This standard specifies a method for determining the water content of surfactants and soaps, by azeotropic drag. Volatile matters soluble in water and insoluble in xylene or petroleum will be included in the result. The method is applicable to powder products whose water content is greater than 5% by weight, as well as to paste or solution products. It is not applicable to samples containing volatile water-soluble compounds (e.g. ethanol). Regarding soaps, since the results cannot be obtained with a precision greater than 0.3%, this method should only be applied to soaps that contain appreciable quantities of volatile matters insoluble in water. It is also recommended to apply this method for soaps prepared with linseed oil or other drying oils, as well as for soaps containing, for example, sodium silicate. The azeotropic drag method is only applicable when indicated in the specific standard for a certain product.