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Vapour pressure

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Description of key information

Vapour pressure (2,2,4,4,6,6-hexamethylcyclotrisilazane): 35 Pa at 25°C (QSAR)

Vapour pressure (dimethylsilanediol): 7 Pa at 25°C (QSAR)

Vapour pressure (ammonia): 861100 Pa at 20°C

Key value for chemical safety assessment

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

Additional information

A predicted vapour pressure value of 35 Pa at 25°C was determined for the substance using a validated QSAR estimation method. The result is considered to be reliable.

In contact with water, 2,2,4,4,6,6-hexamethylcyclotrisilazane reacts very rapidly to produce dimethylsilanediol and ammonia/ammonium as products of hydrolysis. The vapour pressure of the silanol hydrolysis product, dimethylsilanediol is predicted to be 7 Pa at 25°C using a validated QSAR estimation method.

Ammonia has a reported vapour pressure of 861100 Pa at 20°C (OECD 2007).


OECD (2007). SIDS Initial Assessment Report for SIAM 24, Paris, France, 17-20 April 2007, Ammonia Category.