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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:
January 21 – 24, 2013
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted and documented study under Internal management system, according to OECD and EU guidelines, certificate of analysis is included in the report.
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Version / remarks:
May 31, 2008
Deviations:
yes
Remarks:
see under "Principles of method if other than guideline" regarding deviations
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Version / remarks:
Adopted July 27, 1995
Deviations:
yes
Remarks:
see under "Principles of method if other than guideline" regarding deviations
Principles of method if other than guideline:
The glass tube method uses a bigger glass tube than the capillary method (capillary method: 8 to 10 cm in length and 1.0 mm inner diameter)
- When the substance is solid at the initial test temperature, heating in the glass tube method is done in steps, whereas the capillary method uses a constant heating rate
- The capillary method described by OECD 102 can only be used to determine melting temperatures of substances that are solid at ambient temperature. There is no provision in this Guideline for determination of the melting point of substances that are liquid at ambient temperature. The glass tube method allows determination of a melting point below ambient temperature by bringing liquid substances to the solid state first by cooling. Supercooling is avoided by grafting (when necessary) and stirring the substance during cooling. The glass tube method allows determination of melting temperatures down to -25°C.
These deviations are not expected to have affected the outcome of the study.
GLP compliance:
no
Type of method:
capillary method
Melting / freezing pt.:
7 °C

The appearance of the sample at each step is mentioned below.

  The appearance of the sample at each step is mentioned below.

 

1stexperiment

  • at -6°C  :partly solid, partly liquid
  • at 3.5°C           : still partly solid, but amount of solid is less
  • at 4.4°C           : still partly solid
  • at 5.2°C           : still partly solid
  • at 6.0°C           : only very small amount of solid
  • at 6.8°C           : completely liquid

 

2ndexperiment

  • at -6°C : partly solid, partly liquid
  • at 4.5°C           : still partly solid, but amount of solid is less
  • at 5.6°C           : only very small amount of solid
  • at 6.6°C           : completely liquid

 

The melting point of the test substance is 7°C.

Conclusions:
The melting point of 2,4-Pentanedione, peroxide is 7°C.
Executive summary:

The melting/freezing point of 2,4-Pentanedione, peroxide, 30% in solvent mixturewas determined according toEC Regulation No 440/2008, Guideline A.1 and according to OECD Guideline 102 , andin accordance with European Chemicals Agency (ECHA), Guidance on information requirements and chemical safety assessment, Chapter R.7a, Endpoint specific guidance, May 2008 .

 

The melting point of the test substance is 7°C.


Description of key information

The melting point of 2,4-Pentanedione, peroxide is 7°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
7 °C

Additional information