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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:
May 08, 2018 - May 14, 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
Melting / freezing pt.:
153.9 °C
Decomposition:
yes
Decomp. temp.:
> 180 °C

Melting point / melting range: DSC measurement

DSC measurements with a heating rate of 10 K/min showed an endothermal effect (melting) in the temperature range of 125 – 170 °C. Above 180 °C exothermal decomposition followed. The onset temperature (seeTable1) was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline. Visual inspection of the crucibles after the experiment, which were stopped before the exothermal decomposition, showed a melt.

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

36999

11.46

25

500

125 – 170

153.7

Aluminium with a hole

Test item was a black solid: 90 % mass loss

37001

12.83

25

180

130 – 165

154.2

Aluminium with a hole

Test item was a green melt: no mass loss

38009

12.75

25

184

130 – 165

153.9

Aluminium with a hole

Test item was a dark melt: no mass loss

The test item had a mean melting point of 153.9 °C.

Executive summary:

The test item had a mean melting point of 153.9 °C. Above 180 °C exothermal decomposition occurred.

Description of key information

The test item had a mean melting point of 153.9 °C. Above 180 °C exothermal decomposition occurred.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
153.9 °C

Additional information