This International Standard specifies methods of analysis of technical sodium alkylsulphates. It covers the following determinations : — Measurement of pH. — Determination of water content. — Determination of free alkalinity or free acidity. — Determination of total alkalinity. — Determination of matter extractable by light petroleum. — Determination of the sodium alkylsulphates content. — Determination of sodium sulphate content. — Determination of sodium chloride content. It also sets out, in an annex, a general scheme of analysis.