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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
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
thermal analysis
Decomposition:
yes
Decomp. temp.:
300 °C
Remarks on result:
other: There was no melting point between -100°C and 50°C. There was a glass transition at -26°C.

No melting temperature was found between -100°C and 50°C. A reproducible glass transition was found at -26°C in the first heating. No other thermic processes were found. In order to survey the thermic behaviour of the test item a TGA-test (non-GLP) was run up to 700°C. An endothermic peak starting at about 300°C with the weight loss of about 100% shows the vaporization/decomposition of the test item.

Determination

Glass Transition (°C)

A

-25.9

B

-25.9

Mean Value

-26.0

Conclusions:
The Differential Scanning Calorimetry (DSC) study found no melting temperature between -100°C and 50°C. A reproducible glass transition was found at -26°C.
Executive summary:

The melting point of the substance was determined in accordance with the OECD Guideline for Testing of Chemicals 102. The melting temperature was measured by Differential Scanning Calorimetry (DSC). No melting temperature was found between -100°C and 50°C. A reproducible glass transition was found at -26°C in the first heating. An endothermic peak starting at about 300°C with the weight loss of about 100% shows the vaporization/decomposition of the test item.

Description of key information

In the key study, no melting point was found between -100°C and 50°C. A glass transition was found at -26°C. The supporting study reported a melting point of -36.9°C. An endothermic peak starting at about 300°C with the weight loss of about 100% shows the vaporization/decomposition of the test item.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
300 °C

Additional information

Two studies were conducted to assess the melting point of the test substance. Both studies were considered reliable as they were conducted on the registered substance according to OECD Testing Guideline 102. No melting point was found between -100°C and 50°C. A glass transition was found at -26°C. An endothermic peak starting at about 300°C with the weight loss of about 100% shows the vaporization/decomposition of the test item. The supporting study reported a melting point of -36.9°C. There is no further information in the supporting study to determine whether this value refers to a true melting point, or to a glass transition. This information would be of help as the reported value is close to that of the glass transition reported in the key study.