What is 'acid number' 🧑‍🔧

Hello, my friend! The goal of this article is to clarify "What is 'acid number'" by answering frequently asked questions.

A quick answer is…

A number derived from a standard test indicating the acid or base composition of lubricating oils; it in no way indicates the corrosive attack of the used oil in service.

Acid number is a measure of the amount of potassium hydroxide required to neutralize the acid contained in a lubricant.

Acids are formed as oils oxidize with age and service.

The acid number for an oil sample is indicative of the age of the oil and can be used to determine when the oil must be changed.

I have selected a few questions and answers to help you understand it:

'acid number'

What is acid number in oil test...

Acid Number – This is the concentration of acid in the fluid. The new oil value may not be zero since some oil additives react similar to acids with the reagents used for testing. Hence it is important to monitor the trend in change of TAN from a baseline sample or new oil reference.

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Materials: What is 'acid number' 🧑‍🔧
What is 'acid number' 🧑‍🔧
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