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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:
06 Nov 2017 - 25 Mar 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Melting / freezing pt.:
129.8 °C
Atm. press.:
1 013 hPa
Remarks on result:
other: Atm. pressure taken as 1013 hPa

Preliminary Test

Starting at 150 °C, the weight of the sample decreased significantly.  At 268 °C, the sample weight had decreased by 25%. After the experiment, a black molten residue remained in the sample container (original colour: off-white). The change of the colour indicated reaction and/or decomposition of the test item.

Main Study

An endothermic peak was observed between 100 °C and 150 °C. The extrapolated onset temperature of the peak was 129.863 °C. The endothermic effect was most likely obtained due to melting of the test item. An endothermic peak was observed starting at 225 °C. The endothermic effect was due to reaction and/or decomposition of the test item.

After the experiment, a brown/black molten residue remained in the sample container.

In order to investigate the melting peak, Experiment 2 was stopped directly after the melting peak. The extrapolated onset temperature was 129.649 °C. After the experiment, a colourless molten residue remained in the sample container. It demonstrated that melting was the reason for the endothermic effect. The melting temperature was determined as the mean melting temperature of Experiment 1 (129.863 °C) and Experiment 2 (129.649 °C).

Conclusion

The melting temperature of the test item was 129.8 °C (402.9K).

Description of key information

Melting point is 129.8 ºC (OECD 102, DSC method).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
129.8 °C

Additional information