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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
Study period:
June 11, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Decomposition:
yes
Decomp. temp.:
> 220 °C

Melting point / melting range // boiling point / boiling range: Differential scanning calorimetry

The first DSC measurement in an aluminium crucible with a hole showed a endothermal effect in the temperature range of 120 – 220 °C, directly followed by a multistage exothermal effect. A second measurement was stopped after the endothermal effect and before the exothermal effects. Visual inspection showed no melting. The test item seemed to be unchanged.

The results of the DSC measurements are summarized in Table1.

Table1: DSC measurements

Ident No.

Test item /

mg

Starting temperature /

°C

Final test temperature /

°C

Temperature range /

°C

Crucible

Observations after the measurement

38031

23.87

25

500

120–220
(endothermal)

>220
(exothermal)

Aluminium with a hole

Test item was a black solid after the measurement; mass loss: 29 %

38032

16.74

25

240

120 – 155
(endothermal)

Aluminium with a hole

Test item was unchanged after the measurement; mass loss: 9 %

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. 220 °C.

Executive summary:

The test item had no melting point and no boiling point at atmospheric conditions. Decomposition started at approx. 220 °C.

Description of key information

The test item had no melting point and no boiling point at atmospheric conditions. Decomposition started at approx. 220 °C.

Key value for chemical safety assessment

Additional information