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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:
October 20, 2017 - March 12, 2018
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
Melting / freezing pt.:
> 120 °C
Decomposition:
yes

Melting point / melting range: DSC measurement

Two DSC measurements with a heating rate of 10 K/min showed an endothermal effect in the temperature range of 80 – 145 °C. The onset temperature (see Table1) was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline. The first DSC measurement additionally showed a second endothermal effect in the temperature range of 165 – 225 °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 (melting) / °C

Crucible

Observations after the measurement

36641

13.67

25

500

85 – 145

165 – 225

-

Aluminium with a hole

Black residue

Mass loss: 60%

36649

9.48

25

156

80 – 150

-

Aluminium with a hole

Test item appeared partially melted

Mass loss:

 3%

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

 

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. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results. 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

70

10

160

Approx. 126 °C: test item started to melt

Approx. 132 °C: test item was a dark melt

Approx. 132 - 160 °C: no further changes (test item appeared fully melted)

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. 120°C. Afterwards decomposition started. It was concluded that the mass loss of the test item during the second DSC measurement was due to the water content of the test item corresponding to the first minimum of the endothermal effect.

Executive summary:

The test item Basic Blue 147 started to melt at approx. 120°C. Afterwards decomposition started.

Description of key information

The test item Basic Blue 147 started to melt at approx. 120°C. Afterwards decomposition started.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
120 °C

Additional information