![]() For most industrial oils, it is common to measure kinematic viscosity at 40C because this is the basis for the ISO viscosity grading system (ISO 3448). It is an important control index in the production process of lubricating oil manufacturers. Typically, the viscosity is reported at one of two temperatures, either 40C (100F) or 100C (212F). The higher the viscosity index, the better the viscosity-temperature characteristics of the oil, and the better the surface oil quality to a certain extent. As an example: 30W oil flows much faster at higher temperatures. The viscosity index number indicates the extent of thickness, or resistance to flow, with temperature changes. The viscosity index characterizes the viscosity-temperature characteristics of lubricating oil. Viscosity rating is a measure of the oil’s resistance to flow or thickness, and is the single most important characteristic of hydraulic oil. The higher the viscosity index, the less the oil viscosity is affected by temperature, the less sensitive the viscosity is to temperature, and the oil can maintain a stable viscosity. The VI of a highly refined mineral oil (hydrotreated) can be up to 120. A traditional mineral oil has a viscosity index between 95 to 100. These measurements are then compared to the results of two reference oils. ![]() What does the viscosity index mean? In fact, it represents the degree of oil change with temperature. The viscosity index of a lubricant is determined by measuring the kinematic viscosity at 40C and 100C. Conversely, the lower the temperature, the larger the value and the higher the viscosity. This value will vary with temperature, the higher the temperature, the smaller the value and the lower the viscosity. The smaller the value, the lower the viscosity. The larger the value, the higher the viscosity. ![]() Kinematic viscosity is an indicator of the fluidity of oil products.
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