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Physical & Chemical properties

Melting point / freezing point

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Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
11 December 2017 - 30 May 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
yes
Type of method:
capillary method
Remarks:
Metal block method; confirmation with Differential Scanning Calorimetry (DSC)
Key result
Decomposition:
yes
Decomp. temp.:
325 °C

During the preliminary melting block method observations, the test item was initially a white powder and then started to turn yellow in colour at 325°C. The test item then was observed to be brown in colour by 360°C. By the end of the test (400°C), the test item was observed to be brown in colour and partially melted. The test item was not a liquid and was considered to have decomposed before the melting point.

In order to confirm the preliminary observations, DSC was performed on a sample of the test item. The sample shows fluctuation of the baseline up to 210°C, indicative of loss of volatile components, and then a sharp peak starting at approximately 320°C, which indicates decomposition.

Conclusions:
The melting point of the test item could not be determined, as the test item decomposed before melting. The decomposition temperature was determined to be 325 °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, differential scanning calorimetry. The melting point of the test item could not be determined, as the test item decomposed before melting; the decomposition temperature was determined to be 325 °C.

The study is a GLP compliant, guideline experimental study and is fully acceptable for assessment of this endpoint.

Description of key information

The melting point of the test item could not be determined, as the test item decomposed before melting.

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, differential scanning calorimetry (Dunning 2018). The melting point of the test item could not be determined, as the test item decomposed before melting; the decomposition temperature was determined to be 325 °C.

The study is a GLP compliant, guideline experimental study and is fully acceptable for assessment of this endpoint.