Stirring Bars and Rods
Stirring Bars and Rods
Products of various sizes, shapes, and material compositions designed to aid in manual or automatic stirring of laboratory solutions. Includes glass stirring rods, magnetic stir bars, and stir bar retrievers.
What Is a Magnetic Stir Bar?
Magnetic stir bars are stirrers or stirring hotplates used with magnets to mix a liquid or solution by creating a vortex.
A number of factors affect magnetic stir bar efficiency and effectiveness, including its size, shape, and material. Sizes (L x Diameter) range from 2 x 2 mm to 159 x 27 mm and shapes include:
- Polygonal or octagonal magnetic stir bars are the most common shapes; the multiple surfaces add turbulence to the mixing action
- Elliptical or egg-shapped stir bars work especially well with round-bottom flasks
- Wedge-shaped spin bars produce more significant turbulence for dissolving salts or in samples containing sediment
- Spin bars with fins or vanes, designed for smaller vessels, tubes, or cuvettes
- Micro (“flea”) stir bars for mixing extremely small samples
What Kind of Magnet Is Used?
Stir bar magnets are typically made from Alnico, a combination of aluminum and nickel. They may also be made from Samarium cobalt, a rare earth metal that produces the stronger magnetic force needed to mix very viscous substances.
Stir bar magnets are usually encapsulated in white or colored PTFE, hard plastic, or borosilicate glass, and coatings may meet FDA grade or USP requirements. PTFE is durable, inert, and can be autoclaved. Glass-encased cylindrical magnets are useful for high-temperature applications.
How Does It Work?
During the stirring process, integral or removable pivot rings on the stir bar reduce contact with the vessel to help avoid marring plastic surfaces. Some round stir bars have slightly raised ends that create a de facto pivot point, while others have more pronounced round centers that help to keep them in motion. Stir bars may be reusable or disposable.
Magnetic stir bars may be sold individually or in magnetic stir bar kits that include multiple bars in a range of sizes.
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Filtered Search Results
Fisherbrand™ Polygon Stir Bars
Stirbars have polygon multifaceted surfaces that add turbulence relative to similar smooth size cylindrical bars.
Shape | Polygon |
---|---|
Quantity | 50 |
Material | Alnico Magnet |
Autoclavable | Yes |
Fisherbrand™ Magnetic Stir Bar Six Packs
These magnetic stirring bars are the most commonly used shape.
Quantity | 6 Pk. |
---|---|
Material | Alnico Magnet |
Coating | PTFE |
Autoclavable | Yes |
Fisherbrand™ Cylindrical Spinbar Magnetic Stirring Bar
Cylindrical magnetic stirring bars offer excellent centering and smooth-running characteristics.
Fisherbrand™ Octagon Spinbar™ Magnetic Stirring Bars
Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape for stirring small volumes in vessels such as vials, tubes and gradient makers.
Color | White |
---|---|
Material | Alnico Magnet |
Coating | PTFE |
Certifications/Compliance | ISO 9001:2008 |
Autoclavable | Yes |
Bel-Art™ SP Scienceware™ Octagon Spinbar Magnetic Stirring Bars
Interrupted octagon profile provides greater surface area and added turbulence compared to smooth surface of cylindrical bars.
Includes | Integral pivot ring |
---|---|
Diameter (English) | 0.5 in. |
Type | Stir Bar |
Shape | Octagon |
Length (Metric) | 76.2 mm |
Diameter (Metric) | 12.7 mm |
Length (English) | 3 in. |
Material | PTFE |
Synthware™ Cylindrical Stir Bars
Supplier Diversity Partner
Small and/or diverse supplier based on Federal laws and SBA requirements.
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Small and/or diverse supplier based on Federal laws and SBA requirements.
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PTFE magnetic stir bars feature a pivot ring, and are only intended for use with flat bottom flasks.
Type | Stir Bar |
---|---|
Shape | Cylinder |
Description | Magnetic |
For Use With (Equipment) | Flat Bottom Flasks |
Color | White |
Material | PTFE |
For Use With (Application) | Stirring Liquids |
Autoclavable | Autoclavable |
Bel-Art™ SP Scienceware™ Polygon Spinbar™ Magnetic Stirring Bars without Pivot Ring
Adds turbulence relative to similar smooth size cylindrical bars. SP Scienceware™ Polygon Spinbar™ Magnetic Stirring Bars without Pivot Ring are manufactured in a registered ISO 9001:2008 facility.
Shape | Polygon |
---|---|
Color | White |
Material | Alnico Magnet |
Autoclavable | Yes |
Fisherbrand™ Egg-Shaped Bars
Egg-shaped stirring bars are designed especially for use in round-bottom vessels as they spin unrestricted by the vessel contour.
Shape | Egg |
---|
Fisherbrand™ Micro Stir Bars
Stirring small volumes in vessels such as vials, tubes and grandient makers.
Autoclavable | Yes |
---|
Fisherbrand™ Micro Stir Bars
Micro Color-Coded Stirring Bar For stirring test tubes, micro-beakers, etc.
Shape | Octagon |
---|---|
Material | PTFE |
Bel-Art™ Octagon Spinbar™ Magnetic Stirring Bars
Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape for stirring small volumes in vessels such as vials, tubes and gradient makers.
Shape | Octagon |
---|---|
Color | White |
Material | Alnico Magnet |
Certifications/Compliance | FDA, USP Class VI, ISO 9001:2008 |
Autoclavable | Yes |
Shape | Cross |
---|---|
Color | White |
Quantity | 50 |
Material | Alnico Magnet |
Certifications/Compliance | FDA |
Bel-Art™ SP Scienceware™ Spinpak™ Magnetic Stirring Bars
Provide instant availability of highly popular octagon shaped bars
Diameter (English) | 0.31 in. |
---|---|
Shape | Octagon |
Diameter (Metric) | 8 mm |
Quantity | 20 |
Material | Alnico Magnet |
Certifications/Compliance | FDA |
Bel-Art™ SP Scienceware™ Egg-Shaped Spinbar™ Magnetic Stir Bars
Designed for use in round-bottom vessels
Shape | Egg |
---|---|
Color | White |
Quantity | 1 |
Autoclavable | Yes |
Bel-Art™ SP Scienceware™ Spinbar™ Round Magnetic Stirring Bars
Cylindrical magnetic stirring bars offer excellent centering and smooth running characteristics
Shape | Cylinder |
---|---|
Color | White |
Material | Alnico Magnet |
Certifications/Compliance | FDA, USP Class VI, ISO 9001:2008 |
Autoclavable | Yes |