions:
- The melting point of the test substance was deemed to be greater than the highest temperature utilised on study (450°C).
Reference
The test substance was heated to a maximum of 450 °C in the DSC analysis and 300 °C using a metal block analysis method. No changes indicating that the substance melted were observed (i.e. the melting point is considered to be > 450 °C).
In the metal block analysis, the substance underwent a transient color change from 190 °C (turning yellow/brown from off white), with evidence of drying observed at 206 °C. No presence of the yellow/brown color change was noted from 225 °C up to 300 °C. The cause of the color change and the wide thermal events noted in the DSC thermograms could not be conclusively explained, although these likely relate to changes in non-labile water content present in the test item’s crystal structure. Other possibilities such as decomposition, surface oxidation and rearrangement of the crystal structure itself could not be ruled out.
Description of key information
The melting point of the substance was considered using both DSC and capillary techniques. The test substance was heated to a maximum of 450°C in the DSC analysis and 300°C using a metal block analysis method. No changes indicating that the substance melted were observed (i.e. the melting point is considered to be > 450°C). As such, no relevant value is available as the key value for chemical safety assessment.
Key value for chemical safety assessment
Additional information
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