Magnetic Stir Bars

Magnetic Stir Bars, Stirring Bars and Rods, PTFE Magnetic Stirrer Mixer Stir Bar, Magnetic Stir Bar Retriever, Magnetic stirrer with hotplate, Micro Magnetic Stirrer Bar, PTFE/ALNICO V MAGNET, standard laboratory magnetic stir bar China supplier and factory

Magnetic stir bars (aka lab stirrers) are the key accessory for magnetic stirrers. Using the strange sorcery of magnetism, stir bars rotate within the host liquid to provide safe, efficient stirring.

Manufactured from ALNICO (an alloy of aluminium, nickel, iron and cobalt) magnets encapsulated with PTFE coating. Cylindrical magnetic stirring bars offer for a wide variety of applications providing excellent mixing effect. Polished finish provides excellent centering and smooth uninterupted stirring. Their perfect contacts with the base of the flask reduce the risk of ricochet during stirring.

Magnetic stir bars

Magnetic stir bars

Lab stirring bars are almost always PTFE-coated. PTFE provides sufficient resistance to most of the chemicals that might require stirring.

The real variety in stirring bars are the shapes. Our selection includes the usual cylindrical / round stir bars, but also available are triangular, octagonal, egg-shaped, spin vanes, and cross-head magnetic stir bars.

The stirrer magnet is a bar magnet encapsulated in a material which protects the magnet and prevents contamination of the liquid medium.

The core of the stirrer magnet is usually Alnico V, a less used alternative is Samarium-Cobalt. Due to its exceptional chemical and thermal (-200 °C to +260 °C) properties, Polytetraflouroethylene is the most preferred encapsulant. It can easily be processed, is readily sterilised and satisfies FDA and USP Class IV requirements.

In principle, it is difficult to find the most effective magnetic stirring bar for a particular application, but important factors are the vessel shape and the viscosity of the stirring medium. In a petri dish, a long stirring bar at low speed will be effective, in a round bottom vessel egg-shaped (oval) magnetic stirrers will be a suitable choice. The ideal configuration is where the magnet of the stirring bar and the magnet of the drive are of equal length and with a minimum distance between them.

Cylindrical magnetic stirring bar » Oval or Egg-shaped magnetic stirring bar » Magnetic stirring bar with bearing neck » Magnetic stirring bar for cuvettes » Magnetic stirring bar for culture bottles » Custom manufacture for flanged reactors

Teflon PTFE Octahedral Rare Earth Magnets

Teflon PTFE Octahedral Rare Earth Magnets

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Teflon Oval Egg Shaped Rare Earth PTFE Magnets

Teflon Oval Egg Shaped Rare Earth PTFE Magnets

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PTFE ELLIPTICAL RARE EARTH MAGNETS

PTFE ELLIPTICAL RARE EARTH MAGNETS

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Rare Earth Cylindrical PTFE Magnets

Rare Earth Cylindrical PTFE Magnets

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Ball Sphere Magnetic Stirring Bar Teflon PTFE

Ball Sphere Magnetic Stirring Bar Teflon PTFE

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PTFE Spherical Magnetic Stirring Bar 12mm

PTFE Spherical Magnetic Stirring Bar 12mm

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Ball Magnetic Stirring Bars

Ball Magnetic Stirring Bars

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Borosilicate Glass Encased Magnetic Stirring Bars

Borosilicate Glass Encased Magnetic Stirring Bars

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PTFE White Glass Coated Magnetic Stir Bars

PTFE White Glass Coated Magnetic Stir Bars

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Glass Encapsulated Magnet Stirring Bar

Glass Encapsulated Magnet Stirring Bar

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Borosilicate Magnetic Stir Bar For High Temperature Reactions

Borosilicate Magnetic Stir Bar For High Temperature Reactions

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Disposable Magnetic Stirring Bars Teflon PTFE

Disposable Magnetic Stirring Bars Teflon PTFE

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PTFE SQUARE Magnetic Stir Bars

PTFE SQUARE Magnetic Stir Bars

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V-Shaped PTFE Magnetic Stir Vane

V-Shaped PTFE Magnetic Stir Vane

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Wing Style Magnetic Stir Bars PTFE

Wing Style Magnetic Stir Bars PTFE

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Color-Coded Magnet Dumbbell-Style Stir Rods

Color-Coded Magnet Dumbbell-Style Stir Rods

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Circulus Dumbbell-shaped Magnets PTFE Stir Bars

Circulus Dumbbell-shaped Magnets PTFE Stir Bars

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Colorful Magnetic Dumbbell Stirring Bar

Colorful Magnetic Dumbbell Stirring Bar

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Dumb Bell Stirring Bar Magnet

Dumb Bell Stirring Bar Magnet

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Dumbell Shape Magnetic Stir Bar AlNiCo

Dumbell Shape Magnetic Stir Bar AlNiCo

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Double Ended Magnetic Stir Bar

Double Ended Magnetic Stir Bar

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Teflon PTFE Triangle Magnet Stir Bars

Teflon PTFE Triangle Magnet Stir Bars

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Teflon Coated Triangular Bar Magnets

Teflon Coated Triangular Bar Magnets

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Plastic Rectangular Triangle Magnetic Stirring Bar

Plastic Rectangular Triangle Magnetic Stirring Bar

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Triangular Bar PTFE ALNICO V MAGNET

Triangular Bar PTFE ALNICO V MAGNET

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PTFE Triangular Magnetic Stirring Bars

PTFE Triangular Magnetic Stirring Bars

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Spinstar Teflon Magnetic Stirring Bar fits Beakers

Spinstar Teflon Magnetic Stirring Bar fits Beakers

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PTFE Beaker Bar Magnetic Stirrer

PTFE Beaker Bar Magnetic Stirrer

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