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EC number: 210-382-2 | CAS number: 614-45-9
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:
- october-november 2009
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other: Well conducted study, performed under the Internal Management system. Certificate of analysis present in the report.
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 102 (Melting point / Melting Range)
- Version / remarks:
- 1995
- Deviations:
- yes
- Remarks:
- see principles of method other than guideline
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.1 (Melting / Freezing Temperature)
- Version / remarks:
- 2008
- Deviations:
- no
- Qualifier:
- according to guideline
- Guideline:
- other: ASTM E537-07, Standard test method for the thermal stability of chemicals by Differential Scanning Calorimetry, 2007
- Deviations:
- no
- Principles of method if other than guideline:
- For glasstube method: Deviations from guideline (capillary method):
- The glass tube method uses a bigger glass tube than the capillary method (capillarymethod): 8 to 10 cm in length and 1.0 mm inner diameter)
- Heating in the glass tube method is done in small steps, whereas the capillary method uses a constant heating rate
- In the glass tube method liquid substances are first brought to the solid state, whereas the capillary method does not mention such procedure - GLP compliance:
- no
- Remarks:
- Internal Management system.
- Type of method:
- capillary method
- Remarks:
- After DSC
- Key result
- Melting / freezing pt.:
- > 9 - < 11 °C
- Conclusions:
- The melting range of tert-butyl peroxybenzoate is between 9°C and 11°C .
- Executive summary:
The melting point of tert-butyl perbenzoate was determined according toEC Regulation No 440/2008, Guideline A.1 and according to OECD Guideline 102 ,and in 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 was determined by using two methods, a thermal analysis method and a glass tube method (equivalent to the capillary method of the guidelines EC A.1 and OECD 102).
The melting range of tert-butyl peroxybenzoate is between 9°C (initial melting temperature) and 11°C (final melting temperature).
Reference
Accuracy check DSC
The measured values for Indium are mentioned below.
- onset temperature : 156.48°C
- enthalpy of melting : 28.55 J/g
The measured values are within the acceptance limits.
Test method 1: Thermal analysis method
The DSC curve of the measurement is shown in the attachment. No heat peak was measured. This means that the substance did not solidify or crystallize during the cooling step to -50°C (due to super cooling), and consequently did neither melt during the heating step back to 20°C. This means that the melting point could not be determined with this method. For that reason test method 2 was carried out with the substance as well.
Test method 2: Glass tube method
The glass tube with solid sample was moved to the continuously stirred liquid bath with isopropyl alcohol to determine the melting point. The start temperature was -10°C. The appearance of the sample at each check is mentioned below.
- at -10°C: sample is completely in the solid state
- at 0°C : sample is completely in the solid state
- at 4°C : sample is completely in the solid state
- at 6°C : sample is completely in the solid state
- at 7°C : sample is completely in the solid state
- at 8°C : sample is completely in the solid state
- at 9°C : beginning of melting
- at 10°C : sample is for 70% in the liquid state
- at 11°C : sample is completely in the liquid state
The test was repeated with the same results.
Description of key information
The melting range of tert-butyl peroxybenzoate is between 9°C and 11°C .
Key value for chemical safety assessment
- Melting / freezing point at 101 325 Pa:
- 9 °C
Additional information
This is supported by handbooks and literature.
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