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EC number: 272-695-0 | CAS number: 68909-18-2
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:
- 19 FEB 2010 to 9 NOV 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: EU Method A.2 (Boiling Temperature)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: OECD Guideline 103 (Boiling temperature)
- Deviations:
- no
- GLP compliance:
- yes
- Type of method:
- thermal analysis
- Melting / freezing pt.:
- -57.27 °C
- Decomposition:
- yes
- Decomp. temp.:
- 116.34 °C
- Conclusions:
- The mean melting point was -57.27°C and the boiling point was 116.34°C.
- Executive summary:
In run 1, a small endotherm with a peak at -57.45°C, possibly due to freezing/melting, was followed by an endotherm, with a peak at 121.53°C which was considered to be due to boiling.
In run 2, a small endotherm with a peak at -57.08°C, possibly due to freezing/melting, was followed by an endotherm with a peak at 111.14°C which was considered to be due to boiling.
Reference
Run 1
A small endotherm with a peak at -57.45°C, possibly due to freezing/melting, was followed by an endotherm, with a peak at 121.53°C which was considered to be due to boiling.
Run 2
A small endotherm with a peak at -57.08°C, possibly due to freezing/melting, was followed by an endotherm, with a peak at 111.14°C which was considered to be due to boiling.
Thermal Data for Melting/Freezing Temperatures, Boiling/Decomposition Temperatures
Parameter |
Run 1 |
Run 2 |
Mean |
Endotherm 1 |
|||
Onset (°C) |
-59.24 |
-59.21 |
-59.23 |
Peak (°C) |
-57.45 |
-57.08 |
-57.27 |
Enthalpy (J/g) |
-54.82 |
-49.04 |
51.93 |
Endotherm 2 |
|||
Onset (°C) |
81.18 |
105.82 |
93.5 |
Peak (°C) |
121.53 |
111.14 |
116.34 |
Enthalpy (J/g) |
-272.31 |
-252.04 |
262.18 |
Description of key information
In run 1, a small endotherm with a peak at -57.27°C was observed. In run 2, a small endotherm with a peak at -57.08°C was observed.
The mean of the two scans was given as the melting/freezing point.
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -57.27 °C
Additional information
The endpoint was determined in accordance with EU Method A.1 (Melting / Freezing Temperature) and OECD Guideline 102 (Melting point / Melting Range).
A sample was sealed in a vented aluminium DSC pan and scanned against a reference sample (an empty aluminium pan) from -60°C to 400°C at a heating rate of 10°C/minute after being held isothermally at -60°C for 15 minutes. Following examination of the results of this scan, a second test was performed. A second sample was scanned using the same temperature program.
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