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Full Description

1.1 This test method covers procedures for the determination of acidic constituents in petroleum products, lubricants, biodiesel, and blends of biodiesel.

1.1.1 Test Method A-For petroleum products and lubricants soluble or nearly soluble in mixtures of toluene and propan-2-ol. It is applicable for the determination of acids whose dissociation constants in water are larger than 10-9; extremely weak acids whose dissociation constants are smaller than 10-9 do not interfere. Salts react if their hydrolysis constants are larger than 10-9. The range of acid numbers included in the precision statement is 0.1 mg/g KOH to 150 mg/g KOH.

1.1.2 Test Method B-Developed specifically for biodiesel and biodiesel blends with low acidity and slightly different solubility. This test method requires the use of an automatic titrator with automatic endpoint-seeking capability.

Note 1: In new and used oils, the constituents that may be considered to have acidic characteristics include organic and inorganic acids, esters, phenolic compounds, lactones, resins, salts of heavy metals, salts of ammonia and other weak bases, acid salts of polybasic acids, and addition agents such as inhibitors and detergents.

1.2 The test method may be used to indicate relative changes that occur in oil during use under oxidizing conditions regardless of the color or other properties of the resulting oil. Although the titration is made under definite equilibrium conditions, the test method is not intended to measure an absolute acidic property that can be used to predict performance of oil under service conditions. No general relationship between bearing corrosion and acid number is known.

Note 2: The acid number obtained by this standard may or may not be numerically the same as that obtained in accordance with Test Methods D974 and D3339. There has not been any attempt to correlate this method with other non-titration methods.

Note 3: A few laboratories have made the observation that there is a difference in Test Method D664 results when aqueous versus nonaqueous buffers are used.

1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

 

Document History

  1. ASTM D664-18e2

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    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Most Recent
  2. ASTM D664-18e1


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  3. ASTM D664-18


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  4. ASTM D664-17a


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  5. ASTM D664-17


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  6. ASTM D664-11a(2017)


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  7. ASTM D664-11ae1


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  8. ASTM D664-11a


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  9. ASTM D664-11


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  10. ASTM D664-09a


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  11. ASTM D664-09


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  12. ASTM D664-07


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  13. ASTM D664-06ae1


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  14. ASTM D664-06a


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  15. ASTM D664-06


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  16. ASTM D664-04


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  17. ASTM D664-04e1


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  18. ASTM D664-01


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  19. ASTM D664-95(2001)e1


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version
  20. ASTM D664-95


    Standard Test Method for Acid Number of Petroleum Products by Potentiometric Titration

    • Historical Version