Spinbar Magnetic Stirring Bar Guide

Our Magnetic Stir Bars feature ALNICO V magnetic cores, which are one of the most powerful permanent magnet alloys available. Offered in many shapes from round, octagonal, egg-shaped, and more, these PTFE-coated Magnetic Stir Bars resist harsh chemicals and are resistant to scratching and high temperatures.

stir bar in beaker

Life Span of a Stir Bar

There are several measures that should be taken to increase the life span of magnetic stir bars. First, store them in pairs to maintain magnetic strength. They should not be stored in a random mass or dropped on a hard surface, especially steel. PTFE thickness accounts for 18% of its diameter.

The Spin Bar for Your Application:


Capsule

Capsule

The capsule magnetic stirring bar features a polygon magnetic piece that spins freely inside a protective capsule. The capsule ensures the bar does not spin off center and reduces turbulence and obstructions to ensure consistent, smooth stirring


Cell

Cell

Cell magnetic stirring bars are designed specifically for use with spectrophotometer cells, cuvettes, or test tubes. When placed on a magnetic stirring machine, the cell stirrer fits into standard 10mm spectral cells and provides rapid vertical and horizontal mixing with a minimum of vortexing. Centrifugal pumping action, generated by the cross channels in the upper face, mixes without aeration.


Circulus

Circulus™

Circulus™ magnetic stirring bars provide strong turbulence at relatively low speeds, offer reduced surface contact, and have excellent centering characteristics, particularly in vessels with convex bottoms.


Cylindrical

Cylindrical

Cylindrical magnetic stirring bars offer excellent centering and smooth-running characteristics. A small removable pivot ring in the center adds to their versatility. The pivot ring minimizes the contact area of the bar to the vessel, reduces friction, and lessens the marring of plastic containers.


Elliptical

Elliptical (Egg-Shaped)

Elliptical (Egg-Shaped) magnetic stirring bars are particularly well suited for round bottom flasks. Their shape mimics that of a flask and ensures complete mixing. They also offer minimal contact when used in plastic containers.


Fluted octagonal–Rare earth magnet

Fluted Octagonal–Rare Earth Magnet

This bar has eight sides and tapers to conical ends. It has flutes that create turbulence and help move fluids efficiently. Available only in Rare Earth (Samarium Cobalt), the shape and magnet strength make these bars especially well-suited for viscous solutions.


Micro

Micro (Flea)

Micro (Flea) magnetic stirring bars are designed for stirring small volumes in vessels such as vials, tubes, and gradient makers. Available in a variety of colors and sizes, micro (flea) stirring bars are particularly useful for environmental testing and life science applications in which small sample volumes need to be prepared and evaluated.


Octagon

Octagon

Octagon magnetic stirring bars with integral pivot rings are the most commonly used shape. Their interrupted profile provides greater surface area and added turbulence compared to cylindrical bars' smooth surface. The pivot ring aids in reducing friction and chattering.


Octagon – Spinfinity

Octagon, Spinfinity®

Octagon – Spinfinity®: The octagonal shape was also selected for the Spinfinity® line. Spinfinity® magnetic stirring bars have a hard plastic casing that gives them superior durability in granular slurries. Quickly identify Spinfinity® magnetic stirring bars by their bright purple coating.


Octagon – Rare earth magnet

Octagon, Rare Earth Magnet

Octagon – Rare Earth Magnet: The superior magnetic energy of Rare Earth (Samarium Cobalt) magnets provides strong coupling with drive magnets, reducing the frequency of spinout in viscous solutions or high-speed stirring. The bright green PTFE coating makes them easy to identify in the laboratory.


Polygon/Giant Polygon

Polygon, Giant Polygon

Polygon/Giant Polygon multifaceted surfaces add turbulence relative to similar smooth-size cylindrical bars. Giant Polygon bars can be used for stirring substantial volumes in large vessels such as drums and tanks. Available with or without a molded pivot ring, this ring minimizes the contact area between the bar and the vessel, thus reducing friction and chattering.


Pyrex® Spinbar® Glass Stirring Bars

Pyrex® Spinbar® Glass Stirring Bars

Pyrex® Spinbar® Glass Stirring Bars are completely encapsulated in Pyrex® glass. Glass stirring bars are useful for high-temperature applications in excess of 225°C (437°F) where PTFE is not stable. Glass bars also offer “zero absorption” of the stirred solution.


Round

Round

Round magnetic stirring bars with tapered ends have a naturally centered pivot point, eliminating the need for a separate pivot ring. The smooth surface and the slightly raised ends on these bars facilitate efficient movement through solutions.


Saturn Spinbar® Magnetic Stirring Bars

Saturn Spinbar® Magnetic Stirring Bars

Saturn Spinbar® Magnetic Stirring Bars easily stir powders into solutions without getting stalled. A prominent sphere in the middle of the bar elevates the stirring bar arms during rotation. Consequently, it diminishes the surface contact area, permitting the magnet to spin freely without stalling. For use in round or flat bottom vessels.


Spinfin®

Spinfin®

Spinfin® magnetic stirring bars can be used in round bottom flasks as well as rounded vessels such as test tubes or cylinders.


Spinplus

Spinplus®

Spinplus® magnetic stirring bars add speed and efficiency to mixing operations. The “+” shape creates a deep vortex and provides stable, quiet operation.


Spinring

Spinring®

Spinring® stirring bars provide maximum stabilization of the magnetic stirring bar with the addition of a “hoop” around a standard octagonal bar. The friction fit of the “hoop” and bar allows them to spin as a unit. By presenting a greater surface area and wider profile, “spin out” is virtually eliminated. This particular arrangement is best suited for larger open-neck vessels, such as buckets and beakers.


Spinstar

Spinstar®

Spinstar® magnetic stirring bars create a deep mixing vortex at relatively slow speeds. Designed to fit the inside diameter of most commonly-used beakers, the Spinstar® stirring bar is perfect for applications requiring slow, thorough mixing.


Spinvane

Spinvane®

Spinvane® magnetic stirring bars are designed for test tubes, micro vials, and conical bottom centrifuge tubes. Each style is manufactured for a specific size tube but can be modified if needed without affecting the magnet.


Spinwedge®

Spinwedge®

Spinwedge® magnetic stirring bars provide strong turbulence at fairly low speeds and are well suited for churning sediment or dissolving salts.


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