ISO International Standard

Industrial liquid lubricants — ISO viscosity classification

Establishes a system of viscosity classification for industrial liquid lubricants and related fluids including mineral oils used as lubricants, hydraulic fluids, electrical oils and for other applications. The usual method for kinematic-viscosity determination is that specified in ISO 3104. There may be some pure chemicals and naturally occurring products, used as lubricants, which will not fall within the classification.

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