This International Standard describes a procedure for the determination of the mass percentage of sulfated ash from unused lubricating oils containing additives and from additive concentrates used in compounding.These additives usually contain one or more of the following metals: barium, calcium, magnesium, zinc, potassium, sodium and tin. The elements sulfur, phosphorus and chlorine can also be present in combined form.NOTE 1 For the purposes of this International Standard, the terms ‘%(m/m) and ‘%(V/V)’ are used to represent the mass and volume fractions of a material respectively.Application of this procedure to sulfated ash levels below 0,02 % (m/m) is