Registration Dossier

Data platform availability banner - registered substances factsheets

Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Vapour pressure

Currently viewing:

Administrative data

Link to relevant study record(s)

Referenceopen allclose all

Endpoint:
vapour pressure
Type of information:
(Q)SAR
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification
Remarks:
Vapour pressure was estimated using the validated EPISuite modelling tool (US EPA).
Justification for type of information:
QSAR prediction
Principles of method if other than guideline:
Vapour pressure was estimated using the validated EPISuite modelling tool (US EPA)
GLP compliance:
no
Remarks:
not applicable

To gain an understanding of vapour pressure characteristics of naphthenic acids, various hydrocarbon acidic structures to predominate in naphthenic acids in extracts of oil sands tailings (Rogers et al, 2002) were estimated for vapour pressure at 25°C using the EPISuite computer model (US EPA, 2009)

Estimated vapour pressures for various naphthenic acid compounds:

Naphthenic Acid Carbon Molecular Vapour
Type Number Weight Pressure, Pa
1 -ring cyclopentane  16  254  9.5x10^-4
1 -ring cyclohexane  21  325  0.15x10^-4 
2 -ring cyclopentane  17  266  4.8x10^-4 
2 -ring cyclohexane  21  323  0.15x10^-4 
3 -ring cyclohexane  17  264  4.4x10^-4 
3 -ring cyclohexane  21  321  0.15x10^-4
4 -ring cyclohexane  17  262  4.4x10^-4 
 4 -ring cyclohexane

 21

 319  0.17x10^-4
Conclusions:
To gain an understanding of vapour pressure characteristics of naphthenic acids, various hydrocarbon acidic structures to predominate in naphthenic acids were estimated for vapour pressure using the EPISuite computer model (US EPA, 2009). Values obtained ranged from 0.15 x 10 E-4 to 9.5 x 10 E-4 Pa at 25°C. The vapour pressure of Naphthenic acids can be concluded to be < 0.001 Pa at 25°C.
Endpoint:
vapour pressure
Data waiving:
study technically not feasible
Justification for data waiving:
other:
Reason / purpose for cross-reference:
data waiving: supporting information

Description of key information

Various hydrocarbon acidic structures predominant in naphthenic acids were estimated for vapour pressure using the EPISuite computer model (US EPA, 2009).

Key value for chemical safety assessment

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

Additional information

Values obtained ranged from 0.15 x 10 E-4 to 9.5 x 10 E-4 Pa at 25°C. The vapour pressure of Naphthenic acids can be concluded to be < 0.001 Pa at 25°C.