ISO 3448:1992

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.