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EC number: 255-037-7 | CAS number: 40690-89-9
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
- Study period:
- September 22, 2016
- 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:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- 150.8 °C
- Decomposition:
- yes
- Decomp. temp.:
- 280 °C
- Executive summary:
The test item Disperse Orange 73 started to melt at 150.8 °C. Afterwards decomposition followed.
Reference
Melting point / melting range: DSC measurement
A DSC measurement in aluminium crucibles with a hole showed a multistage endothermal effect in the temperature range of 105 – 165 °C. Afterwards exothermal decomposition started. Approx. 42 % mass was lost. A 2nd measurement was performed, which was stopped before the exothermal. This measurement showed a multistage endothermal effect in the temperature range of 106 – 162 °C. No mass was lost. Visual inspection of the crucible showed a melt. Thus the endothermal was attributed to melting of the test item.
The results of the DSC measurements are summarized in Table 1.
Table1: Melting point (DSC measurements)
Ident No. |
Test item / mg |
Starting temperature / °C |
Final test temperature / °C |
Temperature range (melting) / °C |
Onset / °C |
Crucible |
Observations after the measurement |
35504 |
9.94 |
25 |
400 |
105 –165 |
Multi-stage, 151.01 |
Aluminium with a hole |
Test item was black after the measurement; mass loss 4.18 mg. |
35505 |
10.82 |
25 |
200 |
105– 165 |
Multi-stage, 150.51 |
Aluminium with a hole |
Test item was a dark melt after the measurement |
The test item had a melting point of 150.8 °C (broad multi-stage endothermal effect) followed by decomposition.
Description of key information
The test item Disperse Orange 73 started to melt at 150.8 °C. Afterwards decomposition followed.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 150.8 °C
Additional information
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