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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:
2020-10-26 to 2020-11-03
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
27 July 1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
30 May 2008
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Atm. press.:
1 013 hPa
Remarks on result:
other: No melting point was found between -150 and +300°C under the conditions of the study. A glass transition was observed at -141°C.

The heat flow curves show a small glass transition at -141°C, indicating that the test item had solidified amorphously.

The thermograms from the measurements are attached

Conclusions:
During the melting point study, no melting point was determined between -150 and +300°C under the conditions of the present study, but a glass transition was observed at -141°C. The result is considered to be reliable.

Description of key information

Melting point: no melting point observed between -150 and +300°C under the conditions of the present study but a glass transition was observed at -141°C (OECD 102).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-141 °C

Additional information

Measurement of the melting point of the submission substance was attempted in a study conducted using a Differential Scanning Calorimetry (DSC) in accordance with OECD Test Guideline 102. No melting point was observed between -150 and +300°C under the conditions of the present study but a glass transition temperature was observed at -141°C. The result is considered to be reliable and is selected as key study.