Anton Paar Viscosity Index Calculator

Formula

The formula to calculate the Viscosity Index is:

\[ VI = \frac{L - U}{L - H} \times 100 \]

Where:

\(VI\) is the Viscosity Index
\(L\) is the kinematic viscosity of the oil at 40°C (cSt)
\(U\) is the kinematic viscosity of the oil at 100°C (cSt)
\(H\) is the kinematic viscosity of a reference oil at 100°C (cSt)

What is an Anton Paar Viscosity Index?

The Anton Paar Viscosity Index is a measurement used to determine the change in viscosity of a fluid or oil with temperature. It is a crucial parameter in the lubrication industry as it helps in assessing the performance of lubricating oils under varying temperatures. The index is derived from the viscometer readings at 40°C and 100°C. Higher values of the index indicate a smaller decrease in viscosity with increasing temperature, which is desirable for lubricants. Anton Paar is a company that manufactures instruments for measuring this index.

Example Calculation

Let's assume the following values:

Kinematic Viscosity at 40°C (L) = 150 cSt
Kinematic Viscosity at 100°C (U) = 15 cSt
Kinematic Viscosity of Reference Oil at 100°C (H) = 10 cSt

Using the formula:

\[ VI = \frac{150 - 15}{150 - 10} \times 100 = \frac{135}{140} \times 100 = 96.43 \]

The Viscosity Index (VI) is 96.43.