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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure (tetrapropyl orthosilicate): 0.26 Pa at 25°C  (QSAR)
Vapour pressure (Silicic acid): <1E-06 Pa at 25°C (QSAR)

Key value for chemical safety assessment

Vapour pressure:
0.26 Pa
at the temperature of:
25 °C

Additional information

A predicted vapour pressure of 0.26 Pa at 25°C was determined for the test substance using an appropriate QSAR estimation method. The result is considered reliable. The hydrolysis product, silicic acid has a negligible estimated vapour pressure of <1E-06 Pa at 25°C.

A measured vapour pressure of 1940 Pa at 20°C is available for the non-Si hydrolysis product, propanol (Hiaki et al 1994)