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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:
03.07.2015-07.01.2016
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)
Deviations:
no
GLP compliance:
no
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
99 °C
Atm. press.:
ca. 1 013.25 hPa
Decomposition:
no

Three DSC measurements with a heating rate of 10 K/min showed a first endothermal effect in the temperature range of 50 - 70 °C and the second in the temperature range 100 - 110 °C.


 


 


Melting point (DSC measurements)














































Ident No.



Test item/ mg



Starting temperature / °C



Final test temperature / °C



Temperature range (melting) /°C



Onset / °C



Crucible



Observations after the measurement



35145



8.05



25



500



50-70


100-110



55.0



Aluminium with a hole



--



35148



9.48



25



500



50-70


100-110



56.2



Aluminium with a hole



--



35151



12.05



25



150



52-70


99-104


 



54.7


99


 



Aluminium with a hole



Test item was a solidified melt after the measurement



 


A additional measurement with the capillary method was performed to clarify the results of the DSC measurements. Since this measurement was performed only as a verifying screening a high heating rate of 10 K/min was chosen and therefore the absolute temperature values derived with the capillary method are not as accurate as the DSC results. The filling height of the test item was approximately 5 mm.


 


Results of the capillary method




















No.



Set point/°C



Heating rate/ K/min



Endpoint/ °C



Remarks



1



30



10



150



Approx. 56 °C: test item started to melt


Approx. 58 °C: test item appeared melted and tubid


Approx. 100°C: test item appeared melted and clear



 


The capillary method measurement showed that the test item melted during the second step of the


endothermal effect observed in the DSC measurement.


The test item had a melting point of 99.0 °C.

Conclusions:
The test item had a melting point of 99.0 °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. 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. A measurement with the capillary method was performed to clarify the results of the DSC measurements.


The test item showed an endothermal effect in the temperature range of 50 - 70 °C and in the range of 100 - 110 °C.  An additional measurement with the capillary method was performed in order to clarify the melting range. Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item melted within a range of 99.0 °C.

Description of key information

The test item had a melting point of 99.0 °C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
99 °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 25-500 °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 showed  endothermal effects in the temperature range of 50 - 70 °C and 100 - 110 °C.  An additional measurement with the capillary method was performed in order to clarify the melting range. Under consideration of the results from the DSC measurements and the capillary method it was concluded that the test item had a melting point of 99.0 °C.