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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:
13 September 2012 to 12 December 2012
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
GLP compliance:
yes (incl. certificate)
Type of method:
method to determine freezing temperature
Key result
Melting / freezing pt.:
< -20 °C
Remarks on result:
other: The test material did not freeze
Melting / freezing pt.:
< 253 K
Remarks on result:
other: The test material did not freeze

Temperature data were recorded every 30 seconds for 1650 seconds (determination 1) and 1680 seconds (determination 2). The test material did not freeze.

Conclusions:
Under the conditions of this study the freezing temperature of the test material was determined to be less than -20 °C (253 K).
Executive summary:

The melting/freezing point of the test material was investigated in accordance with the standardised guidelines EU Method A.1 and OECD 102 under GLP conditions.

An aliquot (approximately 15 mL) of test material was placed into a test tube containing a thermometer and wire loop with which the sample could be agitated. The test tube was surrounded by a glass jacket and then placed into a large beaker containing an acetone/dry ice mixture. The temperature and observations of the test material were recorded every 30 seconds.

The acetone/dry ice bath was maintained until the temperature had reached -21 °C or until the test material solidified. Testing was carried out in duplicate under a nitrogen atmosphere.

Under the conditions of this study the freezing temperature of the test material was determined to be less than -20 °C (253 K).

Description of key information

The freezing temperature of the test material was determined to be less than -20 °C (253 K).

Key value for chemical safety assessment

Additional information

The melting/freezing point of the test material was investigated in accordance with the standardised guidelines EU Method A.1 and 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).

An aliquot (approximately 15 mL) of test material was placed into a test tube containing a thermometer and wire loop with which the sample could be agitated. The test tube was surrounded by a glass jacket and then placed into a large beaker containing an acetone/dry ice mixture. The temperature and observations of the test material were recorded every 30 seconds.

The acetone/dry ice bath was maintained until the temperature had reached -21 °C or until the test material solidified. Testing was carried out in duplicate under a nitrogen atmosphere.

Under the conditions of this study the freezing temperature of the test material was determined to be less than -20 °C (253 K).