This is illustrated in the table below, which shows the ISO viscosity grade numbers, the mid-points of each bracket, and the viscosity limits For example, ISO viscosity grade 32 relates to the viscosity bracket 28.8 to 35.2 mm2/s, the mid point of which is 32.0 mm2/s. The numbers indicate to the nearest whole number, the mid points of their corresponding brackets. It consists of a series of 18 viscosity brackets between 1.98 mm2/s and 1650 mm2/s, each of which is defined by a number. The ISO viscosity classification uses mm2/s (cSt) units and relates to viscosity at 40oC.
ISO (International Standards Organisation) viscosity classification. Viscosity Classifications INDUSTRIAL LUBRICANT CLASSIFICATIONS
Viscosity / Grade Classifications ExplainedĮngine, Gear Oil & Grease Viscosity / Grade Classifications Explained We explain the mechanics behind the different grade classifications of car / motorcycle oils & greases.
