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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 13, 2018 to May 02, 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.:
ca. 200 °C
Decomposition:
yes
Decomp. temp.:
> 200 °C

 

Melting point / melting range: DSC measurement

Two DSC measurements with a heating rate of 10 K/min showed a multistage endothermal effect in the temperature range of 200 – 290 °C. 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 / °C

Crucible

Observations after the measurement

36863

19.77

25

500

200 – 290

multi-stage

Aluminium with a hole

Black residue

Mass loss: 56%

36867

13.07

25

300

200 – 265

multi-stage

Aluminium with a hole

Black residue

Mass loss: 36%

An additional measurement with the capillary method was performed in order to clarify the melting range.

1.1.2.Melting point / melting range: capillary tube in a metal block

A measurement with the capillary method was performed to clarify the results of the DSC measurements. The filling height of the test item was approximately 5 mm.

The results are summarized in Table 2.

Table2: Results of the capillary method

No.




Set point /
°C

Heating rate / K/min

End
point /
°C

Remarks

1

180

10

330

Approx. 205 °C: Test item started to melt

Approx. 221 °C: Test item was fully melted

Approx. 227 °C: The melt moved upwards in the capillary

Approx. 241  C: Gas formation

Approx. 280 - 292 °C: Liquid solidified as a black residue

Approx. 292 – 330 °C: No further change

2

200

1

221

Approx. 202 °C: Test item started to melt

Approx. 212 °C: Test item was a full black melt.

Approx. 220  C: Bubble formation

Approx. 221 °C: No further change

Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item started to melt at approx. 200 °C. Directly afterwards decomposition started.

Executive summary:

The test item started to melt at approx. 200 °C followed by direct decomposition.

Description of key information

The test item started to melt at approx. 200 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
200 °C

Additional information