The process described in this standard is used for the gas chromatographic determination of the degree of purity of the following ketones according to DIN 53247 part 1 which are used as solvents and thinners in paints, varnishes and similar coating materials: acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, diacetone alcohol, diisobutyl ketone, isophorone.#,,#