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Physical & Chemical properties

Vapour pressure

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Reference
Endpoint:
vapour pressure
Type of information:
calculation (if not (Q)SAR)
Adequacy of study:
key study
Study period:
30 July 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: calculation
Principles of method if other than guideline:
Modified Grain Method
GLP compliance:
no
Type of method:
other: calculation using EPIsuite
Test no.:
#1
Temp.:
ca. 25 °C
Vapour pressure:
0 Pa

Calculated using EPIsuite (Modified Grain Method):

Consistent

Calculation vapour pressure

C18 oxirane 2-ethylhexyl ester (C18:1)

5.93 µPa

C18 dioxirane 2-ethylhexyl ester (C18:2)

1.99 µPa

C18 trioxirane 2-ethylhexyl ester (C18:3)

0.809 µPa

C20 oxirane 2 -ethylhexyl ester (C20:1)

1.2 µPa

C12 oxirane 2-ethylhexyl ester (C12:1)

1.14 mPa

C22 oxirane 2-ethylhexyl ester (C22:1)

0.202 µPa

Conclusions:
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 said mixture.

Consequently the vapour pressure has been estimated by calculation instead using EPIsuite (Modified Grain Method). Using Raoults Law (P (Total Pressure) = ΣI xI VPI) and the calculated vapour pressures of all known components, the vapour pressure of the epoxidised fatty acids was determined to be 0.0676 mPa 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 said mixture.

Consequently the vapour pressure has been estimated by calculation instead using EPIsuite (Modified Grain Method). Using Raoults Law (P (Total Pressure) = ΣI XI VPI) and the calculated vapour pressures of all known components, the vapour pressure of the epoxidised fatty acids was determined to be 0.0676 mPa 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 said mixture. Consequently the vapour pressure has been estimated by calculation instead using EPIsuite (Modified Grain Method).Using Raoults Law (P (Total Pressure) = ΣI xI VPI) and the calculated vapour pressures of all known components, the vapour pressure of the epoxidised fatty acids was calculated as 0.0676 mPa at 25 ºC.

Key value for chemical safety assessment

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

Additional information