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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:
2011-03-21 to 2011-03-22
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Remarks:
The study was conducted according to an appropriate test method. It was not compliant with GLP.
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
GLP compliance:
no
Other quality assurance:
other: ISO 9001:2008
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
-49.4 °C
Atm. press.:
101.3 kPa

During measurement, an exothermic process was shown beginning at ~-95°C (~178K) with an onset temperature of ~-90°C (183K). This was interpreted as a form of crystalization process which resulted to the formation of a solid phase. The solid phase melts with an endothermic reaction at -49.4°C (223.8K) onset temperature.

The melting temperature can only be detected if the cooling process is carried out to a temperature below the crystalization temperature (-95°C). The table of results are shown below:

Table 1: Results

Test

Melting temperature

1

-49.4°C

2

-49.4°C

Mean value

-49.4°C (223.8K)

Approximate accuracy of the instrument = ±0.5K (up to 600K)

Conclusions:
A melting temperature of -49.4°C at 1013 hPa has been determined for the test substance using an appropriate test method. The result is considered reliable.

Description of key information

Melting point/freezing point: -49.4°C at 1013 hPa (OECD 102)

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-49.4 °C

Additional information

A measured melting temperature of -49.4°C at 1013 hPa was determined for the registered substance using a differential scanning calorimetry method in accordance with OECD Test Guideline 102 and in compliance with a known quality system (ISO 9001:2008). The result is considered to be reliable.