Registration Dossier
Registration Dossier
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EC number: 201-128-1 | CAS number: 78-63-7
Melting point / freezing point
Administrative data
Link to relevant study record(s)
- 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
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Deviations:
- yes
- Remarks:
- see below
- Qualifier:
- according to guideline
- 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
- Conclusions:
- The melting point of di-tert-butyl 1,1,4,4-tetramethylene diperoxide is 8°C.
Reference
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
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).
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