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.

Cylindrical Stir BarCylindrical Stir BarGeneral purpose stirrer for

smooth stirring

Plain Stir Bar Plain Stir BarSimilar to cylindrical, but with

more turbulence at low speed.

Pivot Ring Stir Bar Pivot Ring Stir BarFor 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 BarSimilar to the pivot ring type, but

with more turbulence at low speed.

Spherical Stir Bar Spherical Stir BarFor 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

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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