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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:
November 11, 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Well conducted study under internal management system, according to EC and OECD guidelines, certificate of analysis in the report.
Qualifier:
according to
Guideline:
EU Method A.1 (Melting / Freezing Temperature)
Deviations:
yes
Remarks:
see below
Qualifier:
according to
Guideline:
OECD Guideline 102 (Melting point / Melting Range)
Deviations:
yes
Remarks:
see below
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)
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 a liquid below 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 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
Remarks:
Internal management system
Type of method:
capillary method
Melting / freezing pt.:
8 °C
Atm. press.:
ca. 1 atm

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

 

1stmeasurement

at -25°C  : completely solid (white)

at 2°C    : 5-10% liquid

at 7°C    : approximately 15 % liquid

at 8°C    : completely liquid

 

2ndmeasurement

at -5°C   : completely solid (white)

at 7°C    : approximately 10 % liquid

at 8°C    : completely liquid

Conclusions:
The melting point of di-tert-butyl 1,1,4,4-tetramethylene diperoxide is 8°C.

Description of key information

The melting point of di-tert-butyl 1,1,4,4-tetramethylene diperoxide is 8°C.

Key value for chemical safety assessment

Melting / freezing point at 101 325 Pa:
8 °C

Additional information

Supported by:

78-63-7, freezing point, Kirk-Otmer, 2001, SS (melting point 8°C)

78-63-7, melting range, Hogt, 1994, SS(melting range is 3-9 °C).