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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 2021-02-05
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.: 472782
Purity: 99.8%
Melting / freezing pt.:
253.2 °C
Atm. press.:
1 013.25 hPa
Decomposition:
yes
Decomp. temp.:
> 250 °C

- Preliminary Test:


Starting at 275℃, the weight of the sample decreased significantly. At 352℃, the sample weight had decreased by 25%.


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


- Main Study:


Experiment 1: An endothermic effect was observed directly followed by two exothermic effects starting at 250℃. The extrapolated onset temperature of the endothermic effect was 253.109℃. The endothermic effect was most likely obtained due to melting of the test item. The exothermic effects were due to reaction and/or decomposition of the test item.


After the experiment, a black molten residue remained in the sample container (original colour: white to off-white to slightly 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 253.257℃. After the experiment, a red/brown molten residue remained in the sample container (original colour: white to off-white to slightly yellow). It demonstrated that melting and reaction and/or decomposition were the reasons for the endothermic effect.


The melting temperature was determined as the mean melting temperature of Experiment 1 (253.109℃) and Experiment 2 (253.257℃).

Conclusions:
The melting temperature of the test item was 253.2℃ (526.3K)
Executive summary:

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


The melting temperature of the test item was 253.2℃ (526.3K).

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 253.2℃ (526.3K).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
253.2 °C

Additional information