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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:
03 APR 2000 - 21 JUN 2000
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to same study
Reason / purpose for cross-reference:
reference to other study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
Guuideline 92/69/EEC of 31 July 1992
Deviations:
no
GLP compliance:
yes
Type of method:
differential scanning calorimetry
Melting / freezing pt.:
64.8 °C
Decomposition:
no
Sublimation:
no
Remarks on result:
other: refer to 'Remarks'
Remarks:
no atm. pressure mentioned in the report, but 1013 hPa as standard conditions can be assumed

The measurement in a closed glass pan shows an endothermic effect (melting) in the range 50-90 °C, with an onset of 64 °C, a small endothermic effect at a temperature of ca. 125 °C (transition of the liquid crystalline to the isotropic phase; information by the producer) and an exothermal decomposition in the range 185-310 °C, with a decomposition energy of 268 J/g, and a second one in the range 355-450 °C, with a decomposition energy of 328 J/g.

In aluminium pans, the diagrams show the endothermal effect (melting) in the range between 50 and 80 °C, with a medium onset of 64.8 °C, a small endothermic effect at a temperature of ca. 125 °C and an exothermal decomposition beginning at about 190 °C.

Conclusions:
The mean melting point is 64.8 °C.
Executive summary:

The determination of the melting point was carried out by differential scanning calorimetry (DSC) according to Guideline 92/69/EEC A.1. under GLP conditions. The melting point is referred to the onset temperature. The mean melting point is 64.8 °C.

Description of key information

The determination of the melting point was carried out by differential scanning calorimetry (DSC) according to Guideline 92/69/EEC A.1. under GLP conditions. The melting point is referred to the onset temperature. The mean melting point is 64.8 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
64.8 °C

Additional information

No atm. pressure is mentioned in the report, but 1013 hPa as standard conditions can be assumed.