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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:
from 2020-12-04 to 2020-12-09
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
1995
Deviations:
no
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
2008
Deviations:
no
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Key result
Melting / freezing pt.:
246 °C
Atm. press.:
979 hPa
Decomposition:
yes
Decomp. temp.:
246 °C
Remarks on result:
other: The test item starts to melt and decompose simultaneously.

In the temperature range of 240 - 250 °C a distinct endothermic effect was observed. Between 270 - 290 °C, 290 - 310 °C and 310 - 410 °C three further consecutive endothermic effects could be detected.


 






























Measurement No.



Sample weight / mg



Onset of Effect / °C



Range of effect / °C



Weight loss / mg



Atmospheric pressure / hPa



PN20620



9.73



242.72


-


-


-



240 – 250 (endo)


270 – 290 (endo)


290 – 310 (endo)


310 – 410 (endo)



7.24



978.5



PN20621



9.77



243.03


-


-


-



240 – 250 (endo)


270 – 300 (endo)


300 – 310 (endo)


310 – 410 (endo)



7.18



978.7



Since the test item showed four endothermic effects, which could not be clearly assigned to the melting or boiling of the test item, respectively, the capillary method was performed. Therefore, three capillaries were filled with the test item and heated simultaneously from 22 °C to 280 °C at a heating rate of 10 K/min. At a temperature of 246 °C it was found that the test item starts to melt and decompose at the same time. The decomposition was determined by a brown colouration. At 270 °C the samples rose in the capillaries. The test was terminated at a temperature of 280 °C.

Conclusions:
The test item starts to melt and decompose simultaneously at 246 °C.
Executive summary:

An experimental study was conducted according to Regulation (EC) No 440/2008 Methods A.1. and OECD Test Guidelines 102 to determine the melting point of the test item using differential scanning calorimetry. Since the test item showed four endothermic effects, which could not be clearly assigned to the melting of the test item also the capillary method was performed. At a temperature of 246 °C it was found that the test item starts to melt and decompose at the same time. The decomposition was determined by a brown colouration.

Description of key information

The test item starts to melt and decompose simultaneously at 246 °C (reference 4.2-1).

Key value for chemical safety assessment

Additional information

An experimental study was conducted according to Regulation (EC) No 440/2008 Methods A.1. and OECD Test Guidelines 102 to determine the melting point of the test item using differential scanning calorimetry. Since the test item showed four endothermic effects, which could not be clearly assigned to the melting of the test item also the capillary method was performed. At a temperature of 246 °C it was found that the test item starts to melt and decompose at the same time. The decomposition was determined by a brown colouration.