Registration Dossier

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

The vapour pressure of the substance could not be conducted as the substance decompose during measurement.

The vapour pressure of the substance was calculated to be 0.00000000561 hPa at 25 °C

Key value for chemical safety assessment

Vapour pressure:
0 hPa
at the temperature of:
25 °C

Additional information

The study does not need to be conducted as the substance decompose during measurement.

Thus the experimental determination was replaced by an appropriate calculation method. In addition two studies using the gas suturation method and the static method were performed.

The vapour pressure of the test substance was estimated using EPISUITE v 4.10. The vapour pressure of the test substance was calculated based on the estimated vapour pressures of its constituents. Modified Grain method at 25°C was used for estimations. Based on the estimations, the vapour pressure of the test substance was calculated to be 0.00000000561 hPa at 25°C.

The vapour pressure was also conducted according to the gas satutation method where a vapour pressue of 0.0007 hPa at 50 °C was measured. As can be seen from the measurement results, the vapor pressure decreases with increasing measurement time.This is due to levels of volatile components (e.g., moisture) that are preferentially discharged. For more accurate vapor pressure measurements would be required at higher temperatures.This was not possible due to thermal changes (polymerization) of the samples.The indicated vapor pressures are therefore subject to a high measurement uncertainty.

As the substance is an UVCB another vapour pressure study was conducted in accordance with the OECD Guideline for the Testing of Chemicals 104: "Vapour pressure" using the static method, to avoid segregation of components during the measurement and to get the vapour pressure of the substance as it is. The GLP study determined the vapour pressure to be 5.9 hPa at 20 °C, 7.6 hPa at 25 °C and 23.6 hPa at 50 °C.

To describe the vapour pressure of the pure substance the calculated value was chosen as key value.