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EC number: 294-436-0 | CAS number: 91722-33-7 A complex combination of organic compounds separated after condensation of the vapors from the destructive distillation of wood.
Boiling point
Administrative data
Link to relevant study record(s)
Description of key information
Two experiments were conducted using the dynamic method.
No boiling point could be determined because decomposition of the test item taking place
at sample temperatures of approx. 190 to 194 °C.
Decomposition was indicated by formation of a slightly yellowish condensate at these temperatures,
while the temperature measured at the pumping Cottrell pump was 171.3 resp.
175.3 °C.
Key value for chemical safety assessment
Additional information
This study was performed in order to determine the boiling point of Tar wood. The boiling
point is one of the fundamental physico-chemical properties of a chemical substance. The
test item was heated until boiling/decomposition of the test item could be observed. All
observations (e.g. changes of the physical state) were documented as well.
No boiling point of the test item Tar wood could be determined using the dynamic method.
As the colour of the test item was too dark, the Siwoloboff method was not applicable.
Boiling was observed, indicated by pumping of the Cottrell pump, but the thermometer in
the Cottrell pump showed a much lower temperature than the temperature of the sample.
If a liquid boils, the measured temperatures of the thermometers should be similar. Therefore,
the temperature difference between the thermometers is a sign of decomposition.
The observed slightly yellowish condensate in the cooler during heating and the different
odour are additional signs of decomposition of the test item.
Therefore, no boiling point of the test item Tar wood could be determined because of decomposition
of the test item at approx. 171 to 175 °C.
No observations were made which might cause doubts on the validity of the study outcome.
Therefore, the result of the study is considered valid.
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