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EC number: 275-062-7 | CAS number: 70955-71-4
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Due to the complex nature of the test item (UVCB), estimation of the vapour pressure was performed using QSAR. These estimations were done according to REACH guidance on QSARs R.6 May/July 2008.
Depending of the estimation programs used, the vapour pressure of the test item was considered to be ≤0,004 Pa at 20°C . Then, test item is then considered as non volatile.
Key value for chemical safety assessment
- Vapour pressure:
- 0.004 Pa
- at the temperature of:
- 20 °C
Additional information
Due to the complex nature of the test item, predictions were investigated regarding the vapour pressure. The experimental determination of this parameter will be very difficult and probably not possible to perform. Indeed, the methods described in recognized international guidelines are relevant for pure substance.
The OECD guidelines N°104 specifies:
- “In general, the vapour pressure is determined at various temperatures. In a limited temperature range, the logarithm of the vapour pressure of a pure substance is a linear function of the inverse of the thermodynamic temperature according to the simplified Clapeyron-Clausius equation.” Furthermore, experimental determination shows that the methods described in the OECD 104 are not relevant for complexes substances, such as UVCB. Indeed, the results obtained are not interpretable.
The main representative isomers have been chosen to perform QSAR predictions. The validities of the programs used for the estimation regarding the chosen isomers have been verified.
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