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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:
15 November 2017 - 22 December 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2016
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Version / remarks:
1998
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
-16.6 °C
Decomposition:
yes
Decomp. temp.:
75 °C

TGA EXPERIMENT (PRELIMINARY TEST)

Significant decrease of weight from 100°C. 25% weight loss at 118°C and 70% weight loss at 199°C.

After the experiment, a brown molten residu remained in the sample container (original colour: colourless). The change of the colour indicated reaction and/or decomposition of the test item

 

DSC EXPERIMENT 1

During cooling, an exothermic peak between -20°C and -40°C was found. The effect was obtained due to crystallization of the test item. During heating an endothermic peak was observed between -50°C and 0°C followed by an endothermic effect starting at 75°C. The extrapolated onset temperature of the first peak was -16.781°C. The endothermic effect was most likely obtained due to melting of the test item. Based on observations made during the preliminary test the second effect was due to reaction and/or decomposition of the test substance. After the experiment, the test item was unchanged in the sample container. DSC curve recorded during heating: see Illustration

DSC EXPERIMENT 2

Similar results as in Experiment 1 were obtained. The extrapolated onset of the melting peak was -16.338°C. After the experiment, the test item was unchanged in the sample container.

DATA HANDLING

The melting/freezing temperature was determined as themean extrapolated onset temperature of Experiment 1 (-16.781°C) and Experiment 2 (-16.338°C).

 

Conclusions:
The melting/freezing temperature of the substance was determined to be -16.6°C.

Executive summary:

Differential Scanning Calorimetry (DSC) experiments were performed in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200.

The melting/freezing temperature of the substance was determined in duplicate obtaining a mean value of -16.6°C.

During heating the reaction and/or decomposition of the substance started at 75°C.

Description of key information

The melting/freezing temperature of the substance was determined to be -16.6°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-16.6 °C

Additional information

The melting/freezing temperature of the substance was determined to be -16.6°C in a GLP study according to EC A.1, OECD 102 and OPPTS 830.7200.