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Vapour pressure

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vapour pressure
Data waiving:
study technically not feasible
Justification for data waiving:
Justification for type of information:
Vapour Pressure was assessed in accordance with SOP115.00 Operation of Ebulliometer for Boiling Point and Vapour Pressure Determination of Liquids by Dynamic Method and in accordance with EU Guideline (A4(EC).

Approximately 20 mL of the Test Material was added to the ebulliometer, along with a magnetic stirrer bar and anti-bumping granules. The system was sealed with a glass blanking rod and heating at atmospheric pressure was commenced. Observations from the sample analysis are described below:

At atmospheric pressure the Test Item appearance was a clear amber liquid.

The pressure was gradually reduced; as pressure was reduced the temperature increased which is not the expected response and is indicative of the sample not boiling at atmospheric pressure. Between 1025 mBar and 20 mBar the temperature increased from 106.7 °C to 157.5 °C as the pressure was reduced.

Testing was stopped at this point as no true boil had been observed from the data collected in addition to no visible signs of boiling, i.e. bubbles.

Upon heating, the Test Item became opaque and the colour darkened to a brown/blank colour which is an indication of thermal degradation.

Therefore, determination of the vapour pressure for the highly viscous Test Material was “not technically feasible”.

Description of key information

Determination of the vapour pressure for the highly viscous Test Item was “not technically feasible”.

Key value for chemical safety assessment

Additional information