ISO 3448:1992

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Industrial liquid lubricants — ISO viscosity classification

ISO 3448:1992 refers to an International Standard established by the International Organization for Standardization (ISO) that defines a system for classifying the viscosity of industrial liquid lubricants, including mineral oils, hydraulic fluids, and electrical oils, based on their kinematic viscosity; essentially, it provides a standardized way to measure and categorize the "thickness" of industrial lubricating fluids