Neutralization number
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(Redirected from Acid number)
Neutralization Number(or acid number) mg of KOH required to neutralize the acid in 1 g of oil. The neutralization number is a measure of the acid or alkaline content of new oils and an indicator of the degree of oxidation degradation of used oils. This value is ascertained by titration, a standard analytical chemical technique, and is defined as the number of milligrams of potassium hydroxide required to neutralize one gram of the lubricant.
