Registration Dossier
Registration Dossier
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EC number: - | 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:
- weight of evidence
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- > 400 °C
- Atm. press.:
- 1 013.25 hPa
- Remarks on result:
- other: No melting temperature was found between -50 °C and 400 °C.
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- weight of evidence
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- capillary method
- Key result
- Melting / freezing pt.:
- > 400 °C
- Atm. press.:
- 1 013 hPa
- Decomposition:
- yes
- Decomp. temp.:
- > 285 °C
- Remarks on result:
- other: At about 320 °C the test item was nearly black without any sign of melting up to 400 °C.
Referenceopen allclose all
Results in detail
Melting temperature
No melting temperature was found between -50 °C and 400 °C.
The estimated accuracy is ± 1 °C.
Observed thermal processes
In the 1st heating a flat broad endothermic area starting at about 25 °C showed the vaporization of volatiles (humidity). An additionally large endothermic peak between about 150 °C and 400 °C showed the vaporization of another volatile component.
In the 2nd heating thermic signals were no longer observed.
A visual assessment after the measurements didn't show any visual change of the test item and it was as powdery as before. This is a clear indication, that the test item did not melt during the measurement at the applied temperatures.
These observations are confirmed by the preliminary measurement using a melting point device.
The observed fluctuation at 250 °C and 300 °C were most probably caused by the evaporation of volatile components, corresponding to the large endothermic peaks in the DSC-measurement.
Results in detail
Melting temperature
No melting of the test item was observed between the start of the measurement at 30 °C and decomposition of the test item starting at about 285 °C.
The estimated accuracy is± 1 °C.
Observed thermal processes
A visual assessment of the measurement shows the beginning of visual change of the test item starting at about 285 °C. After that temperature the test item became darker. At about 320 °C the test item was nearly black without any sign of melting up to 400 °C.
This is a clear indication of decomposition of the test item during the measurement at the applied temperatures.
Description of key information
No meltig point up to 400 °C was observed.
Key value for chemical safety assessment
Additional information
Two GLP studies were conducted.
For form 1 a GLP study was conducted in accordance with the OECD Guideline for the Testing of Chemicals. 102 "Melting Point / Melting Range" using the Differential Scanning Calorimetry. No melting temperature was found between -50 °C and 400 °C.
For form 4 a GLP study was conducted in accordance with the OECD Guideline for the Testing of Chemicals. 102 "Melting Point / Melting Range" using the capillary tube. No melting of the test item was observed between the start of the measurement at 30 °C and decomposition of the test item starting at about 285 °C. At about 320 °C the test item was nearly black without any sign of melting up to 400 °C.
For all forms no melting point up to 400 °C was observed.
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