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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 27th, 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
adopted July 27, 1995
Deviations:
no
Qualifier:
according to
Guideline:
other: OECD Guideline 113 (Screening Test for Thermal Stability and Stability in Air)
Version / remarks:
adopted May 12, 1981
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.:
176 - 223 °C

Before the test the appearance of test item was brown powder; after the experiments the test item was blackened in the crucible and its volume decreased.

During the heating the test item showed exothermic signals from approx. 176 °C, which was assumed to the decomposition of the test item.

Replicate Sample weight [mg] Total loss of Mass of the Sample (%) Left Limit [°C] Mean Left Limit [°C] Right Limit [°C] Mean Right Limit [°C] Onset [°C] Mean onset [°C] Energy [J/g] Mean Energy [J/g]
Experiment 1 5.26 56.7 176.07 176.14 220.43 223.99 193.05 205.54 -68.32 (exothermic) -56.37
Experiment 2 4.36 56.0 176.21 227.55 218.03 -44.41 (exothermic)
Conclusions:
The substance decomposes before melting/boiling at ca 176 °C; the mean decomposition energy is ca. 56.37 J/g.
Executive summary:

The thermal behaviour of the substance was investigated using Differential Scanning Calorimetry method, according to OECD guidelines 102 and 113. A small amount of test item was placed in aluminum crucible; the furnace was heated from 25 to 500 °C with 10 °C /minutes heating rate. The measurement was performed under nitrogen atmosphere. Before and after the test, the weight and the appearance of the sample were determined. The experiment was performed in duplicate.

Before the test the appearance of test item was brown powder; after the experiments the test item was blackened in the crucible and its volume decreased. During the heating the test item showed exothermic signals from approx. 176 °C, which was assumed to the decomposition of the test item.

Conclusion

The substance decomposes before melting/boiling at ca 176 °C.

Description of key information

The substance decomposes before melting/boiling at ca 176 °C, the mean decomposition energy is ca. 56.37 J/g.

Key value for chemical safety assessment

Additional information

OECD 102 and 113 - differential scanning calorimetry