ISO 6619:1988

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ISO 6619:1988 refers to an international standard published in 1988 that outlines a method for determining the "neutralization number" of petroleum products and lubricants using potentiometric titration, essentially measuring the acidic constituents present in a substance soluble in a mixture of toluene and propan-2-ol; it's a way to assess the acidity level of a lubricant or oil sample.