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Diss Factsheets

Physical & Chemical properties

Melting point / freezing point

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
melting point/freezing point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
6 Feb - 13 Mar 2002
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
Test method A.I (section 1.4.4.1), "determination of the melting
point", described in the EG- guideline 92/69.
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
thermal analysis
Remarks:
The sample is closed up in a crucible made of aluminium. The sample is cooled down in liquid nitrogen and then heated up in a DTA-system (heating rate 1 K/min). In comparison with an inert sample the temperature difference and the heat effect is recorded.
Key result
Melting / freezing pt.:
17.5 °C
Decomposition:
no
Sublimation:
no
Remarks on result:
other: No atmospheric pressure is stated.

The key value is the mean of four measured values - two were determined in closed and two in open crucible:


17.0°C ; 17.4°C (closed crucible)
17.7 °C ; 17.7 °C (open crucible).


Up to a temperature of 300 °C there is no thermal decomposition of the test substance (measured with Differential Thermal Analysis: The sample is closed up in a crucible made of glass. The sample is heated up in a DTA-system (heating rate 5 K/min). In comparison with an inert sample (empty crucible) the temperature difference and the heat effect is recorded. Any thermal effect corresponds to a baseline deviation). 


 


Validity criteria for the measurement of the melting point:

























Target condition according to guideline:Actual condition according to the study:Validity criteria met:
The heating rate should not exceed 2 K/min.Heating rate 1 K/min.Yes
The mean of at least two measurements which are in the range of the estimated accuracy is reported as the melting temperature.Two values were determined, each in closed and open crucible.Yes
If the substance decomposes or sublimes before the melting temperature is reached, the temperature at which the effect is observed shall be reported.The test substance was heated up to a temperature of 300°C - no thermal decomposition was observed.Yes

 

Conclusions:
The melting point of the test substance is 17.5°C.
Up to a temperature of 300 °C there is no thermal decomposition of the test substance.
Executive summary:

The melting point of the test substance is 17.5°C.
Up to a temperature of 300 °C there is no thermal decomposition of the test substance.

Description of key information

The melting point of the test substance is 17.5 °C.
Up to a temperature of 300 °C there is no thermal decomposition of the test substance.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
17.5 °C

Additional information