Registration Dossier
Registration Dossier
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EC number: 228-067-3 | CAS number: 6107-56-8
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:
- 02 May 2018 to 25 May 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)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- capillary method
- Remarks:
- Metal block method; confirmation with Differential Scanning Calorimetry (DSC)
- Key result
- Decomp. temp.:
- 162 °C
- Remarks on result:
- other: The test item decomposed before melting. The onset of decomposition was 162°C.
- Conclusions:
- The test item decomposed before melting. The onset of decomposition was 162°C.
- Executive summary:
The melting point of the test item was determined in a study following OECD 102 and EC Method A.1 guidelines, using the capillary, metal block method, and for confirmation the differential scanning calorimetry method. The test item decomposed before melting.
The study is a GLP compliant, guideline experimental study and is fully acceptable for assessment of this endpoint.
Reference
During the preliminary melting block method observations, the test item was initially a white powder and then started to discolour at approximately 168°C. The test item was then observed to have become dark brown in colour by 218°C. The test item was not a liquid and was therefore considered to have decomposed before the melting point.
During the additional preliminary test, the test item was observed to discolour from white to dark brown over the temperature range 162 to 218°C.
In order to confirm the preliminary observations, DSC was performed on a sample of the test item. The trace presents the heat flow of the sample which shows a small endotherm at approximately 160°C and a sharp endotherm at approximately 225°C. These were indicative of decomposition.
As the DSC profile supports the heating block observation for the onset of decomposition, the decomposition was considered to start at 162°C.
Description of key information
The test item decomposed before melting. The onset of decomposition was 162°C.
Key value for chemical safety assessment
Additional information
The melting point of the test item was determined in a study following OECD 102 and EC Method A.1 guidelines, using the capillary, metal block method and for confirmation the differential scanning calorimetry method. The test item decomposed before melting.
The study is a GLP compliant, guideline experimental study and is fully acceptable for assessment of this endpoint.
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