3-(triethoxysilyl)propiononitrile

Vapour pressure

Link to relevant study record(s)

Reference

Endpoint:

vapour pressure

Type of information:

other: Collection of data

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

data from handbook or collection of data

Principles of method if other than guideline:

The vapour pressure of 3-(triethoxysilyl)propiononitrile at 20ºC was calculated from a  temperature-vapour pressure correlation that was developed by the AIChE DIPPR® using peer-reviewed experimental data measured at temperatures ranging from 0 to 93ºC. Original test procedures and conditions used to measure the vapour pressures were not identified in the AIChE DIPPR  Project 801® Database.

GLP compliance:

not specified

Type of method:

other: calculated from a  temperature-vapour pressure correlation

Key result

Test no.:

#1

Temp.:

20 °C

Vapour pressure:

1.9 Pa

Conclusions:

A vapour pressure of 1.9 Pa at 20°C was reported for the substance in a collection of reliable data which has been subject to peer-review and in which the original data sources are traceable. The result is considered to be reliable.

Description of key information

Vapour pressure [3-(triethoxysilyl)propiononitrile]: 1.9 Pa at 20°C (calculated)

Vapour pressure [3-(trihydroxysilyl)propiononitrile]: 6.7E-05 Pa at 25°C (QSAR)

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

Key value for chemical safety assessment

Vapour pressure:

1.9 Pa

at the temperature of:

20 °C

Additional information

A vapour pressure of 1.9 Pa at 20°C was calculated for the substance from a temperature-vapour pressure correlation using a peer-reviewed data at a temperature range of 0-93°C (DIPPR 2006). The result is considered to be reliable and is selected as key study.

In addition, vapour pressure values of 1900 Pa at 20°C and 2200 Pa at 25°C were obtained for the substance using an isoteniscope method (Chilworth 2005). However, these results were disregarded because during the experiment, the test samples were not completely degassed and as a result the measured vapour pressures are considered not reliable. The purity of the test sample was stated as 98%. Presence of volatile impurities such as ethanol in a sample will significantly increase the vapour pressure of the substance.

 

In a secondary source to which reliability could not be assigned, vapour pressure of <133 Pa at 20°C was reported for the substance.

 

In contact with water, the substance hydrolyses to form 3-(trihydroxysilyl)propiononitrile and ethanol.

A vapour pressure of 6.7E-05 Pa at 25°C was determined for the hydrolysis product using a relevant QSAR estimation method.

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

 

Reference:

 

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