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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:
24 November 2015 to 9 September 2016
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
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
<= -60 °C
Atm. press.:
ca. 98.9 kPa
Decomposition:
yes
Decomp. temp.:
ca. 153 °C

Melting Point

Two tests were performed on the test material using 6.87 and 7.70 mg (tests 1 and 2). Two very broad endotherms were recorded for both tests, the second one started soon after the first one finished ending exothermically. The onset of the first endotherm was 153 °C (mean of 147 and 159 °C, tests 1 and 2), the onset of the second endotherm was 304 °C (mean of 301 and 308 °C, tests 1 and 2) and the conclusion of the reaction was >400 °C. A black residue remained in the crucible after the tests. This would suggest onset of boiling with decomposition started at 153 °C. The melting temperature was considered to be <-60 °C, because it was a viscous liquid at room temperature and no thermal events were recorded from -60 °C until the onset of boiling at 153 °C.

Conclusions:
Under the conditions of the study, the melting temperature was considered to be <-60 °C, because it was a viscous liquid at room temperature and no thermal events were recorded from -60 °C until the onset of boiling at 153 °C.
Executive summary:

The melting point of the test material was investigated in accordance with the standardised guideline OECD 102 under GLP conditions.

The melting point of the test material was determined through differential scanning calorimetry. Aliquots of test material (6 to 8 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. No thermal events were recorded from -60 °C until the onset of boiling at 153 °C.

Under the conditions of the study, the melting temperature was considered to be <-60 °C, because it was a viscous liquid at room temperature and no thermal events were recorded from -60 °C until the onset of boiling at 153 °C.

Description of key information

Under the conditions of the study, the melting temperature was considered to be <-60 °C, because it was a viscous liquid at room temperature and no thermal events were recorded from -60 °C until the onset of boiling at 153 °C.

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 test material (6 to 8 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. No thermal events were recorded from -60 °C until the onset of boiling at 153 °C.

Under the conditions of the study, the melting temperature was considered to be <-60 °C, because it was a viscous liquid at room temperature and no thermal events were recorded from -60 °C until the onset of boiling at 153 °C.