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EC number: 252-563-9 | CAS number: 35441-13-5
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:
- April 27, 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
- Specific details on test material used for the study:
- The test item was used in its initial form.
- Melting / freezing pt.:
- 334 - 338.5 °C
- Decomposition:
- yes
- Decomp. temp.:
- 338.5 - 357.4 °C
- Conclusions:
- The substance undergoes melting at ca 334 - 338 °C, immediately followed by decomposition at ca 338.5 – 357.4 °C
- Executive summary:
The thermal behaviour of the test item was investigated by Differential Scanning Calorimetry method, according to the OECD guidelines 102 and 113. A small amount of test item placed in aluminum cosed crucible and inserted into the furnace of the DSC device. The temperature was increased from 25 to 500 °C with 10 °C/minutes heating rate. The measurement was performed under nitrogen atmosphere. The experiment was performed in duplicate.
In addition, a supplementary test was run, in order to clarify the substance thermal behavior. A small amount of test item was placed in closed aluminum crucible. The capsule was inserted into the furnace of the DSC device and heated from 25 up to 205 °C, 300 °C and 339 °C with 10 °C/minutes heating rate, than cooled down to 25 °C. Before and after the test, the weight and the appearance of the samples were determined.
Before the test the appearance of the substance was yellow powder. After the experiments the test item melted and blackened in the crucible and became smelly.
The melting point of the substance was determined to be in the range of 334.0 – 338.5 °C followed by a decomposition in the range of 338.5 – 357.4 °C. Based on the thermograms and the appearance of test item after the tests it is concluded that the test item started to decompose immediately after melting.
Conclusion
The substance undergoes melting at ca 334 - 338 °C, immediately followed by decomposition at ca 338.5 – 357.4 °C
Reference
Before the test the appearance of the substance was yellow powder. After the experiments the test item melted and blackened in the crucible and became smelly.
The melting point of the substance was determined to be in the range of 334.0 – 338.5 °C followed by a decomposition in the range of 338.5 – 357.4 °C. Based on the thermograms and the appearance of test item after the tests it is concluded that the test item started to decompose immediately after melting.
| Replicate | Sample weight [mg] | Total loss of Mass (%) | Onset of effect [°C] | Endset of effect [°C] | Left Limit [°C] | Right Limit [°C] | Energy [J/g] |
| Experiment 1 | 3.96 | 47.7 | 334.34 | 338.68 | 312.66 | 338.60 | 96.29 (endothermic) |
| Experiment 2 | 2.84 | 48.6 | 333.56 | 338.38 | 313.25 | 338.46 | 99.36 (endothermic) |
Mean |
333.95 | 338.53 | 312.96 | 338.53 | 97.83 | ||
| Experiment 1 | 3.96 | 47.7 | 338.60 | 343.88 | 338.60 | 356.95 | -57.90 (exothermic) |
| Experiment 2 | 2.84 | 48.6 | 338.46 | 342.55 | 338.46 | 357.75 | -67.44 (exothermic) |
Mean |
338.53 | 343.22 | 338.53 | 357.35 | -62.67 | ||
Supplementary Test
| Temperature range | Sample weight [mg] | Loss of Mass [%] | Observation | |
| Supplementary Test 1 | 25 - 205 | 3.06 | 4.9 | yellow powder |
| Supplementary Test 2 | 25 - 300 | 3.13 | 5.1 | yellow clumped powder |
| Supplementary Test 3 | 25 - 339 | 4.81 | 23.5 | smelly, black melt |
Description of key information
The substance undergoes melting at ca 334 - 338 °C, immediately followed by decomposition at ca 338.5 – 357.4 °C
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 334 °C
Additional information
OECD 102/113 - differential scanning calorimetry
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