![]() By multiplying the time measured by the tube factor a viscosity in centistoke (cSt) is calculated. The oil is started flowing and the time for the oil to pass by two regions on the tube is measured. Viscosity is performed by adding a preset volume of oil to a calibrated viscosity tube which is immersed in a temperature controlled bath (typically either 40☌ for industrial oils and other fluids, or 100☌ for engine oils). Viscosity is the most important single property of a lubricant.
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