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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:
Jan. - Jun. 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
27 July 1995
Deviations:
no
Qualifier:
according to
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. certificate)
Type of method:
differential scanning calorimetry
Decomposition:
yes
Decomp. temp.:
> 174.72 °C

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.

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).

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.