The ISO 457 standard, developed by the International Standards Organization (ISO), applies to soaps with a chloride content equal to or greater than 0,1% (m/m), expressed as sodium chloride. Not applicable to compounded products. After separation of a test and separation of fatty acids by filtration, determination by aggregenometric titration is performed.
It is an important principle to determine the chloride content by argentimetric titration after disintegration of a test section and separation of fatty acids by filtration.
Only reagents of accepted analytical reagent quality and only distilled water or water of at least equivalent purity should be used during analysis.
The difference between results obtained in two different laboratories on the same sample should not differ by more than 0,05% from the value of the percent by mass of chlorides found, expressed as sodium chloride or potassium chloride.
Conventionally, free caustic alkali is expressed as sodium hydroxide (NaOH) for sodium soaps and potassium hydroxide (KOH) for potassium soaps.
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