The purpose of this standard is to specify a method for the determination of the content of insulfated matter in ordinary commercial products obtained by neutralization of the sulfuric esters of alcohols and ethoxylated alkylphenols, which do not contain an average of more than 20 ethylene oxide groups. per molecule. These products are also called ethoxylated alcohol sulfates (alkyl oxyethylene sulfates) and ethoxylated alkylphenol sulfates (alkyl oxyethylene sulfates). Insulfated matter is defined as "sulfatable substance that has escaped the sulfation reaction and/or has been transformed into a non-sulfatable product in the course of said reaction" (see standard UNE 55-514).