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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:
2014
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Guideline study performed under GLP. All relevant validity criteria were met.
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Remarks:
inspected: March 2013; signature: May 2013
Type of method:
thermal analysis
Melting / freezing pt.:
ca. -51 °C
Atm. press.:
1 atm
Decomposition:
no
Sublimation:
no
Remarks on result:
other: mean result of two DSC determinations

Main study

- Experiment 1: The DSC-curve obtained examined the melting point of the substance. During cooling, an exothermic peak between -50°C and -75°C was observed. The effect was due to crystallisation of the test substance. When heated, an endothermic peak between -50°C and -0°C was observed. The extrapolated onset temperature was -50.59°C. The effect is due to melting of the test substance. An endothermic effect was observed between 225°C and 275°C. This effect was most likely obtained due to evaporation of the test substance. After the experiment it was observed that the test substance was evapourated from the sample container.

 - Experiment 2 was performed to determine the duplicate melting point of the substance. Similar results to experiment 1 were obtained .The extrapolated onset of the melting peak was -51.50°C.

The melting temperature was determined as the average melting temperature obtained from experiment 1 (-50.59°C) and experiment 2 (-51.50°C).

Conclusions:
The freezing temperature of the substance has been determined to be less than 222 ± 0.5 K or < -51.0 ± 0.5 °C.
Executive summary:

The melting/freezing temperature was determined using EU Method A.1 and Differential Scanning Calorimetry under GLP. The mean freezing temperature of the test substance has been determined to be 222 K or < -51.0 °C at 1 atmosphere pressure.

Description of key information

Mp: 222 K (-51.0 °C) at 1 atmosphere, EU Method A.1 - Thermal Analysis Method, 2014

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-51 °C

Additional information

Key study: EU Method A.1, 2014 : The melting/freezing temperature was determined using EU Method A.1 and Differential Scanning Calorimetry under GLP. The mean freezing temperature of the test substance has been determined to be 222 K or < -51.0 °C at 1 atmosphere pressure.