ISO 21493:2019

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Petroleum products — Determination of turbidity point and aniline point equivalent

ISO 21493:2019 is an international standard that specifies a method to determine the "turbidity point" of petroleum products, essentially a measure of the aromatic content within a hydrocarbon mixture, by observing the point at which a mixture of the petroleum product and aniline becomes cloudy when cooled down; it's primarily used to analyze distillates derived from crude oil.