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EC number: 605-104-5 | CAS number: 157577-99-6
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:
- November 24,2011-November 25,2011
- Reliability:
- 1 (reliable without restriction)
- Qualifier:
- according to guideline
- Guideline:
- other: AKP 549
- GLP compliance:
- no
- Type of method:
- thermal analysis
- Melting / freezing pt.:
- > 190 °C
- Decomposition:
- yes
- Remarks:
- Thermal decomposition of the test substance in connection with the lost of mass started at the temperature 190°C.
- Decomp. temp.:
- > 190 °C
- Conclusions:
- No endothermic peak corresponding to melting of the test substance was recorded in the tested temperature range from 25° to 600°C. Thermal decomposition of the test substance in connection with the lost of the mass started at the temperature 190°C.
- Executive summary:
The substance was tested for melting/freezing point by DCS thermal analysis in the range of 25° to 600°C. No endothermic peak corresponding to melting of the test substance was recorded. Thermal decomposition of the test substance connection with the lost of the mass started at the temperature 190°C.
Reference
Results:
Figure 1 shows the DSC-curve that was recorded during the first experiment. The endothermic peak was observed between start temperature and 190°C, the exothermic peak was observed between 190°C and 360°C. The endothermic peak was probably caused by water evaporation, the exothermic by decomposition of the test substance. After the experiment the sample non-appeared to be molten, hadlost 0.54 mg (35.8%) of its mass and the residue had a black colour.
The water contain determined by Karl Fisher method is 9.21%. Considering the water content the endothermic peak (DSC analysis) and first loss of weight (TGA analysis) are caused by water evaporation.
Description of key information
decomposition > 190°C
Key value for chemical safety assessment
Additional information
One study (2011, VUOS) on Acid Black 234 was performed by means of DSC, that showed only the inset of a thermal decomposition at 190°C. No peak corresponding to melting point was observed.
Acid Black 234 does not melt, but it decomposes, with decomposition onset > 190°C.
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