scope:

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. Application of this procedure to sulfated ash levels below 0,02 % (m/m) is restricted to oils containing ashless additives. The lower limit of applicability of the procedure is 0,005 % (m/m) sulfated ash.