This standard deals with the determination of the aromatic hydrocarbon content of new mineral insulating oils. Two methods are proposed: — Infrared spectrophotometric analysis This method is recommended as a quality control and acceptance test for mineral insulating oils. It uses the relationship between the absorbance at 1 610 cm- 1 and the n-d-M analysis * to determine the proportion of the total carbon atoms present in aromatic ring structures. The conversion factor derived from this relationship is applicable to oils with a molecular mass in the range 290 to 500 and with an aromatic carbon content in the range 1.2 % to 60%. — Adsorption chromatographic analysis This method describes the measurement of the percentage by mass of polar compounds and compounds containing at least one aromatic ring per molecule present in low molecular mass mineral insulating oils.