A magnetic stirrer is a laboratory device that employs a rotating magnetic field to cause a stir bar immersed in a liquid to spin very quickly, this stirring it. The stir bar's motion is driven by rotating magnet or assembly of electromagnets in the stirrer device, beneath the vessel containing the liquid. Stir bars are typically coated in PTFE, or in glass which are intended to be chemically inert, not contaminating or reacting with the reaction mixture they are in. Glass is an alternative if PTFE is unsuitable in some cases. Many stir bars range from few mm long to few cm long, and have a pivot ring around the center on which they rotate.






Spinbar® Giant Polygon, with Pivot Ring

Teflon® PTFE With Center Molded Pivot Ring

Designed for stirring large volumes in vessels such as drums and tanks. A molded pivot ring minimizes the contact area between the bar and the vessel, thus reducing friction and chattering.

  • Marring of plastic containers is diminished
  • Multifaceted surface adds turbulence relative to similar size smooth cylindrical stirring bars
  • Alnico magnet encapsulated in FDA Grade, USP Class VI Teflon® brand PTFE Coating – Superior Chemical Compatibility
  • Manufactured in a registered ISO 9001:2015 facility, as verified by SGS certification
  • Autoclave safe

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Spinbar® Micro (Flea) Bars

Small Sample Mixing

Designed for small volume mixing in vessels such as vials, tubes and gradient makers.

  • Particularly useful for environmental testing and life science applications in which small sample volumes need to be prepared and evaluated
  • Alnico magnet encapsulated in FDA Grade, USP Class VI Teflon® brand PTFE Coating; Superior chemical compatibility
  • Manufactured in a registered ISO 9001:2015 facility, as verified by SGS certification
  • Autoclave safe

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Pyrex Spinbar Magnetic Stirring Bar

Pyrex® Spinbar® glass encapsulated Alnico magnet stirring bars are useful for high temperature applications up to 274˚C (525˚F).

  • Completely smooth surface offers “zero absorption”; easy to clean
  • Meets US Pharmacopoeia specifications for Type I Borosilicate glass
  • Manufactured in a registered ISO 9001:2015 facility, as verified by SGS certification
  • Autoclave safe

Note: To avoid breakage, Pyrex glass Stirbars should be carefully placed in the bottom of your stirring vessel and not ‘dropped’.

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Spinbar® Rare Earth - Samarium Cobalt Magnetic Stirring Bars

Reduce Spinout in Viscous Solutions!

Reduce frequency of spinout in viscous solutions or when stirring at high speeds. The high magnetic field strength of Samarium Cobalt (Rare Earth) magnets can provide up to three times stronger coupling vs. Alnico magnetic stirring bars.

  • Stronger coupling with the drive magnet keeps the stirring bar centered and rotating effectively
  • Octagon shape with pivot ring creates strong turbulence with minimal chattering and friction
  • Encapsulated in bright green, FDA grade, USP Class VI Teflon® PTFE; easy to differentiate from other stirring bars
  • Autoclave safe
  • Manufactured in a registered ISO 9001:2015 facility, as verified by SGS Certification

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Guide for chosing Spinbar® Magnetic Stirring Bar