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
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
Crosshead Stirrer Magnets Double Side
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Crosshead PTFE Double Sided Magnetic Stir Bars
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Double Cross Head Teflon Magnetic Stirring Bars
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PTFE Cross Head Magnet Stirrer Bar
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Teflon Coated Double Crosshead Magnetic Stir Bar
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Color-coded Teflon Micro Magnets Stir Stirrer Bars
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Micro PTFE Magnets Stir Rod Laboratory Bar
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Micro Power Magnetic Stirring Bars
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Micro Spinbar PTFE Stir Mixer Magnets
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Round Cylindrical Micro PTFE Stir Bars
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Large Stir Bars PTFE Coated Magnet Cylinder Rod
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Giant Round Cylindrical Teflon Magnet Stir Bar
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Heavy Duty PTFE Stir Bar Cylindrical Style Magnets
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Octagonal Color-Coded Colored Stirring Bar Magnet Kit
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Colorful Magnetic Stirring Bar Octagon Style
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Assortment Magnetic Stir Bars Octagonal Style
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Assorted Colors Stirring Bars Teflon Octagon Magnets
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Octagon Magnetic Stir Bar Magnetic Beats Plain
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Teflon Octagonal Magnet Stirring Rod
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Teflon Octagonal Magentic Stirrer Bar
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PTFE Encapsulated Magnet Stirrer Bar Octagon Shaped
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Octagonal Shape Magnets Stirrer Mixer Bar
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Octagon Magnetic Stirring Bars
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Ellipse Magnetic Stirring Bar with Teflon Coating
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PTFE Turbo Rare Earth Elliptical Magnet Stirrer Bar
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Lab Rare Earth Magnet Egg Shaped Stir Bars Kits
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Low-friction PTFE Coating Rare Earth Egg Shaped Magnets
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Teflon Egg-Shaped Elliptical Magnet Stirring Bar
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