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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:
From 2018-12-24 to 2019-03-22
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
Study performed to current OECD guidelines with no significant deviations and run in OECD GLP certified lab.
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Purity: 99.7%
Batch No.: 80031745a
Key result
Melting / freezing pt.:
124.6 °C
Atm. press.:
1 atm
Decomposition:
no

 Preliminary Test

Starting at 250°C, the weight of the sample decreased significantly. At 320°C, the sample weight had decreased by 25%.

After the experiment, a black molten residue remained in the sample container (original colour:off-whitebased on visual observation of a technician). The change of the colour indicated reaction and/or decomposition of the test item.

1.1.2.                 Main Study

An endothermic effect was observed between 100°C and 150°C followed by an endothermic effect starting at 250°C. The extrapolated onset temperature of the first effect was 124.513°C. The endothermic effect was most likely obtained due to melting of the test item. The second endothermic effect was probably obtained due to reaction and/or decomposition of the test item.

After the experiment, a dark brown molten residue remained in the sample container (original colour: off white based on visual observation of a technician). The change of the colour indicated reaction and/or decomposition of the test item. 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 124.609°C. After the experiment, a white molten residue remained in the sample container (original colour: off white based on visual observation of a technician). It demonstrated that melting was the reason for the endothermic effect.

The melting temperature was determined as the mean melting temperature of Experiment 1 (124.513°C) and Experiment 2 (124.609°C).

Conclusions:
The melting temperature of the test item was 124.6°C (397.7K).
Executive summary:

The melting temperature of the test item were determined by DSC.

The melting temperature of the test item was 124.6°C (397.7K).

Description of key information

The melting temperature of the test item was 124.6 °C (397.7K).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
124.6 °C

Additional information

The melting temperature of the test item were determined by DSC.

The melting temperature of the test item was 124.6°C (397.7K).