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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:
12-Nov-2009 to 18-Nov-2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
Principles of method if other than guideline:
The test item was cooled down to -100 °C at a heating rate of 0.25 K/min, hold at -100°C for one hour and heated up to the final temperature (50°C) at a constant heating rate (10 K/min) in a defined atmosphere (nitrogen). The quantity of heat absorbed or released was measured and recorded. Aluminium crucibles with a small hole were used as containers for the test item and as empty reference crucible. About 25 - 28 mg of the test item were used.
GLP compliance:
no
Type of method:
other: DSC-method
Specific details on test material used for the study:
- Purity: 99.72%
- Batch: not mentioned
Melting / freezing pt.:
-53.3 °C
Atm. press.:
1 013.3 hPa
Decomposition:
no
Sublimation:
no

Two DSC-runs in aluminium crucibles with a hole showed an endothermic effect within a temperature range of -72 to -25°C with an onset temperature of -53°C. The test item has a mean melting point of -53.3°C.

Ident-No.

Onset / °C

Temperature range / °C

Crucible

29799

-53.48

-72 to -28°C

Aluminium with a hole

29822

-53.20

-72 to -25°C

Aluminium with a hole
Conclusions:
The freezing point was determined to be -53.3°C°C at 1013 hPa using the DSC-method.
Executive summary:

The measurement of the freezing point was performed in 2009 using the DSC-method at atmospheric pressure. The freezing point was determined to be -53.3°C°C at 1013 hPa.

Description of key information

The freezing point was determined to be -53.3 °C using the DSC-method.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-53.3 °C

Additional information