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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:
February 02nd, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Qualifier:
according to
Guideline:
other: OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
The test item was used its initial form.
Decomposition:
yes
Decomp. temp.:
170 - 255 °C

During the heating two consecutive exothermic signals were observed in the temperature range of approx. 172 – 254 °C that can be associated with the decomposition of the test item.

Summary of the DSC Test of test item

Experiment 1 Experiment 2 Mean

Onset of the first exothermic effect [°C]

209.67

210.24 209.96
Endset of the first exothermic effect [°C] 228.71 229.41 229.06
Left Limit of the exothermic effects [°C] 173.79 170.41 172.10
Right Limit of the exothermic effects [°C] 252.52 255.42 253.97
Energy [J/g] -403.12 -387.21 -395.16

Values of the DSC run in the first experiment

Sample weight [mg] Total loss of Mass of the Sample (%) Onset of the first exothermic effect [°C] Endset of the first exothermic effect [°C] Left Limit [°C] Right Limit [°C] Energy [J/g]
4.11 39.7 209.67 228.71 173.79 252.52 -403.12 (exothermic)

Values of the DSC run in the second experiment

Sample weight [mg] Total loss of Mass of the Sample (%) Onset of the first exothermic effect [°C] Endset of the first exothermic effect [°C] Left Limit [°C] Right Limit [°C] Energy [J/g]
3.06 43.8 210.24 229.41 170.41 255.42 -387.21 (exothermic)

APPEARANCE OF THE SAMPLE

Before the test, the appearance of the sample was dark violet powder. After the experiments the test item blackened and its volume increased in the crucible.

Conclusions:
The substance decomposes before melting (at ca 210 °C)
Executive summary:

The thermal behaviour of test item was assessed using the DSC analysis, according to the OECD guideline 102 and OECD guideline 113.

The test was carried out at normal atmospheric pressure. The endotherm and exotherm peaks in the thermograms do not imply phase transition from a solid to liquid state. Using a linear heating rate melting point was not observed from room temperature up to 500 °C.

During the heating two consecutive exothermic signals were observed in the temperature range of approx. 172 – 254 °C (onset 210 °C) that can be associated with the decomposition of the test item.

Before the test, the appearance of the sample was dark violet powder. After the experiments the test item blackened and its volume increased in the crucible.

Conclusion

The substance decomposes before melting (at ca 210 °C)

Description of key information

The substance decomposes before melting (at ca 210 °C)

Key value for chemical safety assessment

Additional information

OECD 102/113 - differential scanning calorimetry