With a wide variety of impeller styles and size available in the marketplace, it can be difficult to know where to begin.

We are here to help you choose the right stirring impeller for your industrial mixer machine.


1) Application

Before the selection process, ask yourself what the objective of your mixing are, what you are looking to achieve and what to avoid.

Before you settle on a certain impeller type, determine which factors that will produce the best results in your application.


2) Flow

Defining the application helps in identifying a flow pattern that will ultimately optimize your process.

Axial flow, for instance, is ideal for  liquid-liquid blending, or stirring needing a vortex.

The radial flow, on the other hand, is ideal for applications such as gas-liquid dispersion or emulsion mixing.

Finally, tangential flow is often desired in a high viscosity mixer, which achieves the flow with an anchored paddle or square blade.


3) Viscosity

The viscosity determines the thickness or lightness of a fluid.

Generally, a prop impeller is ideal for the water-like and low viscosities, while the pitched blade turbine alongside the blade turbines is effective at mixing higher viscosity substances.

For the extreme viscosity, the square blade, together with the anchor paddles often provide the desired results.


4) Material

While there are a variety of materials to choose from for your stirring impeller, stainless steel is the most popular, and it’s for a good reason.

Stainless steel is low maintenance, easy to clean and resistant to corrosion and most chemical reactions.

However, remember that your choice of material depends on your specific application.  Teflon, for instance, is ideal for applications that involve acids or other applications that involve harsh conditions not suitable for exposure to the metal.


5) Speciality

Some speciality styles work well with certain applications. For instance, the collapsible impellers are an awesome choice when you need fitting your impeller in a narrow-necked reaction flask or carboy.

Anchor impellers, on the other hand, feature sweep attachments that slide over the blade, gently scraping the thick product.

However, your desired impeller style might not be available and might require a custom order at sofraden.