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Physical & Chemical properties

Melting point / freezing point

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melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2008-10-27 till 2009-01-06
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
EU Method A.1 (Melting / Freezing Temperature)
according to guideline
OECD Guideline 102 (Melting point / Melting Range)
GLP compliance:
Other quality assurance:
ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
-103 °C

A preliminary thermo gravimetric measurement was performed over a temperature range from room temperature to 240 °C.

Beginning at room temperature the mass loss rate increased steadily, reaching a maximum at 94°C and exhibiting a small shoulder in the DTG curve at 107°C,. Mass loss was complete at 115°C, taking into account the initial mass loss from purging (21.7%) before the start of the measurement. There was no residue left.

The DSC measurements were performed twice. To determine a possible boiling point more precisely a crucible lid with a hole of 50 Om diameter was used in the measurements. The small hole causes the generation of a defined atmosphere at constant pressure inside the crucible and allows measurements at near equilibrium conditions, thus preventing evaporation of the test material before reaching the boiling point.

The sample was quenched down to -150°C. Upon heating the enthalpy curves show a small exothermic peak at -135°C (crystallisation) and a small endothermic peak at -103°C (melting). Since both enthalpy effects are rather small, the sample most likely had crystallized only partially.

Upon further heating, one sharp endothermic peak with a peak maximum temperature at 123°C and an extrapolated onset temperature of 119.3°C, indicating the boiling temperature at ambient pressure, is registered. Reweighing after the measurement, no residue was detectable.

The melting point of Oxooel LS9 was measured to be -103°C.
Executive summary:

The melting point of Oxooel LS9 was measured to be -103°C.

Description of key information

The melting point of Oxooel LS9 was measured to be -103°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
170 K

Additional information

The melting point of Oxooel LS9 was measured to be -103°C.