Registration Dossier
Registration Dossier
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EC number: 237-041-0 | CAS number: 13596-23-1
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Vapour pressure [Octachlorotrisilane]: 9.4 Pa at 25°C (QSAR)
Vapour pressure [Octahydroxytrisilane]: <1E-06 Pa at 25 °C (QSAR)
Vapour pressure [Monosilicic Acid]: <1E-06 Pa at 25 °C (QSAR)
Key value for chemical safety assessment
- Vapour pressure:
- 9.4 Pa
- at the temperature of:
- 25 °C
Additional information
A measured vapour pressure of 2 hPa at 20°C was determined for the substance using the static method. However, the method used is susceptible to the presence of volatile impurities in the sample which are not properly degassed prior to the measurement. The study report lacks detailed information on the purity, physical state or batch number of the substance and the sample handling during the study. The study report also indicates that decomposition was observed during the vapour pressure study from about 100°C. The measured value of 2 hPa is therefore considered high for the substance and is disregarded. A predicted vapour pressure of 9.4 Pa at 25°C was determined for the test substance using an estimation method; the result is considered to be reliable and selected as key study. The QSAR value has been validated using reliable measurements for structural analogues reflecting the main constituent.
The vapour pressure has been obtained for the hydrolysis products using an appropriate calculation method:
Vapour pressure [Octahydroxytrisilane]: <1E-06 Pa at 25°C (Test method/QSAR) - Hydrolysis Product
Vapour pressure [Monosilicic Acid]: <1E-06 Pa at 25°C (Test method/QSAR) - Hydrolysis Product
The method has not been validated for inorganic substances but gives an indication of very low vapour pressure. Neither product has been isolated and the predicted values are included for completeness only.
The substance and hydrolysis products have very low vapour pressures so are not considered volatile.
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