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Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure [tris(isopropenyloxy)(vinyl)silane]: 5.3 Pa at 25°C (QSAR)
Vapour pressure (vinylsilanetriol): 0.017 Pa at 25°C (QSAR)
Vapour pressure (acetone) = approximately 24300 Pa at 20°C, 53330 Pa at 39.5°C

Key value for chemical safety assessment

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

Additional information

A predicted vapour pressure of 5.3 Pa at 25°C was obtained for the submission substance using a validated QSAR estimation method. The result is considered to be reliable.

In contact with water, the submission substance hydrolyses rapidly to form vinylsilanetriol and propen-2-ol. The vapour pressure of the silanol hydrolysis product, vinylsilanetriol is predicted to be 0.017 Pa at 25°C using a validated QSAR estimation method.

The hydrolysis of [tris(isopropenyloxy)(vinyl)silane] produces vinylsilanetriol and 3 molecules of propen-2-ol. Propen-2-ol is an enol type structure, which is in equilibrium with its keto tautomer, propanone (commonly called acetone). The equilibrium heavily favours the keto form at room temperature. Therefore, the properties of acetone as well as vinylsilanetriol are considered for the chemical safety assessment. Acetone has reported vapour pressure values of approximately 24300 Pa at 20°C and 53330 Pa at 39.5°C (OECD 1999).

References:

OECD (1999): SIDS Initial Assessment Report (SIAR) for the 9th SIAM, Paris, France, 29 -30 June 1999, Acetone, CAS 67-64-1.