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Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure [ tri(isopropyl)silyl acrylate]: 10 Pa at 25°C (QSAR)

Vapour pressure [tris(1-methylethyl)silanol]: 4 Pa at 25°C (QSAR)

Vapour pressure [acrylic acid]: 380 Pa at 20°C

Key value for chemical safety assessment

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

Additional information

There are two reliable values for the vapour pressure of the substance. A measured vapour pressure of 4.4 Pa at 25°C was obtained for the submission substance using the dynamic method in accordance with OECD 104 test guideline and in compliance with GLP. Also, a predicted vapour pressure of 10 Pa at 25°C was obtained for the substance using a validated QSAR estimation method. The predicted value was selected as key study because the measured data were made at significantly elevated temperature (120-164°C) and so the uncertainty on the extrapolated vapour pressure to ambient temperature is relatively high. Similarly, a value of 22 Pa was available on the ECHA website.

In contact with water, the substance hydrolyses very rapidly to form tris(1-methylethyl)silanol and acrylic acid. The silanol hydrolysis product; tris(1-methylethyl)silanol has a predicted vapour pressure of 4 Pa at 25°C using a validated QSAR estimation method.

Vapour pressure of 380 Pa at 20°C was reported for acrylic acid (ECB 2002).

Reference:

ECB (2002). European Union Risk Assessment Report acrylic acid CAS No: 79-10-7 EINECS No: 201-177-9 Risk Assessment, PL-1 Vol 28, 2002.