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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:
From 2020-12-21 to 2021-01-07
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
July 27, 1995
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Batch No.: 451021
Purity: 99.1%
Melting / freezing pt.:
118.8 °C
Atm. press.:
1 013.25 hPa
Decomposition:
yes
Decomp. temp.:
> 250 °C

- Preliminary Test:


Starting at 225°C, the weight of the sample decreased significantly. At 327°C, the sample weight had decreased by 25%.


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


- Main Study:


Experiment 1: An endothermic effect was observed between 100°C and 150°C followed by an exothermic effect between 250°C and 300°C. The extrapolated onset temperature of the endothermic effect was 119.029°C. Based on weight loss observed during the preliminary test, the endothermic effect was most likely obtained due to melting of the test item and evaporation of volatile components (solvent, impurities, e.g.). The exothermic effect was due to reaction and/or decomposition of the test item.


After the experiment, a red/brown molten residue remained in the sample container (original colour: yellow). Based on this visual observation, it was found that the test item had molten and the change of the colour demonstrated reaction and/or decomposition of the test item.


In order to investigate the endothermic effect, Experiment 2 was stopped directly after the melting effect. The extrapolated onset temperature was 118.552°C. After the experiment, a yellow molten residue remained in the sample container (original colour: yellow). It demonstrated that melting was the reason for the endothermic effect.


The melting temperature was determined as the mean melting temperature of Experiment 1 (119.029°C) and Experiment 2 (118.552°C).

Conclusions:
The melting temperature of the test item was 118.8°C (391.9K).
Executive summary:

The melting temperature of test item was determined by DSC based on OECD 102.


The melting temperature of the test item was 118.8°C (391.9K).

Description of key information

The melting temperature of test item was determined by DSC based on OECD 102.


The melting temperature of the test item was 118.8°C (391.9K).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
118.8 °C

Additional information