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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:
May 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
May 31, 2008
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
July 27, 1995
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
March 1998
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
154.9 °C

Preliminary Test

Starting at 225°C, the weight of the sample decreased significantly. At 307°C, the sample weight had decreased by 25%.

After the experiment, a black molten residue remained in the sample container (original colour: white to brownish). The change of the colour indicated reaction and/or decomposition of the test item.

Main Study

An endothermic peak immediately followed by a small exothermic signal was observed between 150°C and 175°C. The extrapolated onset temperature of the peak was 154.945°C. The endothermic effect was most likely obtained due to melting of the test item. 

After the experiment, a brown/black molten residue remained in the sample container.

In order to investigate the melting peak, Experiment 2 was stopped after the melting peak at 175°C. The extrapolated onset temperature was 154.816°C. After the experiment, a yellowish molten residue remained in the sample container. It demonstrated that melting and reaction and/or decomposition of the test item was the reason for the endothermic effect. 

The melting temperature was determined as the mean melting temperature of Experiment 1 (154.945°C) and Experiment 2 (154.816°C).

Conclusions:
The melting and boiling temperature of CH02906 were determined by DSC.
The melting temperature of the test item was 154.9°C (428.0K).
Reaction and/or decomposition of the test item was observed during DSC experiments during and after melting of the test item. Boiling of the test item was not observed below the temperature at which reaction and/or decomposition started. Based on this, the test item has no boiling temperature.

Description of key information

Determined according to OECD 102 Guideline.

The melting and boiling temperature of CH02906 were determined by DSC.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
154.9 °C

Additional information