Registration Dossier
Registration Dossier
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EC number: 223-888-3 | CAS number: 4109-96-0
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Vapour pressure (dichlorosilane): >100 000 Pa at 25°C
Vapour pressure (silanediol): <1E-06 Pa at 25°C (QSAR)
Vapour pressure (silicic acid): <1E-06 Pa at 25°C (QSAR)
Key value for chemical safety assessment
- Vapour pressure:
- 100 000 Pa
- at the temperature of:
- 25 °C
Additional information
Dichlorosilane is a gas at standard temperature and pressure, with a reported boiling point of 8°C. Therefore, the requirement to conduct a vapour pressure study is waived because the vapour pressure is expected to exceed the limit of measurement (i.e. 1E+05 Pa) at ambient temperature.
In contact with water, dichlorosilane hydrolyses very rapidly to form silanediol as an intermediate hydrolysis product. The ultimate hydrolysis product is silicic acid. The vapour pressure of both hydrolysis products has been determined to be <1E-06 Pa at 25°C using a validated QSAR estimation method. Although the model is not validated for inorganics, the result is indicative that the vapour pressure is negligible.
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