Viscosity - Table

What is Viscosity?

Viscosity - also known as cSt - is a designation for the inertia of a liquid, gas, or plasma, meaning the ability to flow. For example, water has a low viscosity, while honey and resin have a very high viscosity. Therefore, we also see that water flows much more easily than, for example, honey. Viscosity is often a crucial factor in many production processes - as viscosity can provide information about the concentration, consistency, and flowability of the raw material or final product.

Viscosity in Groups

When measuring viscosity, it is done after dividing the substances into 2 categories. The first category is the so-called Newtonian fluids, and the second category is the so-called non-Newtonian fluids. Depending on their viscosity, these can be divided into 3 different groups.

• High - Including, for example, asphalt, rubber, resin & honey
• Medium - Including, for example, heating oil, paint & fats
• Low - Including, for example, water, petroleum, and lighter oils.

How to Find the Correct Filter

To find the correct filter for your task, it is important to consider the viscosity of the liquid you want to filter. This is done by converting the actual flow to an equivalent flow at 1 cSt (Water).

Qdim = Dimensional flow at viscosity 1 cSt (Water)

Qv = Flow at actual viscosity.

F = Correction factor from the table.

Qdim = F x Qv

Example of calculation:

10 m3 of oil per hour with a viscosity of 120 cSt, to be filtered to a fineness of 250 µm. In the table below, the correction factor for 120 can be read as 1.85 in column F.

Then the dimensional flow Qdim is found by the following calculation:

Qdim = 1.85 x 10 m3/h <=> Qdim = 18.5 m3/h.

This means that a suitable filter for the task must be able to handle 18.5 m3/h to filter the oil to the desired result.