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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:
April 06, 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.:
> 280 °C

Two DSC measurements in aluminium crucibles with a hole showed endothermal effects in the temperature range of 35 – 45 °C and 115 – 150 °C with no clear melting point (onset). Above 280 °C an exothermal decomposition followed. Visual inspection of the crucible of the experiment which was stopped before the decomposition showed an unchanged test item. Thus no melting was observed.

The results of the DSC measurements are summarized in Table 1.

Table1: Melting point (DSC measurements)

Ident No.

Test item /

mg

Starting temperature /

°C

Final test temperature /

°C

Temperature range (endo-thermal) /

°C

Onset (melting) / °C

Crucible

Observations after the measurement

36932

11.25

25

500

115 – 145

-

Aluminium with a hole

Test item was a black residue: 50 % mass loss

36933

9.90

25

180

35 – 45

115 – 150

-

Aluminium with a hole

Test item was unchanged: 5 % mass loss

Executive summary:

The test item had no melting point and no boiling point at atmospheric conditions. Decomposition started at approx. 280 °C.

Description of key information

The test item had no melting point and no boiling point at atmospheric conditions. Decomposition started at approx. 280 °C.

Key value for chemical safety assessment

Additional information