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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:
21 Februar 2022 - 8 March 2022
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
GLP compliance:
yes (incl. QA statement)
Type of method:
differential scanning calorimetry
Specific details on test material used for the study:
SOURCE OF TEST MATERIAL
- Source (i.e. manufacturer or supplier) and lot/batch number of test material: Manufacturer, UA21412002
- Purity, including information on contaminants, isomers, etc.: Content: 75% 3-(N,N-Dimethyl)propyl-urea and 25% Polyethylenglycol

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
- Storage condition of test material: Store container tightly closed at a well-ventilated place. Store in the original container. Do not store with acids.
Key result
Melting / freezing pt.:
-47 °C
Atm. press.:
1 011 hPa

During the heating phase a distinct endothermic effect was observed in the temperature range of -50 to -40 °C, which can be assigned to the melting of the test item. As the test item is a mixture, it has a melting range starting at -47.7 °C.


Table 1:     Results of the DSC-measurements






























Measurement No.



Sample weight /
mg



Onset of Effect /
°C



Range of effect /
°C



Weight loss /
mg



Atmospheric pressure /
hPa



PN23121



8.81



-47.71



-50 – -40 (endo)



8.81



1011



PN23122


 



8.53



-49.28



-50 – -40 (endo)



8.53



1011


Conclusions:
The test item PU-2021-971 has a melting range starting at -47.7 °C at atmospheric pressure (1011 hPa) as determined by Differential Scanning Calorimetry according to Regulation (EC) No 440/2008 Method A.1. and OECD Test Guideline 102 (1995).

Description of key information

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
-47 °C

Additional information