Shortly after the measurement starts, the rotor reaches equilibrium speed. While the sample’s shear forces drive the rotor, the magnetic effects (Eddy currents) retard its rotation. The measuring rotor with a built-in magnet floats freely in the sample. Each viscosity measuring cell contains a tube which rotates at a constant speed and is filled with sample. The highly precise SVM 4001 viscometer is based on a rotational measuring principle and features two integrated viscosity and density measuring cells. Experience twin power: SVM 4001 Smart Viscometer In fact, VI is applicable for lubricants across all sectors of modern life, be it in food manufacturing or bottling plants, inside transformers or hydraulic machinery. However, the importance of the viscosity index is not just limited to engine oils. Employing 5W or 0W engine oil instead would be the better choice. For instance, while 10W-40 grade engine oil might be perfectly fine for the typical Central European climate, using this type of oil in colder regions might result in a lack of lubrication and eventually lead to engine damage. Why is it important to know the viscosity index? This is due to the fact that not every lubricant oil can be utilised for every purpose. An oil with a low viscosity index will have significantly different viscosities at different temperatures.An oil with a high viscosity index will show only small changes in viscosity when the temperature changes.

This dimensionless number describes the behavior of a lubricant’s viscosity with changing temperature. When it comes to characterising lubricants and assessing their quality, the most important parameter is the viscosity index (VI). In order to fit the wide variety of applications, lubricants are available in many different formulations. Additionally, lubricants are also needed to transmit forces and transfer heat.

First and foremost they form a protective film between two moving parts to prevent them from wear and tear, while at the same time allowing the parts to move without requiring too much energy. In this article we discuss the importance of the viscosity index for lubricants. Proper lubrication is needed to keep car engines, wind turbines, and conveyor belts up and running. Our modern society would not be running smoothly without lubricants.

Astm d2270 viscosity index