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Base Number

ASTM method - D4739

Measures the reserve alkalinity in a lubricant.


Operating Principle. A weighed amount of sample in titration solvent is titrated with a hydrochloric acid solution to a definite end point.

Significance. The amount of reserve alkalinity in a lubricant is critical for certain oils. Often an oil is fortified with alkaline additives to combat acid formation. The TBN is at its highest as a new oil and decreases with service.

BASE NUMBER (mg KOH / g)
Date Reference 1/11/07 12/7/06 11/2/06 10/19/06
Lab 107391 168113 168112 168111 168110
Base # 8.5 6.0 5.8 7.1 7.5

Applications. Diesel engines.

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Insight Services, Inc.  •  20338 Progress Drive  •  Strongsville, OH 44149  •  Phone: 216-251-2510  •  Fax: 216-251-2515
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