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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:
2016-11-25
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
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
>= 76 - <= 78 °C
Atm. press.:
1 013.25 hPa
Decomposition:
no
Sublimation:
no

Two DSC measurements with a heating rate of 10 K/min showed an endothermal effect (melting) in the temperature range of 75 - 90 °C. The onset temperature (see Table 1) was derived from the intersection of the tangent line with the highest slope of the endothermal peak with the baseline.

 

 

Test item / mg

Starting temperature /

°C

Final test temperature /

°C

Temperature range (melting) /°C

Onset /

°C

Crucible

Observations

after the measurement

8.33

25

500

7 5 - 9 0

77.64

Aluminium with a hole

 

9.28

25

150

7 5 - 8 5

76.46

Aluminium with a hole

Test item was a solidified melt

The test item had a melting range of 76 - 78 °C.

Conclusions:
The melting point was determined to be in range of 76-78 °C at 1013.25 hPa.
Executive summary:

A study was conducted according to OECD TG 102 and Regulation (EC) No 440/2008 method A.1 to determine the melting point of the test item using differential scanning calorimetry and capillary. The test item was weighed into an aluminium crucible under an inert atmosphere (nitrogen). Three tests with about 8 - 9 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The DSC measurement with a heating rate of 10 K/min up to the final temperature of 500 °C showed one endothermal effect (melting) in the temperature range of 75 - 90 °C. One additional DSC measurement with a heating rate of 10 K/min up to the final temperature of 150 °C showed one endothermal effect (melting) in the temperature range of 75 -85 °C. The onset of the endothermal effects differed by more than 2 K. Thus, it was concluded that, the test item had a melting range of 76-78 °C at 1013.25 hPa.

Description of key information

The melting point was determined to be in range of 76-78 °C at 1013.25 hPa.

Key value for chemical safety assessment

Additional information

A study was conducted according to OECD TG 102 and Regulation (EC) No 440/2008 method A.1 to determine the melting point of the test item using differential scanning calorimetry and capillary (reference 4.2 -1). The test item was weighed into an aluminium crucible under an inert atmosphere (nitrogen). Three tests with about 8 - 9 mg of the test item were performed. As reference crucible, an empty aluminium crucible was used. The DSC measurement with a heating rate of 10 K/min up to the final temperature of 500 °C showed one endothermal effect (melting) in the temperature range of 75 - 90 °C. One additional DSC measurement with a heating rate of 10 K/min up to the final temperature of 150 °C showed one endothermal effect (melting) in the temperature range of 75 -85 °C. The onset of the endothermal effects differed by more than 2 K. Thus, it was concluded that, the test item had a melting range of 76-78 °C at 1013.25 hPa.