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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, 2017
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
Qualifier:
according to guideline
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.:
> 335 °C

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

A DSC measurement in an aluminium crucible with a hole showed an endothermal effect in the temperature range of 100 – 320 °C and a multistage exothermal effect in the temperature range of 335 – 475 °C. After the measurement the test item was a black solid. The mass loss after the DSC measurement amounted to 45 %. A second DSC measurement in an aluminium crucible with a hole was terminated at 320 °C. Again an endothermal effect in the temperature range of 120 – 310 °C was observed. After the measurement the test item was unchanged. No melting occurred. The mass loss after the DSC measurement amounted to 8 %. The result of the DSC measurement is 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

36679

10.49

25

500

100 – 320
(endothermal)

335 – 475
(exothermal)

Aluminium with a hole

Test item was a black solid after the measurement; not melted; mass loss: 45 %

36682

10.36

25

320

120 – 310
(endothermal)

 

Aluminium with a hole

Test item unchanged after the measurement; not melted; mass loss: 8 %

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. 335 °C.

Executive summary:

The test item had no melting point and no boiling point at atmospheric conditions. Decomposition started at approx. 335 °C.

Description of key information

The test item had no melting point and no boiling point at atmospheric conditions. Decomposition started at approx. 335 °C.

Key value for chemical safety assessment

Additional information