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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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: 479 Pa at 20°C (2,4,6,8-tetramethylcyclotetrasiloxane)
Vapour pressure: 0.05 Pa at 20°C (methylsilanetriol)

Key value for chemical safety assessment

Vapour pressure:
479 Pa
at the temperature of:
20 °C

Additional information

An appropriate and validated QSAR model has been applied. A value of 479 Pa has been predicted at 20°C, this result is considered reliable and has been chosen as the key study. One measured value is available, from a study to which reliability could not be assigned, of 7.02 mm Hg at 20°C (930 Pa). This value is in satisfactory agreement with the key value.

The vapour pressure of the final hydrolysis product methylsilanetriol has been calculated using the same QSAR method.