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Physical & Chemical properties

Vapour pressure

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Description of key information

Vapour pressure [3-[tris(acetoxy)silyl]propyl methacrylate]: 0.009 Pa at 25°C (QSAR)


Vapour pressure [3-(trihydroxysilyl)propyl methacrylate]: 1.2E-5 Pa at 25°C (QSAR)


Vapour pressure [acetic acid]: 2090 Pa at 25°C (secondary literature)

Key value for chemical safety assessment

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

Additional information

A predicted vapour pressure value of 0.009 Pa at 25°C was obtained for the submission substance using a validated QSAR estimation method. This calculated value is based on the predicted boiling point of 320°C for the undecomposed form of the submission substance. Measurements have resulted in a measured boiling point of 215°C with indications of decomposition of the submission substance from about 128°C. Therefore, predicted vapour pressure value of 8.8 Pa at 25°C was obtained using measured boiling point of 215°C. Both predicted results are in the same fugacity band for worker exposure assessment. The result is considered to be reliable and is selected as key study.

In contact with water, the substance hydrolyses very rapidly forming 3-(trihydroxysilyl)propyl methacrylate and acetic acid. The silanol hydrolysis product, 3-(trihydroxysilyl)propyl methacrylate, has a predicted vapour pressure of 1.2E-5 Pa at 25°C using a validated QSAR estimation method.

A vapour pressure of 2090 Pa at 25°C was reported in secondary literature for acetic acid (Daubert and Danner, 1985).

Reference:

Daubert and Danner (1985). DaubertT E and Danner R P. Physical and Thermodynamic properties of Pure Chemicals. Data Compilation