ISO 2977:1997

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Petroleum products and hydrocarbon solvents — Determination of aniline point and mixed aniline point

ISO 2977:1997 refers to an International Standard published by the International Organization for Standardization (ISO) that specifies a method for determining the "aniline point" and "mixed aniline point" of petroleum products and hydrocarbon solvents; essentially, it's a test used to measure the compatibility of a substance with aniline, providing information about the chemical composition of the product.