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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:
March 21, 2017
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.:
> 170 °C

Three DSC measurements with a heating rate of 10 K/min in aluminium crucibles with a hole showed a multistage endothermal effect in the temperature range of 120 – 240 °C with no clear melting point (onset). The 1st endothermal effect in the temperature range occurred in the temperature range 130 – 150 °C. The 2nd endothermal effect in the temperature range 170 – 210 °C was attributed to decomposition. The test item showed no melting.

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 (melting) /

°C

Onset /

°C

Crucible

Observations after the measurement

36168

10.09

25

500

120 –240

Multi-stage

Aluminium with a hole

Test item was a black solid after the measure-ment: 62 % mass loss

36170

9.99

25

150

130 – 150

Multi-stage

Aluminium with a hole

Test item was a red solid after the measure-ment: 4 % mass loss

36172

8.72

25

250

130 - 210

Multi-stage

Aluminium with a hole

Test item was a black solid after the measure-ment: 26 % mass loss

The test item showed no melting up to 170 °C. The test item decomposed.

Executive summary:

The test item showed no melting up to 170 °C. The test item decomposed.

Description of key information

The test item showed no melting up to 170 °C. The test item decomposed.

Key value for chemical safety assessment

Additional information