ISO 4318:1989 Preview
Surface active agents and soaps -- Determination of water content -- Azeotropic distillation method
This standard was last reviewed and confirmed in 2013. Therefore this version remains current.
The water in a test portion is removed by azeotropic destillation with boiling xylene or petroleum. The volume of the water collected is measured. The method is applicable to products in the form of powders having water contents greater than 5 % (m/m), and in the form of pastes ans solutions. It is not applicable to samples containing water-soluble volatile compounds, for example ethanol.
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