Registration Dossier
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EC number: 249-649-3 | CAS number: 29461-14-1
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:
- 2016-08-02 to 2016-11-15
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 1998
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- -22 °C
- Atm. press.:
- 1 001 hPa
- Decomposition:
- no
- Conclusions:
- The melting point of the test item was found to be -22°C at 1001 hPa.
- Executive summary:
The melting point of the test item was determined by differential scanning calorimetry according to OECD 102. The test item showed a first endothermic signal (melting point) in the temperature range -40 to 20°C and a second endothermic signal, corresponding to boiling point, in the temperature range of 160 -320°C. The melting point corrected to the standard pressure was found to be -22°C.
Reference
Detailed results:
| Replicate | sample weight (mg) | Onset of effect (°C) | Range of effect (°C) | Atmospheric pressure (hPa) |
| 1 | 18.19 | -21.62 | -40 to 10 (endo) | 1003.8 |
| 2 | 16.69 | -22.26 | -40 to 20 (endo) | 1001.4 |
As the onset temperatures in both tests deviate by less than 0.5 K from their mean value of -21.94 °C, the test item has a melting point of -22 °C.
Observations:
During the cooling phase, an exothermal effect in the temperature range of -22 to -23 °C was observed, which can be assigned to the freezing of the test item. During the heating phase a broad endothermic effect (double peak) was observed in the temperature range of -40 to 20 °C, which can be assigned to the melting of the test item.
Additional test:
Due to the broad melting peak, the melting of the test item was verified. 3.8 g of the test item in a test tube were cooled down with liquid nitrogen to approx. -38 °C. In the temperature range of approx. -38 to -30 °C the test item was solid. The appearance of the test item during warming up: at approx. -20 °C very viscous, at -18 °C partly liquid. Therefore the melting point in the DSC-measurement was confirmed.
Description of key information
For this endpoint, one study is available in which the melting point is determined according to OECD 102. The melting point of the test item was found to be -22°C at 1001 hPa.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -22 °C
Additional information
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