Registration Dossier

Physical & Chemical properties

Melting point / freezing point

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
September 20th to 22nd, 2017
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
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
adopted July 27, 1995
Qualifier:
according to guideline
Guideline:
other: OECD Guideline No. 113 (Screening Test for Thermal Stability and Stability in Air)
Version / remarks:
adopted May 12, 1981
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
The test item was used in its initial form.
Decomposition:
yes
Decomp. temp.:
128 °C

APPEARANCE OF TEST ITEM

Before the test, the substance appeared as a dark orange powder. After the experiments the test item melted and blackened in the crucible.

THERMAL BEHAVIOUR - FIRST EXPERIMENT

Summary of the DSC result in first experiment, referred to the graphic records

Experiment 1 Experiment 2 Experiment 3 Mean
Endotherm Peaks Left Limit [°C] 127.68 128.91 127.65 128.08
Right Limit [°C] 187.88 195.14 187.89 190.30
Exotherm Peak 1 Left Limit [°C] 187.86 - 187.90 187.88
Right Limit [°C] 195.55 - 205.56 200.56
Exotherm Peak 2 Left Limit [°C] 203.97 208.91 215.50 209.46
Right Limit [°C] 215.17 217.28 232.53 221.66

Values of the DSC run in the first experiment - Run 1

Sample weight [mg] Total loss of Mass (%) Onset of effect [°C] Endset of effect [°C] Left Limit [°C] Right Limit [°C] Energy [J/g]
4.39 64 172.3 187.31 127.68 187.88 -26.58 (endothermic)
187.86 195.55 187.86 195.55

2.57

(exothermic)

203.97 215.17 203.97 215.17

15.84

(exothermic)

Values of the DSC run in the first experiment - Run 2

Sample weight [mg] Total loss of Mass (%) Onset of effect [°C] Endset of effect [°C] Left Limit [°C] Right Limit [°C] Energy [J/g]
4.8 67.7 172.59 192.99 128.91 195.14 -36.11 (endothermic)
209.96 217.28 208.91 217.28

13.88

(exothermic)

Values of the DSC run in the first experiment - Run 3

Sample weight [mg] Total loss of Mass (%) Onset of effect [°C] Endset of effect [°C] Left Limit [°C] Right Limit [°C] Energy [J/g]
4.8 75.9 173.11 187.49 127.65 187.89 -22.63 (endothermic)
187.90 205.56 187.9 205.56

13.72

(exothermic)

227.34 232.19 215.5 232.53

20.77

(exothermic)

SECOND EXPERIMENT

During the heating up phase two consecutive endotherm peaks were observed in the temperature range of approx. 128-190 °C. During the cooling down phase no thermal effects were observed from 190 to 25 °C

Values of the DSC run in the second experiment - run 1

Sample weight [mg] Loss of Mass (%) Observation
3.09 2.3 reddish brown, clumped powder

Values of the DSC run in the second experiment - run 2

Sample weight [mg] Loss of Mass (%) Observation
4.30 4.9 reddish brown melt with shiny green surface; bubbles were visible in the melt.
Conclusions:
Substance decomposition at ca 128 °C
Executive summary:

For the determination of the melting point differential scanning calorimetry method was used. The test was carried out at normal atmospheric pressure.

Based on the results of the DSC curves and the appearance of the test item after the supplementary tests, the test item started to decompose from 128.08 °C (401.23 K).

Conclusion

Substance decomposition at ca 128 °C

Description of key information

Substance decomposition at ca 128 °C. No melting recorded up to 500 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
500 °C

Additional information

OECD 102 and 113 - differential scanning calorimetry

The value for the chemical safety assessment was set to the 500 °C, i.e. the higher limit of temperature investigated.