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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:
from 2017-03-16 to 2017-03-20
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
Qualifier:
according to guideline
Guideline:
EPA OPPTS 830.7200 (Melting Point / Melting Range)
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
capillary method
Key result
Melting / freezing pt.:
334.7 °C
Atm. press.:
1 013.25 hPa
Decomposition:
no
Sublimation:
no

During the preliminary test using a linear heating rate of 10 °C/min the phase transition of test item was observed at 356 °C.

At the end of each measurement the samples at the bottom of the capillary were melted and their color became yellow. The other part of the test item was moved to the upper part of the capillary, was hardened and its color became brown. After the samples cooled down to room temperature, the appearance of the samples remained as the above-mentioned, the changes were irreversible.

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

Sample Temperature (°C) Mean (°C) Standard
Deviation

Confidence
interval

(95 %)
I/1 335.3 334.7 0.75 0.57
I/2 334.3
I/3 334.3
II/1 333.9
II/2 335.4
II/3 335.8
III/1 334.8
III/2 334.8
III/3 333.5
Conclusions:
The melting point of the test item was determined to be 334.7 °C (607.8 K) at 1013.25 hPa.
Executive summary:

A study was performed according to OECD TG 102, Regulation (EC) No 440/2008 method A.1 and OPPTS 830.7200 in order to determine the melting point of the test item by using the capillary method. In the main test three experiments with three replicates each were performed. A small amount of the test item was heated in the electronic controlled sample block with 0.5 °C/min and the temperature in the sample block was displayed, respectively. The starting temperature was 330 °C based on the preliminary test. While raising the temperature, the melting point was detected based on thermo-optical changes. The mean melting point of the test item was determined to be 334.7 °C (607.8 K).

Description of key information

The melting point of the test item was determined to be 334.7 °C (607.8 K) at 1013.25 hPa.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
334.7 °C

Additional information

A study was performed according to OECD TG 102, Regulation (EC) No 440/2008 method A.1 and OPPTS 830.7200 in order to determine the melting point of the test item by using the capillary method (reference 4.2-1). In the main test three experiments with three replicates each were performed. A small amount of the test item was heated in the electronic controlled sample block with 0.5 °C/min and the temperature in the sample block was displayed, respectively. The starting temperature was 330 °C based on the preliminary test. While raising the temperature, the melting point was detected based on thermo-optical changes. The mean melting point of the test item was determined to be 334.7 °C (607.8 K).