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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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 [12,12-dimethyl-2,5,8,11,13,16,19,22-octaoxa-12-silatricosane]: 3.6E-05 Pa at 25°C (QSAR)
Vapour pressure [dimethylsilanediol]: 7 Pa at 25°C (QSAR)
Vapour pressure [2-[2-(2-methoxyethoxy)ethoxy]ethan-1-ol]: approximately 1 Pa at 20°C

Key value for chemical safety assessment

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

Additional information

A predicted vapour pressure value of 3.6E-05 Pa at 25°C was determined for the substance using a validated QSAR estimation method. The result is considered to be reliable.

In a secondary source to which reliability could not be assigned (MSDS), a vapour pressure value of <10 Pa at 20°C was reported for the substance.

In contact with water, the substance hydrolyses moderately rapidly to form dimethylsilanediol and 2-[2-(2-methoxyethoxy)ethoxy]ethan-1-ol. The vapour pressure of the silanol hydrolysis product, dimethylsilanediol is predicted to be 7 Pa at 25°C.

On the ECHA disseminated dossier webpage, the non-silanol hydrolysis product, 2-[2-(2-methoxyethoxy)ethoxy]ethan-1-ol (triethylene glycol, CAS 112-35-6) has a reported vapour pressure of approximately 1 Pa at 20°C.