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Acid Number

Acid Number Test

Measures the acidity of a lubricant.

Operating Principle

A sample of known weight in titration solvent is titrated with a potassium hydroxide solution to a definite end point.

Significance

Organic acids, a by-product of oil oxidation, degrade oil properties and lead to corrrosion of the internal components. The Acid Number is lowest as a virgin oil and can gradually increase with use. High acid levels are typically caused by oil oxidation.

Applications

All lubricating systems where extended drain intervals are considered. Limited applications for combustion engines.


Acid Number (mg KOH / g)
Date 98-10-17 98-09-18 98-08-21 98-07-21 98-06-20
Lab Number 10713 9733 8759 8173 7695
Acid Number 2.05 1.95 1.98 1.67 1.70

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