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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:
2013-12-11 - 2014-01-03
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:
European Commission Regulation (EC) No. 440/2008
Deviations:
no
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
71.4 °C
Atm. press.:
ca. 1 013.25 hPa
Decomposition:
no

The DSC measurements with a heating rate of 10 K/min showed an endothermal effects in the temperature range of 38 - 54 °C, 64 - 84 °C and 111 - 118 °C.


Melting point (DSC measurements)

































Ident No.



Test item/ mg



Starting temperature / °C



Final test temperature / °C



Temperature range (melting) /°C



Onset / °C



Crucible



34150



10.65



25



150



64-84



71.44



Aluminium with a hole



34152



9.33



25



150



64-84


 



71.30



Aluminium with a hole



 


The test item had a melting point of 71.4 °C.


Additional measurements with the capillary method were performed in order to identify the melting point from the three endothermal effects of the DSC measurements. The results are shown in table below.


 






























 



Set point



Heating rate



End point



Melting Range



Remarks



1



30 °C



10 K/min



140 °C



73.7 – 76.0 °C



Above 116.2 °C the dull sample clearified.



1



30 °C



10 K/min



140 °C



73.7 – 76.3 °C



Above 116.2 °C the dull sample clearified.



 


Thus it was concluded, that the second endothermal effect of the DSC can be related to melting.


 

Conclusions:
he DSC measurements (25 - 150 °C) showed that the test item had a melting point of 71.4 °C.
Executive summary:

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1. The  melting range was determined by differential scanning calorimetry (DSC 25 - 150 °C). The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded. The DSC measurements (25 - 150 °C) showed that the test item had a melting point of 71.4 °C under atmospheric conditions.

Description of key information

The test item had a melting point of 71.4 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
71.4 °C

Additional information

A study was conducted according to OECD test guideline 102, Regulation (EC) No 440/2008 method A.1. The melting point / melting range was determined by differential scanning calorimetry (DSC 25-150 °C). The test item and the reference are heated up from the starting temperature to the final temperature at a constant heating rate in a defined atmosphere (nitrogen). Open crucibles are used as containers for the test item and as empty reference crucible. The quantity of heat absorbed or released is measured and recorded. The test item had a melting point of 71.4 °C under atmospheric conditions.