TAN030/3 Acid Number (AN)

ISO/IEC 17025 and ISO 17034 Acid Number (AN) / Total Acid Number (TAN) Certified Reference Material (CRM) intended to be used for verification of measuring equipment, method validation, method verification, or other quality control processes used to determine acid number by potentiometric titration, applicable for the test method ASTM D664, or test methods IP 177, ISO 6619, or other applicable methods.

New and used petroleum products may contain acidic constituents that are present as additives or as degradation products formed during service, such as oxidation products. The relative amount of these materials can be determined by titrating with bases. The acid number is a measure of this amount of acidic substance in the oil always under the conditions of the test. The acid number is used as a guide in the quality control of lubricating oil formulations. It also is sometimes used as a measure of lubricant degradation in service.

Acid number - n The quantity of base, expressed in milligrams of potassium hydroxide per gram of sample, required to titrate a sample in the solvent from its initial meter reading to a meter reading corresponding to a freshly prepared aqueous basic buffer solution or a well-defined inflection point as specified in the test method

ARO's Acid Number (AN) / Total Acid Number (TAN) Certified Reference Material has been characterised in accordance with ASTM D664, Method A. Manufacturing, testing and certification has been performed in accordance with ARO's accreditation to ISO/IEC 17025 and ISO 17034, UKAS CAB No. 27393.

• • Manufactured and Characterised in strict accordance to ISO/IEC 17025 and ISO 17034
• • Highest level of accreditation guarantee, providing the most credible certified data available worldwide
• • Typically used in, but not limited to, the analysis of used oils and lubricants
• • Acid Number (AN) certified reference materials are characterised in strict accordance with ASTM D664
• • Fully traceable to international standards
• • Supplied in tamper-evident glass packaging, providing assurance of sample integrity
• • Available as a single or triple pack
• • Manufactured in the United Kingdom by ARO Scientific Ltd
• • 24 month shelf life

Our commitment to quality and our accreditations demonstrates that we have rigorous quality systems in place that allow us to provide customers with the highest quality products possible, which are accepted globally. In addition, our Combined UKAS and ILAC-MRA Mark demonstrates that the accreditation we hold is recognised under the International Laboratory Accreditation Cooperation (ILAC) Mutual Recognition Arrangement, our certificates are accepted around the world.