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EC number: 297-566-6 | CAS number: 93642-68-3
Vapour pressure
Administrative data
Link to relevant study record(s)
Description of key information
Vapour pressure [3-[3-(triethoxysilyl)propyl]oxolane-2,5-dione]: 0.08 Pa at 20°C, 0.13 Pa at 25°C, 0.2 Pa at 30°C and 1.1 Pa at 50°C (measured)
Vapour pressure [2-[3-(triethoxysilyl)propyl]butanedioic acid]: 4.4E-05 Pa at 25°C (QSAR)
Vapour pressure [2-[3-(trihydroxysilyl)propyl]butanedioic acid]: <1.0E-06 Pa at 25°C (QSAR)
Vapour pressure [ethanol]: 7910 Pa at 25°C
Key value for chemical safety assessment
- Vapour pressure:
- 0.08 Pa
- at the temperature of:
- 20 °C
Additional information
Measured vapour pressure values of 0.08 Pa at 20°C, 0.13 Pa at 25°C, 0.2 Pa at 30°C and 1.1 Pa at 50°C were determined for the substance using the dynamic method in accordance with EU Method A.4. Although full details are not available, the results are considered to be reliable and are used for assessment purposes.
In contact with water, 3-[3-(triethoxysilyl)propyl]oxolane-2,5-dione hydrolyses very rapidly forming an intermediate ethoxysilane hydrolysis product, 2-[3-(triethoxysilyl)propyl]butanedioic acid. The ultimate silanol hydrolysis product is 2-[3-(trihydroxysilyl)propyl]butanedioic acid and ethanol. The vapour pressures of the intermediate ethoxysilane hydrolysis product, 2-[3-(triethoxysilyl)propyl]butanedioic acid and the ultimate silanol hydrolysis product, 2-[3-(trihydroxysilyl)propyl]butanedioic acid were determined to be 4.4E-05 Pa at 25°C and <1E-06 Pa at 25°C respectively using a validated QSAR estimation method.
Ethanol has a reported vapour pressure of 7910 Pa at 25°C (Daubert and Danner 1985).
Daubert, T E and Danner R P (1985).Physical and Thermodynamic properties of Pure Chemicals. Data Compilation
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