Fuel and Lubricant Testing


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ASTM D974 - Acid and Base Number by Color-Indicator Titration


We perform lubricants testing by ASTM D974 to determine the acidic or basic constituents (acid number or base number) in petroleum products and lubricants. New and used petroleum products can contain basic or 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 acids or bases. This number, whether expressed as acid number or base number, is a measure of this amount of acidic or basic substances in the oil, always under the conditions of the test. This number is used as a guide in the quality control of lubricating oil formulations. It is also sometimes used as a measure of lubricant degradation in service. 

Acid/Base Number by ASTM D974 determines the acidic or basic constituents in petroleum products and lubricants that are soluble or nearly soluble in mixtures of toluene and isopropyl alcohol.

We also perform acidity and acid number testing by ASTM D1613ASTM D3242, ASTM D664ASTM D7795ASTM D847IP 139IP 177IP 354ISO 6618ISO 6619, and SAE ARP5088. These different test methods use different instruments or procedures or are used for certain sample types. Click on the test method number to learn more about each test.

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Sample quantity required: 50 ml

ASTM D974 corresponds to ISO 6618 and IP 139.

For additional information on this test method or to purchase a copy of the method, please click HERE to open a new window and visit the ASTM website.