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Physical & Chemical properties

Vapour pressure

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Description of key information

=< 6.77 Pa at 20 °C

Key value for chemical safety assessment

Vapour pressure:
6.77 Pa
at the temperature of:
20 °C

Additional information

The vapour pressure of the substance was determined with the use of Modified Grain-Watson estimation (MPBPWIN v1.43, Estimation Programs Interface Suite™ for Microsoft® Windows v4.10). The experimental study according to EU Method A.4 (static method) was devalidated because of too high water content, disturbing the measurements.

The calculation is based on the lowest possible boiling temperature, which in fact is probably a decomposition temperature. In a peer reviewed SIDS Initial Assessment Profile for alkyl sulphates (structurally related to alcohols ethoxylated, sulphated; SIAM 25, 17 -18 October, 2007) it is stated that: "As ionic substances, all members of this category have extremely low vapour pressures. Calculated values are in the ranges 1E-11 hPa to 1E-15 hPa (C8 -18 alkyl sulphates) (...) Therefore, they decompose before reaching their theoretical boiling points". Thus, the obtained value should be considered an upper limit of the vapour pressure and accepted for the risk assessment calculations in the sense of a "worst-case scenario".