- Standards: ASTM D664-18e2
- Unit: mg KOH/g
- Oil quantity: 5 ml
- Application: Wszystkie typy olejów
Method description:
The acid number is the number of milligrams (KOH) equivalent to all components of an acidic nature contained in 1 gram of oil. The test involves potentiometric titration.
Interpretation of results:
The level of the acid number is a direct result of the technology of the additives used. Degradation of these additives can manifest as a reduction in the acid number, on the other hand, the acid number is influenced by oil ageing processes, which manifests itself as an increase in the acid number.
