Registration Dossier
Registration Dossier
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EC number: 263-606-6 | CAS number: 62570-50-7
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:
- comparable to guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- >= 236.7 °C
- Atm. press.:
- ca. 1 013.25 hPa
- Decomposition:
- yes
- Decomp. temp.:
- > 236.7 °C
- Conclusions:
- The melting temperature of Disperse Blue 359 was determined at 236.7 (509.9K) by using DSC.
Reaction and/or decomposition of Disperse Blue 359 was observed during DSC experiments during and after melting. Boiling of the test item was not observed below the temperature at which the reaction and/or decomposition started. Based on this, the test item has no boiling point. - Executive summary:
The melting temperature of Disperse Blue 359 was determined at 236.7 (509.9K) by using DSC.
Reaction and/or decomposition of Disperse Blue 359 was observed during DSC experiments during and after melting. Boiling of the test item was not observed below the temperature at which the reaction and/or decomposition started. Based on this, the test item has no boiling point.
Reference
The TGA-curve of the test item showed a significant decrease of the sample from 275 ˚C onwards, at 549 ˚C the sample weight had decreased by 24%. After the experiment, a black molten residue remained in the sample container (c.f. original colour dark blue). The change of the colour indicated reaction and/or decomposition of the test item.
The DSC-curve obtained in experiment 1 shows a small exothermic peak between 150 ˚C and 175 ˚C. The reason for this effect was most likely due to an artefact. An endothermic peak between 200 ˚C and 250 ˚C was observed, the extrapolated onset temperature of the peak was 237.680 ˚C. The effect was most likely obtained due to melting of the test item. An exothermic peak between 275 ˚C and 400 ˚C was observed, most likely due to reaction and/or decomposition of the test item. After the experiment a black molten residue remained in the sample container.
To investigate reaction and/or decomposition a lower heating rate of 5 ˚C/minute was applied in experiment 2. An endothermic peak followed by an exothermic peak between 200 ˚C and 275 ˚C was observed. The extrapolated onset temperature of the endothermic peak was 234.043 ˚C. The effect was most likely obtained due to melting of the test item. After the experiment, a black molten residue remained in the sample container.
To investigate the melting peak experiment 3 was stopped directly after the melting peak for the visual observation of the residue. The extrapolated onset temperature of the melting peak was 238.506 ˚C. After the experiment, a dark purple molten residue remained in the sample container. It demonstrated that melting and/or decomposition of the test item was the reason for the endothermic effect.
The melting temperature was determined as the average melting temperature obtained from experiment 1 (237.680 ˚C), experiment 2 (234.043 ˚C), experiment 3 (238.506 ˚C).
Description of key information
The melting temperature of Disperse Blue 359 was determined at 236.7 (509.9K) by using DSC.
Reaction and/or decomposition of Disperse Blue 359 was observed during DSC experiments during and after melting. Boiling of the test item was not observed below the temperature at which the reaction and/or decomposition started. Based on this, the test item has no boiling point.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 236.7 °C
Additional information
The melting temperature of Disperse Blue 359 was determined at 236.7 (509.9K) by using DSC.
Reaction and/or decomposition of Disperse Blue 359 was observed during DSC experiments during and after melting. Boiling of the test item was not observed below the temperature at which the reaction and/or decomposition started. Based on this, the test item has no boiling point.
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