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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:
2016-09-14 to 2016-12-08
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:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
May 2008
Deviations:
no
GLP compliance:
no
Type of method:
method to determine freezing temperature
Key result
Melting / freezing pt.:
< -35 °C
Atm. press.:
>= 985.8 - <= 989.4 mBar
Remarks on result:
other: No phase transition observed

The temperature in the crystallisation tube with the test item steadily followed the temperature of the bath in the main test.

No typical effect indicating a phase transition was observed. At the end of the measurement, the test item was liquid and only several small crystals in the liquid were observed.

Conclusions:
The freezing point of the test item is < -35°C at 989 to 986 mBar.
Executive summary:

The freezing temperature was assessed according to OECD 102, using a crystallization tube. The test item was cooled from 20°C to -40°C with a rate of 1°C/min. No phase transition was observed, the test item remained liquid and only several small crystals in the liquid were observed. It is hence concluded that the freezing temperature is < -35°C at 989 to 986 mBar.

Description of key information

For this endpoint two studies are available. A recent experimental study (2016) was performed according to OECD 102. The study showed that the freezing temperature of the test item is < -35°C at 986 to 989 mbar. According to the CRC Handbook (1993) the freezing temperature is -91°C. This result is used as supporting information.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-35 °C

Additional information