EUROLAB laboratory provides testing and compliance services within the scope of EN 12634 standard. The EN 12634 standard specifies a method for determining the acid number by potentiometric titration of lubricating oils and additives dissolved in mixtures of propan-2-ol, dimethylsulfoxide and toluene. It can be applied to unused and used lubricating oils and additives in the range of 0,1 mg KOH/g to 250 mg KOH/g.
The Acid Number (AN) indicates the amount of potassium hydroxide required to neutralize the acids present in one gram of oil. If the sample is too dark to determine the neutralization number where an indicator will indicate neutral status by a color change when added to a mixture of oil and solvent, AN should be determined for these samples.
In this case, a titrant (KOH) is added to the oil and solvent mixture until the mixture is "neutral." This is detected using a potentiometer and indicated by an inflection point in the titration curve. Using a titrant up to this inflection point indicates AN.
The Acid Number allows conclusions to be drawn regarding the oxidation of the oil and the breakdown of oil additives when compared to the values of fresh oil. Provides supplementary information needed to extend oil change intervals. SAN (Strong Acid Number) in mgKOH/g is recorded in AN titration only when the oil contains strong, aggressive acids such as those used in landfill gas engines.
The test method can be used to indicate the relative changes that occur in an oil during use under oxidizing conditions, regardless of the color or other characteristics of the resulting oil. Although the titration is done under certain equilibrium conditions, the test method is not intended to measure an absolute acidic property that can be used to predict the performance of an oil under service conditions. A general relationship between bearing corrosion and acid number is not known.
In new and used oils, components that can be considered to have acidic properties include organic and inorganic acids, esters, phenolic compounds, lactones, resins, heavy metal salts, ammonia salts and other weak bases, acid salts. polybasic acids and additives such as inhibitors and detergents.
EUROLAB, with its more than 25 years of experience, state-of-the-art accredited laboratories and expert team, helps you get precise and fast results. Do not hesitate to contact our laboratory for your testing and certification requests.
To get an appointment, to get more detailed information or to request an evaluation, you can ask us to fill in our form and reach you.
EUROLABreporting and certification activities, United Accreditation Foundation (UAF), Turkish Accreditation Agency (TÜRKAK) ve Enterprise Accreditation Foundation (EAF) based on the accreditation provided by the accreditation body. The Enterprise Accreditation Foundation (EAF) accreditation body is also a signatory of the United Nations (UN GLOBAL COMPACT) organization.
