ÖNORM EN 12634

This European Standard specifies a method for detemiination of acid number by potentiometric 1 titration, of lubricating oils and additives soluble in mixtures of propan-2-01, dimethylsulfoxide and ~ toluene. It is applicable in the range 0,l mg KOWg to 250 mg KOWg, and to unused and used ~ lubricating oils and additives. I In the case of engine oils, used engine oils and oils with a high polymer content, e.g. viscosity I index improvers, precision will be poor as the electrode perforrnance will be impaired, and the application of this method is not recornmended. Precision data are only valid for industrial oils and j related products. NOTE : No direct conclusions can be drawn from the content of the acidic constituents bn the suitability of lubricants for specific applications, and it is not possible to rate comparatively the quality of lubricants and additives on the basis of the quantity of acidic components. WARNING. The use of this standard rnay involve hazardous materials, operations and equipment. This standard does not purport to address ail of the safety problems associated with its use. It is the responsibility of the User of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.