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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:
06 July 2011 to 07 July 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Principles of method if other than guideline:
The Differential Scanning Calorimetry method was used. The test material was heated from -150 °C to 0 °C at a constant heating rate in a defined atmosphere. The quantity of heat absorbed or released was measured and recorded.
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
ca. -76.3 °C
Decomposition:
no
Sublimation:
no
Remarks on result:
other: The atmospheric pressure that the test was carried out under were not reported. The test was carried out under a defined atmosphere of pure nitrogen.

- Due to the high volatility of test material the measurements were performed in closed glass crucibles.

- Both measurements in closed glass crucibles showed an endothermic effect in the temperature range -80 to -64 °C. The onset temperature is derived from the intersection of the tangent line with the highest slope of the endothermic peak with the baseline.

- The mean melting point of the test material was -76.3 °C. After the test the test material was liquid and red brown coloured.

Table 1: Results

Indent No.

Onset (°C)

Temperature Range (°C)

Crucible

31922

-76.30

-80 to -64 °C

closed glass crucibles

31923

-76.22

-80 to -64 °C

closed glass crucibles

Conclusions:
Under the conditions of this study, the test material showed a melting point of -76.3 °C, changing its colour to red-brown.
Executive summary:

The melting point of the test material was investigated in accordance with the standardised guidelines OECD 102 and EU Method A.1, under GLP conditions.

The melting point of the test material was determined using differential scanning calorimetry.

Under the conditions of this study, the test material showed a melting point of -76.3 °C, changing its colour to red-brown.

Description of key information

Dornhagen 2011

Under the conditions of this study, the test material showed a melting point of -76.3 °C, changing its colour to red-brown.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-76.3 °C

Additional information

Dornhagen 2011

The melting point of the test material was investigated in accordance with the standardised guidelines OECD 102 and EU Method A.1, under GLP conditions. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

The melting point of the test material was determined using differential scanning calorimetry.

Under the conditions of this study, the test material showed a melting point of -76.3 °C, changing its colour to red-brown.

Merck Index 1996

According to the handbook data the melting point of the test material is -66.5 °C.

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