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Physical & Chemical properties

Melting point / freezing point

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Description of key information

Under the conditions of the study the melting temperature of the test material was < -60 °C. A consistent exotherm was observed to start at 352 °C indicative of decomposition.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-60 °C

Additional information

The melting point of the test material was investigated in accordance with the standardised guideline OECD 102 under GLP conditions. The study was assigned a reliability score of 1 in accordance with the criteria for assessing data quality set forth by Klimisch et al. (1997).

The melting point of the test material was determined through differential scanning calorimetry.Aliquots of the test material (7.23, 6.26 and 6.23 mg) were weighed into 40 µL aluminium crucibles and a lid with a 50 µm diameter orifice cold welded on to them. Each crucible was subjected to the same heating regime, with an air flow of 50 mL/min. The test material is a liquid at room temperature, so the test was started at -60 °C, isothermal for 15 minutes, then heating at 5 °C/min to 20 °C and then 10 °C/min to 400 °C. There was no endotherm corresponding to a melting temperature, therefore the melting temperature of the test material was < -60 °C. Between about 200 °C and about 350 °C small exothermic shifts or small exothermic artefacts were observed, indicating instability, but not quantifiable. A consistent exotherm was observed to start at 352 °C (mean of 356, 349 and 350 °C tests 1-3 respectively) indicative of decomposition. During testing there was an oily burning odour noted suggesting decomposition was occurring. After testing the test crucibles were coated with black residue on the outside and there was a black oily residue inside the crucibles.

Under the conditions of the study the melting temperature of the test material was < -60 °C. A consistent exotherm was observed to start at 352 °C indicative of decomposition.