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Physical & Chemical properties

Melting point / freezing point

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Reference
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).

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.

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).

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)