ISO 2131:1972 Preview
Surface active agents -- Simplified classification
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
The simplified system enables the characteristics of the substances to be expressed by an abbreviated lettering and numbering system, consisting of one letter and four figures (five in the case of compounds comprising several hydrphilic groups). The letter designates the ionic character and figures correspond to the functional groups present in the molecule.
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