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Vapour pressure

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Description of key information

The vapour pressure of unrefined/acid treated oils is <0.0058 Pa.  

Key value for chemical safety assessment

Additional information

The vapour pressure for unrefined/acid treated oils was estimated to be <0.0058 Pa at 20°C (US EPA, 2000).


No additional measured vapour pressure data are available for unrefined/acid treated oils but measured data for other lubricant base oils (OLBOs) is available. Both OLBOs and unrefined/acid treated oils are produced by distilling crude oil but with marginally differing processes and have similar physico – chemical properties. The vapour pressure for a solvent dewaxed heavy paraffinic base oil (CAS No. 64742-65-0) was determined to be 0.00017 Pa using the EU A.4 test method (Hazleton Laboratories, 1991).