ISO 2137:2020

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Petroleum products and lubricants — Determination of cone penetration of lubricating greases and petrolatum

ISO 2137:2020 is an international standard that outlines a method for determining the consistency of lubricating greases and petrolatum by measuring their "cone penetration" using a standardized cone penetrometer; essentially, it defines a test procedure to assess the hardness of a grease sample by how far a cone can penetrate into it under specific conditions.