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Physical & Chemical properties

Vapour pressure

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vapour pressure
Type of information:
Adequacy of study:
key study
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: The result was obtained by an appropriate predictive method.
Justification for type of information:
QSAR prediction: migrated from IUCLID 5.6
Principles of method if other than guideline:
The result was obtained using an appropriate QSAR method (see attached QMRF and QPRF for details).
Test no.:
25 °C
Vapour pressure:
0.07 Pa
A vapour presssure of 0.07 Pa at 25°C was determined for the substance using an appropriate estimation method. The result is considered reliable.

Description of key information

Vapour pressure [[3-(2,3-epoxypropoxy)propyl]triethoxysilane]: 0.07 Pa at 25°C (QSAR)

Vapour pressure [2,3-dihydroxypropoxypropylsilanetriol] : 1.7E-07 Pa at 25°C (QSAR)

Vapour pressure [ethanol]: 7910 Pa at 25°C

Key value for chemical safety assessment

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

Additional information

A predicted vapour pressure of 0.07 Pa at 25°C was determined for the registered substance using a validated QSAR estimation method; the result is considered to be reliable and is selected as key study.


In contact with water, [3-(2,3-epoxypropoxy)propyl]triethoxysilane will hydrolyse at a moderately rapidly rate to form 2,3-dihydroxypropoxypropylsilanetriol and ethanol.


The vapour pressure of the silanol hydrolysis product, 2,3-dihydroxypropoxypropylsilanetriol was determined to be 1.7E-07 Pa at 25°C using a validated QSAR estimation method.


Ethanol has a reported vapour pressure of 7910 Pa at 25°C (Daubert, T E and Danner R P (1985))




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