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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:
29 November 1993
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
1992
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
ca. 288 °C
Decomposition:
yes
Remarks on result:
other: Reaction/decomposition starts during melting.

First experiment:

An endothermic effect started at 265°C. This effect was probably caused by melting of the substance. The extrapolated onset of the melting peak was 287°C. The maximum of the effect was at 309°C. Above this temperature, the effect changed to exothermic which indicates reaction or decomposition of the substance. After the experiment the sample appeared to have been molten; the colour was dark brown. Mass loss of the sample 66%.

 

Second experiment:

The DSC-curve shows an endothermic effect which starts at 275°C. The extrapolated onset of the melting peak was 288°C. After the experiment the sample had a brown beige colour. Mass loss of the sample: 40%.

 

Conclusions:
The melting temperature was determined to be ca. 288°C. Reaction/decomposition starts during melting.

Executive summary:

Differential Scanning Calorimetry (DSC) experiments were performed in a GLP study according to EC A.1. The melting temperature was determined to be ca. 288°C. Reaction/decomposition starts during melting.

Description of key information

Melting point: ca. 288°C (EC A.1: DSC). Reaction/decomposition starts during melting.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
288 °C

Additional information

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