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Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
18 Jul - 13 Aug 2012
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
Type of method:
thermal analysis
Melting / freezing pt.:
> 121 °C
Decomp. temp.:
ca. 161 °C


The test item shows no melting of the main component up to 121 °C (in the 1. heating run) according to the definition in the OECD Guideline 102 (mean value from repeat determinations; 1st heating run. In the temperature range between 121 and 147 °C the test item shows an endothermic effect. This effect is possibly a change of the molecule structure (for example rearrangement / abreaction). The effect is probably not the melting of the test item (main component) which was verified by subsequent tests with the Kofler-heating bank and with the melting in a capillary.

119 °C - 146 °C (from first measurement)

122 °C - 149 °C (from second measurement)

122 °C - 148 °C (from third measurement)

Additional the sample shows a melting of crystalline sub components between 5 and 13 °C (1stheating run):

5 °C- 12 °C (from first measurement)

5 °C- 11 °C (from second measurement)

5 °C- 15 °C (from third measurement)

The cooling runs show no crystallisation of the main component. At -34 °C the test item shows possibly a glass transition temperature. From 161 °C the test item shows probably a thermal decomposition and evaporation of the decomposition components.

166 °C (from first measurement)

165 °C (from second measurement)

151 °C (from third measurement)

Description of key information

> 121 °C 

Key value for chemical safety assessment

Additional information

The melting point of the substance was determined by Differential Scanning Calorimetry according to OECD Guideline 102.

No melting of the main component up to 121 °C was observed. Melting of crystalline subcomponents occurred between 5 °C and 13 °C. The substance most probably decomposes at ca. 161 °C.