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Boiling point

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Reference
Endpoint:
boiling point
Type of information:
experimental study
Adequacy of study:
key study
Study period:
1985
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
Guideline:
OECD Guideline 103 (Boiling point/boiling range)
GLP compliance:
yes
Type of method:
method according to Siwoloboff
Key result
Decomposition:
yes
Decomp. temp.:
> 220 - < 250 °C
Boiling pt.:
109 °C
Atm. press.:
11 Pa
Remarks on result:
other: Heat of evaporation= 82.9kJ/mol, measured by Thermogravimetry
Boiling pt.:
314.85 °C
Atm. press.:
1 013 hPa
Remarks on result:
other: Extrapolated using measured data by Thermogravimetry

The determination of boiling point according to Siwoloboff was impossible, because of decomposition of the substance in the temperature region 220 - 250°C.

Observation during the determination:

1) Temperature region 25 - 242°C with heating rate ca. 17 K/min: change of color at about 220°C (colorless to yellow)

2) Temperature region 242 - 248°C with heating rate 0.5 K/min: substance has brown color and is turbid

3) Temperature region 248 - 250°C with heating rate 0.5 K/min: beginning of separation of brown, dark drops in the liquid

Evolution of gas can be seen in the temperature region above 242°C.

Conclusions:
The test substance decomposes at >220°C before boiling

Description of key information

Decomposed at >220°C before boiling

Extrapolated 315°C at 1013 hPa for use in CSA

Key value for chemical safety assessment

Boiling point at 101 325 Pa:
314.85 °C
Temperature of decomposition (state purity):
220 °C

Additional information

The determination of boiling point according to Siwoloboff was not possible because of decomposition of the substance in the temperature region 220 - 250°C.

The boiling point was extrapolated using vapour pressure data measured by Thermogravimetry