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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:
November 13, 2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Decomposition:
yes
Decomp. temp.:
ca. 100 °C
Remarks on result:
other: The test item had no melting point and no boiling point at atmospheric conditions.

The DSC measurement in an aluminium crucible with a hole showed an exothermal effect starting at 120 °C. After the measurement the test item was discoloured to black. Under consideration of the result from the DSC measurement it was concluded that the test item had no melting point and no boiling point at atmospheric conditions. Decomposition started at approx. 100 °C.

Conclusions:
The test item had no melting point and no boiling point at atmospheric conditions. Decomposition
started at approx. 100 °C.
Executive summary:

The melting point / melting range and boiling point / boiling range are determined by differential scanning calorimetry. The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded. The DSC measurement in an aluminium crucible with a hole showed an exothermal effect starting at 120 °C. After the measurement the test item was discoloured to black. Under consideration of the result from the DSC measurement it was concluded that the test item had no melting point and no boiling point at atmospheric conditions. Decomposition started at approx. 100 °C.

Description of key information

Under consideration of the result from the DSC measurement it was concluded that the test item had no melting point at atmospheric conditions. Decomposition started at approx. 100 °C.

Key value for chemical safety assessment

Additional information