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Diss Factsheets

Physical & Chemical properties

Boiling point

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Administrative data

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2019
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling Point)
GLP compliance:
yes (incl. QA statement)
Type of method:
method according to Siwoloboff
Key result
Boiling pt.:
> 350 °C
Atm. press.:
1 013 hPa
Decomposition:
no

No boiling was observed in the preliminary test. Instead discolouration / decomposition of the test substance were observed (see table for details).









































TemperatureObservation
110°Cstart of experiment, heat rate 10°C/min
110-120°Cclear liquid, colourless
220-230°Cclear liquid, golden
240°Cclear liquid, cognac
250-260°Cclear liquid, brown
270°C

clear liquid, dark brown


280-290°Cclear liquid, black
300-350°Ccarbonisation, outgassing

Following the observations in the preliminary test a main test was not performed.


The atmospheric pressure at the time of the experiment was 97.37 kPa. As the discolouration was assigned to decomposition of the substance – a process independent from atmospheric pressure – a correction of the temperature to normalised pressure (101.325 kPa) was not made.

Conclusions:
No boiling was observed up to 350°C, temperature at which the test was
interrupted. However, beginning from -230°C darkening of the test substance was
observed, indicating possible decomposition of the test substance, or part of its
constituents. From ~300°C this decomposition became obvious, as the test substance
carbonised under outgassing.

Description of key information

No boiling was observed up to 350°C, temperature at which the test was interrupted. However, beginning from -230°C darkening of the test substance was observed, indicating possible decomposition of the test substance, or part of its
constituents. From ~300°C this decomposition became obvious, as the test substance carbonised under outgassing.

Key value for chemical safety assessment

Temperature of decomposition (state purity):
300 °C

Additional information

The atmospheric pressure at the time of the experiment was 97.37 kPa. As the discolouration was assigned to decomposition of the substance – a process independent from atmospheric pressure – a correction of the temperature to normalised pressure (101.325 kPa) was not made.