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EC number: 254-663-8 | CAS number: 39872-57-6
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:
- 21 Mar - 28 Aug 2017
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 1995
- Qualifier:
- according to guideline
- Guideline:
- EPA OPPTS 830.7200 (Melting Point / Melting Range)
- Version / remarks:
- 1998
- Qualifier:
- according to guideline
- Guideline:
- other: CIPAC MT 1: Freezing Point
- Version / remarks:
- 2009
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- -83.2 °C
- Atm. press.:
- 1 001 - 1 003 hPa
- Decomposition:
- no
- Conclusions:
- A melting point of -83.2 °C at 1001-1003 hPa was determined for the test substance according to E.U. Method A.1.
Reference
In the temperature range of -90 to -70 °C, a small endothermic effect (melting) was observed. Between approx. 60 - 280 °C a second endothermic effect (boiling) could be detected. No further thermal effects were observed up to the test end temperature of 500 °C.
Results of the DSC-measurements
No. |
Sample weight / mg |
Onset of Effect / °C |
Range of effect / °C |
Weight loss / mg |
Atmospheric pressure / hPa |
PN13074 |
14.95 |
-83.13 250.57 |
-90 to -70 (endo) 70 - 280 (endo) |
14.85 |
1002.6 |
PN13308 |
14.65 |
-83.18 250.95 |
-90 to -70 (endo) 60 - 280 (endo) |
14.64 |
1001.0 |
During the cooling phase, no thermal effects were observed in the temperature range from 25 to -100 °C.
During the heating phase a small endothermic effect was observed in the temperature range of -90 to -70 °C, which can be assigned to the melting of the test item. As the onset temperatures in both tests deviate by less than 0.5 K from their mean value of -83.16 °C, the test item has a melting point of -83.2 °C.
Due to the small melting peak, the melting of the test item was verified. 2.0 g of the test item in a test tube were cooled down with liquid nitrogen to approx. -90 °C. In the temperature range of approx. -90 to -85 °C the test item was solid. The appearance of the test item during warming up: at approx. -75 °C very viscous, at -60 °C viscous. Therefore the melting point in the DSC-measurement was confirmed.
Final Results
The test item has a melting point of -83.2 °C at atmospheric pressure (1001 - 1003 hPa) as determined by differential scanning calorimetry according to Regulation EC No. 440/2008 Method A.1. and OECD Test Guideline 102 (1995).
Description of key information
Melting point: -83.2 °C at 1001-1003 (EU Method A.1, differential scanning calorimetry)
Key value for chemical safety assessment
Additional information
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