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EC number: 240-212-2 | CAS number: 16068-37-4
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:
- 2015-11-19
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- The study is conducted in accordance with relevant test method but in compliance with ISO 9001:2008
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- GLP compliance:
- no
- Other quality assurance:
- other: ISO 9001:2008
- Type of method:
- differential scanning calorimetry
- Key result
- Melting / freezing pt.:
- -34 °C
- Atm. press.:
- 1 013 hPa
- Decomposition:
- no
- Key result
- Melting / freezing pt.:
- 239.2 K
- Atm. press.:
- 1 013 hPa
- Decomposition:
- no
- Conclusions:
- A melting point value of -34°C at 1013 hPa was determined for the substance using a relevant test method and in compliance with a known quality system (ISO 9001:2008). The result is considered to be reliable.
Reference
The DSC diagrams show an exothermic peak during the cooling step with an onset temperature at –55.7°C (test1), –53.4°C (test 2). During the heating step an endothermic peak is detected with an onset temperature at –34.1°C (test1), –33.8°C (test 2). See attached DSC thermograms 1 and 2.
The melting point of the substance was confirmed using a cloud point in accordance with ISO 3015, see 4.2.763 (Haas 2016).
Results (DSC)
Test |
Melting/freezing temperature |
1 |
-34.1°C (239.1 K) |
2 |
-33.8°C (239.4 K) |
Mean value |
-34.0°C (239.2 K) |
Description of key information
Melting point: -34.0°C at 1013 hPa (OECD 102)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -34 °C
Additional information
Two reliable measured melting point studies are available from the same study author (Haas 2016) for the submission substance. A melting point value of -34°C at 1013 hPa was determined for the substance using Differential Scanning Calorimetry (DSC) in accordance with OECD Test Guideline 102. The result is considered to be reliable and is selected as key study. The melting point obtained using the DSC method was confirmed by the use of a Cloud Point method in accordance with ISO 3015 Test Method. Melting point value of -37°C at 1013 hPa was obtained for the substance.
In a secondary source to which reliability could not be assigned, melting point value of <0°C was reported for the substance.
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