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Physical & Chemical properties

Vapour pressure

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Description of key information

342 Pa
Value used for CSA: 1.87E-04 Pa (oleic acid)

Key value for chemical safety assessment

Additional information

The vapour pressure for the physical-chemical properties endpoint was calculated using the value from the boiling point measurement, as described in OECD Test Guideline 104.  Decomposition was noted in the boiling point experiment so this is not a true boiling point.  Further, the boiling point and vapour pressure are both representative of the most volatile component in the substance as tested, which is probably water (accounting for at least 1% of the total weight) or other minor water-soluble minor constituents.  For the purposes of risk assessment, the more appropriate value for vapour pressure is the most volatile major constituent of the substance, which is oleic acid (a free fatty acid). The vapour pressure of oleic acid is 1.87E-04 Pa (obtained from the Experimental database of MPVPBPWIN v. 1.43).