Registration Dossier
Registration Dossier
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EC number: 200-076-7 | CAS number: 51-03-6
Boiling point
Administrative data
Link to relevant study record(s)
- Endpoint:
- boiling point
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- 2000
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- according to guideline
- Guideline:
- EU Method A.2 (Boiling Temperature)
- Qualifier:
- according to guideline
- Guideline:
- OECD Guideline 103 (Boiling point/boiling range)
- GLP compliance:
- yes
- Type of method:
- differential scanning calorimetry
- Decomposition:
- yes
- Decomp. temp.:
- >= 164 °C
- Remarks on result:
- other: not possess a boiling temperature but undergoes chemical change from 164°C.
- Conclusions:
- PBO does not possess a boiling temperature but undergoes chemical change from 164°C.
Reference
A fresh sample was scanned between 150 and 210°C. On inspection of the sample at room temperature, it was seen to be an amber coloured liquid, thus indicating that the first exotherm was a result of some chemical change.
An additional scan was performed between 100 and 300°C to enable measurement of the onset temperatures. Upon cooling the sample to room temperature, it was seen to be a deep amber-coloured liquid. The onset of chemical change occurred at 164°C, with the extrapolated onset temperature being 176°C.
When a fresh sample was scanned under an atmosphere of nitrogen, no exotherms were produced. This indicated that oxidative degradation processes were occuring.
Description of key information
PBO does not possess a boiling temperature at 101 325 Pa, but it undergoes chemical change from 164°C (EU Method A.2 (Boiling Temperature); EOECD Guideline 103 (Boiling point/boiling range)
Key value for chemical safety assessment
- Boiling point at 101 325 Pa:
- 164 °C
Additional information
The boiling temperature was assessed using differential scanning calorimetry, is a technique that records the difference in energy inputs into a substance and a reference material, as a function of temperature (°C), while the substance and reference material are maintained at identical temperatures.
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