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Diss Factsheets

Physical & Chemical properties

Boiling point

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boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
according to guideline
EU Method A.2 (Boiling Temperature)
according to guideline
OECD Guideline 103 (Boiling point/boiling range)
GLP compliance:
Type of method:
differential scanning calorimetry
Decomp. temp.:
>= 164 °C
Remarks on result:
other: not possess a boiling temperature but undergoes chemical change from 164°C.

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.

PBO does not possess a boiling temperature but undergoes chemical change from 164°C.

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.