Registration Dossier
Registration Dossier
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EC number: 269-412-8 | CAS number: 68238-92-6
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- Endpoint:
- melting point/freezing point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- February 22, 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
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- adopted July 27, 1995
- Deviations:
- no
- Qualifier:
- according to guideline
- 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. QA statement)
- Type of method:
- differential scanning calorimetry
- Decomposition:
- yes
- Decomp. temp.:
- 268 - 424 °C
- Conclusions:
- The substance decomposes before melt (between ca 268 - 424 °C).
- Executive summary:
The thermal behaviour of the substance was investigated using differential scanning calorimetry method, according to the OECD guidelines 102 and 113.
A small amount of test item was placed into aluminum crucible and sealed with closed aluminum lid using a capsule presser. Thus, prepared capsule was inserted into the furnace of the DSC device and 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 red powder; after the experiments the test item became black powder in the crucible.
During the heating the test item showed endothermic signal in the temperature range of approx. 95 - 160 °C that can be associated with the water evaporation of the test item. Between 271 - 424 °C a consecutive continuous exothermic peak could be observed, which was assumed to the decomposition of the test item.
Conclusion
The substance decomposes before melt (between ca 268 - 424 °C).
Reference
Before the test the appearance of test item was red powder; after the experiments the test item became black powder in the crucible.
During the heating the test item showed endothermic signal in the temperature range of approx. 95 - 160 °C that can be associated with the water evaporation of the test item. Between 271 - 424 °C a consecutive continuous exothermic peak could be observed, which was assumed to the decomposition of the test item.
| Sample weight [mg] | Total loss of Mass (%) | Left Limit [°C] | Right Limit [°C] | Energy [J/g] | |
| Experiment 1 | 3.53 | 37.4 | 267.63 | 423.70 | -161.87 (exothermic) |
| Experiment 2 | 3.04 | 40.1 | 274.57 | 423.55 | -145.74 (exothermic) |
The endotherm and exothermal 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.
Description of key information
The substance decomposes before melt (between ca 268 - 424 °C).
Key value for chemical safety assessment
Additional information
OECD 102 and 113 - differential scanning calorimetry method
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