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Diss Factsheets

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:
Test dates: Apr.19 to Jul.5, 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Remarks:
The study was conducted according to an internationally recognised method, and under GLP; experimental details are missing, but not considered critical for the assessment. The substance is adequately identified. Therefore full validation applies.
Qualifier:
according to guideline
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
no
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
GIPC; effective Jun.14, 2012, signed on Jan.10, 2013
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
Storage conditions of test material: At room temperature protected from direct sunlight.
Key result
Melting / freezing pt.:
-108.9 °C

Table 4.2/1: Observed onset temperature:


























Test n°



Onset temperature



1



-108.5 °C



2



-109.0 °C



3 



-109.2 °C



Mean ± S.D.



-108.9 ± 0.4 °C



 


Three succesive test were retained.


 


Mean onset for melting occured at -108.9 °C ± 0.4 °C. The validity criteria were fulfilled; the standard deviation within the three replicate assessments did not exceed 0.5 °C.


 


Therefore, the average value is retained as final test.


 

Executive summary:

The melting point of the test substance was determined under GLP according to EU A1 guideline, using differential scanning calorimetry (DSC) method.


Three main runs were performed, and the mean final temperature was retained.


Under the test conditions, the mean onset for melting occured at -108.9 °C ± 0.4 °C.

Description of key information

Melting point (i.e. transition from solid to liquid) = -108.9°C (experimental, EU A1, DSC, GLP).

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-108.9 °C

Additional information

A fully reliable experimental study, conducted according to a recognized EC method and under GLP, is available.
It is considered as a key study, and the result is retained as key data.