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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 April 2019 - 08 May 2019
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 (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
294.4 °C
Decomposition:
yes
Decomp. temp.:
325 °C

TGA EXPERIMENT (PRELIMINARY TEST)

Decrease of weight from 350°C upwards: 25% at 371°C and 70% at 395°C.

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

 

DSC EXPERIMENT 1

 An endothermic effect was observed between 250°C and 275°C followed by an endothermic effect between 275°C and 300°C and an endothermic effect starting at 325°C. The reason for the first endothermic peak was unknown. The extrapolated onset temperature of the second effect was 294.520°C. The second endothermic effect was most likely obtained due to melting of the test item. The third endothermic effect was due to reaction and/or decomposition of the test item. After the experiment, a brown molten residue remained in the sample container.

DSC EXPERIMENT 2

In order to investigate melting of the test item, Experiment 2 was stopped directly after the first endothermic effect. After the experiment, the sample appeared to have been unchanged, i.e. no melting and/or decomposition were observed.

DSC EXPERIMENT 3

In order to investigate melting of the test item, Experiment 3 was stopped directly after the second endothermic effect. The extrapolated onset temperature of the second endothermic effect was 294.310°C. After the experiment, a white molten residue remained in the sample container. It demonstrated that melting was the reason for the second endothermic effect.

DSC curve: see Illustration below.

RESULT

Melting temperature: mean extrapolated onset temperature of Experiment 1 (294.520°C) and Experiment 3 (294.310°C).

 

Conclusions:
The melting temperature of the substance was determined to be 294.4°C.
Executive summary:

Differential Scanning Calorimetry was performed. The experiments were based on EC A.1, OECD 102 and OPPTS 830.7200 (melting temperature) and on EC A.2, OECD TG 103 and OPPTS 830.722 (boiling temperature). The DSC curve showed an endothermic effect due to melting. The melting temperature of the substance was determined in duplicate obtaining a mean value of 294.4°C. Boiling of the substance was not observed below the temperature at which reaction and/or decomposition started (i.e. at 325°C).

Description of key information

Melting point: 294.4°C (EC A.1, OECD 102, OPPTS 830.7200: DSC)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
294.4 °C

Additional information

Reaction and/or decomposition at > 325°C