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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:
01 July 2016
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary method
Key result
Melting / freezing pt.:
187.9 °C

Using a linear heating rate of 0.5 °C/min, the melting point of the test material was found to be 187.9±0.04 °C (95 % confidence interval), i.e. 461.0 K.

 

Measured temperatures corresponding to the melting of the test item (three experiments (I, II, III) with three parallel samples each (1, 2, 3).

 

 

Measured temperatures during the main study (°C)

 

I/1

I/2

I/3

II/1

II/2

II/3

III/1

III/2

III/3

Mean

Melting point

187.8

187.8

187.8

187.9

187.9

187.9

187.9

187.9

187.9

187.9 ± 0.04

 

Conclusions:
Under the conditions of the study the melting point of the test material was found to be 187.9 ± 0.04 °C (95 % confidence interval), i.e. 461.0 K.
Executive summary:

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

Three capillaries containing the test material were placed into the apparatus, the block was heated from 180 to 195 °C at 0.5 °C/min heating rate. The transformations of the test material were observed visually through the magnifying glass. Three parallel experiments were carried out and in each case three parallel samples were measured. The mean of the measured temperatures was determined. The atmospheric pressure was 980 hPa.

Under the conditions of the study the melting point of the test material was found to be 187.9 ± 0.04 °C (95 % confidence interval), i.e. 461.0 K.

Description of key information

Under the conditions of the study the melting point of the test material was found to be 187.9 ± 0.04 °C (95 % confidence interval), i.e. 461.0 K.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
187.9 °C

Additional information

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

Three capillaries containing the test material were placed into the apparatus, the block was heated from 180 to 195 °C at 0.5 °C/min heating rate. The transformations of the test material were observed visually through the magnifying glass. Three parallel experiments were carried out and in each case three parallel samples were measured. The mean of the measured temperatures was determined. The atmospheric pressure was 980 hPa.

Under the conditions of the study the melting point of the test material was found to be 187.9 ± 0.04 °C (95 % confidence interval), i.e. 461.0 K.