Registration Dossier
Registration Dossier
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EC number: 225-863-2 | CAS number: 5124-30-1
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:
- 2009-10-26 to 2010-04-09
- 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:
- (1995)
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- (2008)
- Deviations:
- no
- GLP compliance:
- yes (incl. QA statement)
- Type of method:
- other: Dynamic differential scanning calorimetry
- Remarks on result:
- not determinable
- Remarks:
- No melting point was found between - 150 °C and + 50 °C. A glass transition was observed at - 74 °C. This reflect the fact that the test substance is a complex mixture of isomers that hardly find common crystalline structure upon cooling. Under favourable conditions, i.e. after slow cooling to - 60 °C followed by slow heating, an indication of melting could be observed at approx. 20 °C (Aqura, 2010).
- Conclusions:
- No melting point was found between - 150 °C and + 50 °C. A glass transition was observed at - 74 °C. Under favourable conditions, i.e. after slow cooling to - 60 °C followed by slow heating, an indication of melting could be observed at approx. 20 °C (Aqura, 2010).
- Executive summary:
The melting temperature was determined by differential scanning calorimetry according to OECD guideline 102.
No melting point was found between - 150 °C and + 50 °C. A glass transition was observed at - 74 °C. This reflect the fact that the test substance is a complex mixture of isomers that hardly find common crystalline structure upon cooling. Under favourable conditions, i.e. after slow cooling to - 60 °C followed by slow heating, an indication of melting could be observed at approx. 20 °C (Aqura, 2010).
Reference
An additional trial with slow cooling rate (-2 K/min) down to - 60 °C (above the glass point) was performed and showed no crystallisation, however, upon heating a very small endothermic peak at approx. 20 °C is registered.
Description of key information
No melting point was found between - 150 °C and + 50 °C. A glass transition was observed at - 74 °C. This reflect the fact that the test substance is a complex mixture of isomers that hardly find common crystalline structure upon cooling. Under favourable conditions, i.e. after slow cooling to - 60 °C followed by slow heating, an indication of melting could be observed at approx. 20 °C
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- -74 °C
Additional information
Reference:
AQura, 2010
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
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