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Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
experimental study
Adequacy of study:
key study
Study period:
5 August 2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
according to
Guideline:
other: Modified Grain Method
Principles of method if other than guideline:
Calculated using EPIsuite (Modified Grain Method).
GLP compliance:
no
Type of method:
other: Calculated value using EPIsuite
Key result
Temp.:
25 °C
Vapour pressure:
< 0 Pa

For the 3 main components of V3000 (comprising >50% of V3000), the vapour pressure has been calculated to be:

C18:1 2-ethyl hexyl ester 1.99x10-5 Pa at 25 ºC

C18:2 2-ethyl hexyl ester 1.69x10-5 Pa at 25ºC

C18:3 2-ethyl hexyl ester 1.43x10-5 Pa at 25 oC

Using Raoults Law (P (Total Pressure) = ΣI xI VPI), the vapour pressure of V3000 was calculated to be <2.5x10-4 Pa at 25 ºC.

Conclusions:
The vapour pressure of V3000 was calculated to be <2.5 x10-4 Pa at 25 ºC.
Executive summary:

It is not possible to correctly and reliably measure the vapour pressure of a UVCB – if a study were run to measure the vapour pressure of the UVCB, the study would result in the determination of the vapour pressure of most volatile substance(s) of the mixture. Consequently the vapour pressure has been estimated by calculation using EPIsuite (Modified Grain Method). For the 3 main components of V3000 (comprising >50%), the vapour pressure has been calculated to be:

C18:1 2-ethyl hexyl ester 1.99x10-5 Pa at 25 ºC

C18:2 2-ethyl hexyl ester 1.69x10-5 Pa at 25 ºC

C18:3 2-ethyl hexyl ester 1.43x10-5 Pa at 25 ºC

Using Raoults Law, the vapour pressure of V3000 was calculated to be <2.5x10-4 Pa at 25 ºC

Description of key information

It is not possible to correctly and reliably measure the vapour pressure of a UVCB – if a study were run to measure the vapour pressure of the UVCB, the study would result in the determination of the vapour pressure of most volatile substance(s) of the mixture. Consequently the vapour pressure has been estimated by calculation using EPIsuite (Modified Grain Method). For the 3 main components of V3000 (comprising >50%), the vapour pressure has been calculated to be:

C18:1 2-ethyl hexyl ester 1.99x10-5 Pa at 25 ºC

C18:2 2-ethyl hexyl ester 1.69x10-5 Pa at 25 ºC

C18:3 2-ethyl hexyl ester 1.43x10-5 Pa at 25 ºC

Using Raoults Law, the vapour pressure of V3000 was calculated to be <2.5x10-4 Pa at 25 ºC

Key value for chemical safety assessment

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

Additional information