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EC number: 426-840-1 | CAS number: -
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:
- February 24, 1997 - March 05, 1997
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- adopted July 27, 1995
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- EEC Publication No. L383, December 1992
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- > 400 °C
- Remarks on result:
- not determinable
- Conclusions:
- SCARLET RN 1165 does not melt under the conditions of the test, meaning that melting point is >400°C.
- Executive summary:
The melting point of SCARLET RN 1165 has been determined in the current study performed following OECD TG 102 according to GLP. The selected method is Differential Scanning Calorimeter (DSC).
In the preliminary test, the quantities of heat absorbed or released off were measured and recorded at heating rate of 20 K/min from 40°C to 400°C.
Before and after the test, the weight and the appearance of the sample were determined.
An endothermic heat effect was observed between 127 .3 °C and 182.4 °C. Between about 300 °C and 370 °C an exothermic heat effect occurs. After the experiment, the sample had lost about 19.9 % of its mass and the colour of the sample was changed to black. The sample still was a powder and obviously had not been melted and solidified again. The test article does not boil under ambient conditions in the temperature range investigated.
In order to determine the endothermic reaction more precisely, further DSC-runs were recorded between about 145 °C and 200 °C with a heating rate of 1 K/min. In the second run, the endothermic reaction was determined to be between 159. 7 °C and 162.6°C. This is not due to melting of the sample because it was shown to be a non-reversible process. This peak does not appear during the second heating of the same test vessel. The endothermic effect might be caused by a change in crystalline structure, but further evaluation is beyond of the scope of this study. Details were not given in the report. During these runs, the sample lost 5.7 % of its mass. After the measurement the sample was still a powder and coloured red.
In conclusion, SCARLET RN 1165 does not melt under the conditions of the test, meaning that melting point is >400°C.
Reference
In the preliminary test, the quantities of heat absorbed or released off were measured and recorded at heating rate of 20 K/min from 40°C to 400°C.
Before and after the test, the weight and the appearance of the sample were determined.
An endothermic heat effect was observed between 127 .3 °C and 182.4 °C. Between about 300 °C and 370 °C an exothermic heat effect occurs. After the experiment, the sample had lost about 19.9 % of its mass and the colour of the sample was changed to black. The sample still was a powder and obviously had not been melted and solidified again. The test article does not boil under ambient conditions in the temperature range investigated.
In order to determine the endothermic reaction more precisely, further DSC-runs were recorded between about 145 °C and 200 °C with a heating rate of 1 K/min. In the second run, the endothermic reaction was determined to be between 159. 7 °C and 162.6°C. This is not due to melting of the sample because it was shown to be a non-reversible process. This peak does not appear during the second heating of the same test vessel. The endothermic effect might be caused by a change in crystalline structure, but further evaluation is beyond of the scope of this study. Details were not given in the report. During these runs, the sample lost 5.7 % of its mass. After the measurement the sample was still a powder and coloured red.
In conclusion, SCARLET RN 1165 does not melt under the conditions of the test, meaning that melting point is >400°C.
Description of key information
SCARLET RN 1165 does not melt under the conditions of the test performed according to the EEC Directive 92/69, A.1 "Melting/Freezing temperature", December 1992 and to the OECD Guideline No. 102: " Melting point I melting range", adopted July 27, 1995
Key value for chemical safety assessment
Additional information
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