Correct stirring rotor size

How to choose the optimum laboratory stirrer for your application

Choosing the right stirrer size for laboratory stirrers is crucial for uniform mixing in the vessel and to achieve the desired result.
What factors need to be considered when selecting a stirrer?

How to select the correct stirring rotor size

Different stirrer types are used depending on the container size and application. The choice of the correct stirrer size depends on the diameter of the container.
The values below can be used to calculate the correct size for each stirrer.

Behälter mit Rührwerk – Auswahl der richtigen Rührergröße für optimale Durchmischung in der Rührtechnik

Propeller stirrer

The correct size for the propeller stirrer can be calculated as follows:

Diameter of the container x min. 0.1 to max. 0.5

Example:
Container size 30 cm
30 cm x 0.1 = 3 cm
30 cm x 0.5 = 15 cm
The propeller stirrer may have a minimum diameter of 3 cm and a maximum diameter of 15 cm.

BuddeMix

The correct size for the BuddeMix stirrer can be calculated as follows:

Diameter of the container x min. 0.3 to max. 0.75

Example:
Container size 30 cm
30 cm x 0.3 = 9 cm
30 cm x 0.75 = 22.5 cm
The BuddeMix stirrer may have a minimum diameter of 9 cm and a maximum diameter of 22.5 cm.

Diagonal blade stirrer

The correct size for the diagonal blade stirrer can be calculated as follows:

Diameter of the container x min. 0.25 to max. 0.5

Example:
Container size 30 cm
30 cm x 0.25 = 7.5 cm
30 cm x 0.5 = 15 cm
The diagonal blade stirrer may have a minimum diameter of 7.5 cm and a maximum diameter of 15 cm.

Dissolver stirring rotor

The correct size for the dissolver stirring rotor can be calculated as follows:

Diameter of the container x min. 0.2 to max. 0.5

Example:
Container size 30 cm
30 cm x 0.2 = 6 cm
30 cm x 0.5 = 15 cm
The dissolver stirrer may have a minimum diameter of 6 cm and a maximum diameter of 15 cm.

Anchor stirring rotor

The correct size for the anchor stirring rotor can be calculated as follows:

Diameter of the container x min. 0.9 to max. 0.98

Example:
Container size 30 cm
30 cm x 0.9 = 27 cm
30 cm x 0.98 = 29.4 cm
The anchor stirrer may have a minimum diameter of 27 cm and a maximum diameter of 29.4 cm.