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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:
18 November 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)
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary method
Melting / freezing pt.:
201.9 °C
Remarks on result:
other: ± 0.23 °C (95 % confidence interval)

Results:

Using a linear heating rate of 0.5 °C/min, the melting point of the test material was found to be 201.9 ± 0.23 °C (95% confidence interval), equivalent to 475.1 K.

Table 1: Temperatures Measured in the Main Test

 

Measured Temperatures (°C)

I/1

I/2

I/3

II/1

II/2

II/3

III/1

III/2

III/3

Mean

Melting Point

201.9

202.0

202.0

202.2

202.3

202.2

201.5

201.6

201.6

201.9 ± 0.23
Conclusions:
Under the conditions of the test, the melting point of the test material was determined to be 201.9 ± 0.23 °C (475.1 K) using the capillary method.
Executive summary:

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

Three capillaries containing the test material were placed into a digital melting point device, the block was heated from 195 °C to 220 °C at a 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.

Under the conditions of the study, the melting point was determined to be 201.9 ± 0.23 °C, equivalent to 475.1 K.

Description of key information

201.9 ± 0.23 °C, equivalent to 475.1 K, OECD 102, EU Method A.1, Sárvári (2012a).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
201.9 °C

Additional information

In the key study (Sárvári, 2012a) the melting point of the test material was determined using the capillary method under GLP conditions and in accordance with the standardised guidelines OECD 102 and EU Method A.1. Accordingly the study was assigned a reliability score of 1 in line with the principles set forth by Klimisch (1997).

Three capillaries containing the test material were placed into a digital melting point device, the block was heated from 195 °C to 220 °C at a 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.

Under the conditions of the study, the melting point was determined to be 201.9 ± 0.23 °C, equivalent to 475.1 K.