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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:
November 04th, 2015
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
adopted July 27, 1995
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
GLP compliance:
no
Type of method:
differential scanning calorimetry
Decomposition:
yes
Decomp. temp.:
235 - 356 °C

First experiment: the first endothermic peak was observed between start temperature and 180 °C, probably caused by the water evaporation. The second endothermic peak was observed between 235 and 356 °C, caused by the thermal decomposition of the test substance. After the experiment the sample had lost 1.19 mg (44.07 %) of its mass and the residue had a black colour.

Second experiment: the endothermic peak was observed between start temperature and 180 °C, caused by the water evaporation. After the experiment the sample had lost 0.22 mg (7.36 %) of its mass and the aspect was not change.

Conclusions:
Melting temperature of the test substance could not be determined because of thermal degradation (at 235-356 °C) of the test substance.
Executive summary:

The melting temperature of the test substance was investigated. The Differential Scanning Calorimetry method was used. The procedures used in the study were in accordance with OECD Test Guideline No. 102. 

During the first experiment, a first endothermic peak was observed between start temperature and 180 °C, probably caused by the water evaporation. The second endothermic peak was observed between 235 and 356 °C, caused by the thermal decomposition of the test substance. After the experiment the sample had lost 1.19 mg (44.07 %) of its mass and the residue had a black colour.

The second experiment confirmed that the peak at 180 °C was caused by the water evaporation: after the experiment the sample had lost 0.22 mg (7.36 %) of its mass and the aspect was not change.

 

Conclusion

Melting temperature of the test substance could not be determined because of thermal degradation of the test substance.

Description of key information

Decomposition before melting (235-356 °C)

Key value for chemical safety assessment

Additional information

Differential Scanning Calorimetry - OECD 102