7. FAQ's and Knowledgebase / Stirring and heating

How do I choose a magnetic stirring bar / magnetic flea?

Choosing a magnetic stir bar (also known as magnetic fleas) which is the right shape and size for your task can make the stirring action much more effective.

hotplate stirrer with magnetic flea mixing
Mixing with a magnetic stir bar on a hotplate stirrer

Use our guide below to choose a suitable magnetic stirring bar…

Choosing the right shape of magnetic stir bar will ensure the mixing is efficient and reduce wear and abrasion of the PTFE coating.

Image Name Applications
Cylindrical Stir Bar Cylindrical Stir Bar General purpose stirrer for

smooth stirring

Plain Stir Bar  Plain Stir Bar Similar to cylindrical, but with

more turbulence at low speed.

Pivot Ring Stir Bar  Pivot Ring Stir Bar For use where the container base

is slightly curved or uneven.

The pivot lets the stir bar adopt

the optimum position for stirring.

Octahedral Stir Bar  Octahedral Stir Bar Similar to the pivot ring type, but

with more turbulence at low speed.

Spherical Stir Bar  Spherical Stir Bar For stirring in test tubes or

eccentric stirring

Oval Stir Bar  Oval Stir Bar  For use in round bottom flasks

(aka boiling flasks)

Cross Stir Bar  Cross Stir Bar  Suitable for general purpose stirring

but very stable to reduce “jumping”

Crosshead Stir Bar  Crosshead Stir Bar  For use in tube shaped containers or

other containers – ideal when working

in both test tubes and beakers or flasks.

 Triangular Stir Bar  For dissolving solids or mixing of

sediments. The flat base gives a scraping

action for disturbing solids.


For more information on PTFE magnetic stir bars, just follow the links above or contact us

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One thought on “How do I choose a magnetic stirring bar / magnetic flea?

  1. This is very useful blog you have share here for guidance of how to select best magnetic stirrer hot plate for preparing chemicals in laboratories for research works.

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