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EC number: 260-350-7 | CAS number: 56706-10-6
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:
- 1998-03-20 to 1998-03-23
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Remarks:
- The study was conducted according to an appropriate EU test method but was not compliant with GLP.
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 92/69/EWA
- GLP compliance:
- no
- Type of method:
- differential scanning calorimetry
- Key result
- Remarks on result:
- other: No melting/freezing observed when the sample was heated between 25°C to -140°C, but glass transition was observed at around -117°C.
- Conclusions:
- In a reliable study conducted according to EU Method A.1 (Melting/Freezing Point) Differential Scanning Calorimetry, the substance did not melt but underwent a glass transition with an extrapolated onset temperature of ca. -118°C and a glass transition temperature of ca. -117°C.
Reference
Cooling down the 10.52 mg-sample from 25°C to -140°C with a cooling rate of 2K/min no endothermic crystallisation (first-order transition) can be seen, but a weak glass transition (second-order transition) at -117.5°C (extrapolated onset) and -119.3°C (glass transition temperature) was observed. On heating up the frozen sample from -140°C to 0°C, no endothermic melting ( transition from solid crystalline state to the liquid state) was observed, but now a strong glass transition at -118.6°C ( extrapolated onset) and -117.5°C (glass transition temperature) occured. After cooling a second time to -140°C and once more heating, the glass transition was seen at -118.2°C resp. -117.4°C.
The 10.01 mg sample showed a glass transition at -117.1°C (extrapolated onset) resp. -116.4°C (glass transition temperature).
The thermograms are attached.
Description of key information
Melting point: < -20°C at 1013 hPa (EU Method A.1)
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -20 °C
Additional information
In a reliable study conducted according to EU Method A.1 (Melting/Freezing Point) using Differential Scanning Calorimetry (DSC) method, the sample was cooled between 25°C and -140°C; the substance did not melt but underwent a glass transition with an extrapolated onset temperature of ca. -118°C and a glass transition temperature of ca. -117°C. No other reliable studies are available, so this is considered the key result.
A pour point of approximately -35°C at 1013 hPa and a melting point of approximately -80°C at 1013 hPa were reported in secondary sources to which reliability could not be assigned.
The available data are considered sufficient to indicate that the melting/freezing point of the submission substance is below the threshold of -20°C specified in Column 2 of REACH Annex VII.
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