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:
- key study
- Study period:
- Jan. - Jun. 2018
- 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:
- 27 July 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- dated 30. May 2008, published on 31. May 2008
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- differential scanning calorimetry
- Decomposition:
- yes
- Decomp. temp.:
- > 174.72 °C
- Conclusions:
- In all runs one endothermic rising was observed. According to the observations of the pretest the detected behavior can be interpret as decomposition of the test item, therefore no melting point could be determined because of decomposition of the test item.
- Executive summary:
The melting point of the sample was determined via DSC (differential scanning calorimetry) according to OECD guideline 102 and EU Method A.1 and under GLP conditions.
No melting point could be determined because of decomposition of the test item.
Beginning decomposition, evaluated with the event marker function, was determined under these circumstances as: 174.72 °C (447.87 K) (lowest value) The maximum was reached at: 220.84 °C (493.99 K) (highest value).
Reference
Pre-Test
The capillary tube containing the test item was set into the block at 18.6 °C. The block was heated until melting started. The temperature was noted at which the first signs of melting of the test item were observed. When the substance was completely melted, the temperature was noted again.
Security Pre-test for the DSC instrument
The crucible was bloated. The weight was recorded with 34.90 mg after reaching 420 °C. No further heating was performed. The crucible was opened and brown powdery residue was left. Decomposition is considered.
DSC Measurement of the Test Item
| Decomposition | in °C | |
| First Determination | Begin | 174.72 |
| Maximum | 213.55 | |
| Second Determination | Begin | 176.02 |
| Maximum | 220.84 | |
| Overall | Min | 174.72 |
| Max | 220.84 |
After measurement the crucible was opened and an orange-brown residue was left.
In both DSC runs one endothermic rising was observed. No event could be detected which could be identified as melting point. According to the observations of the pre-test the detected behavior can be interpret as decomposition of the test item.
Description of key information
The melting point of the sample was determined via DSC (differential scanning calorimetry) according to OECD guideline 102 and EU Method A.1 and under GLP conditions.
No melting point could be determined because of decomposition of the test item.
Beginning decomposition, evaluated with the event marker function, was determined under these circumstances as: 174.72 °C (447.87 K) (lowest value) The maximum was reached at: 220.84 °C (493.99 K) (highest value).
Key value for chemical safety assessment
Additional information
No melting point could be determined because of decomposition of the test item.
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