For a slide bearing or gear unit, the kinematic viscosity at 40 °C and 100 °C does not usually constitute sufficient information to draw conclusions.
In order to design bearings, lubrication holes, pump pressures or tooth widths, a design engineer often requires the actual dynamic viscosity at precisely defined upper and lower threshold temperatures.
A common calculation method for viscosities is based on the viscosity index (VI) which is calculated with the kinematic viscosity at 40 °C and 100 °C. Especially for very high or low temperatures, the viscosity temperature profiles depending on the used base oil are usually not linear. Therefore, an extrapolation over the VI for a precise component design is frequently too imprecise.With the Anton Paar Rheometer Physica MCR 301 we create a detailed viscosity temperature profile for the lubricant. With this information, a precise component design referring to the lubricant in use and the expected operating temperatures is possible.