This Gulf standard is concerned with the international standard viscosity classification for industrial liquid lubricants and related fluids. It is applicable to mineral oils used as lubricants, hydraulic fluids, electrical oils and for other applications. The usual method for kinematic viscosity determination is that specified in the GSO …/… but this method may give anomalous results when used with non-Newtonian fluids whose viscosity varies significantly with rate of shear. For such fluids, it is therefore important to state the particular method by which viscosity has been determined. It is also recognized that this classification may not be applicable to some pure chemicals and naturally occurring products used as lubricants.