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
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 |
PTFE Magnetic Stirring Bar
Stirbars designed for stirring small volumes have polygon multifaceted surfaces that add turbulence relative to similar smooth cylindrical bars.
Bel-Art™ SP Scienceware™ PTFE Magnetic Stirring Bar
Stirbars have polygon multifaceted surfaces that add turbulence relative to similar smooth size cylindrical bars.
Bel-Art™ SP Scienceware™ Spinplus™ Magnetic Stirring Bars
Spinplus™ magnetic stirring bars add speed and efficiency to mixing operations
Shape | Cross |
---|---|
Color | White |
Quantity | 50 |
Material | Alnico Magnet |
Certifications/Compliance | FDA, USP Class VI, ISO 9001:2008 |
Autoclavable | Yes |
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™ 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™ Polypropylene Policeman
Each round a rod has one end flattened and cut diagonally
SP Bel-Art™ Elliptical Magnetic Stirring Bar Spinbar™
For round bottom flasks. Used in conjunction with a magnetic stirring plate, create uniform, consistent, and thorough mixing of chemical solutions
Shape | Elliptical |
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Bel-Art™ SP Scienceware™ Cell Spinbar™ Stir Bar for Spectrophotometer Cells
For 10mm lightpath spectrophotometer cells
SP Bel-Art™ Metric Color Octagon Spinbar Magnetic Stirring Bars
Interrupted profile provides greater surface area and added turbulence when compared to the smooth surface of cylindrical bars
Material | PTFE |
---|---|
Coating | PTFE, FDA-grade, USP Class VI |
Autoclavable | Autoclavable |
SP Bel-Art™ Metric Elliptical (Egg-Shaped) Spinbar Magnetic Stirring Bars
Used in conjunction with a magnetic stirring plate, Spinbar™ stir bars create uniform, consistent, and thorough mixing of chemical solutions. Perfect for Round Bottom Flasks
Color | White |
---|---|
Material | PTFE |
Coating | PTFE, FDA-grade, USP Class VI |
Autoclavable | Autoclavable |
SP Bel-Art™ Polygon Magnetic Stirring Bar Spinbar™
Scrapes solids from vessel bottom. High quality PTFE encapsulated magnetic stirring bars ensure efficient mixing with consistent results.
Shape | Polygon |
---|---|
Quantity | 10/Pk. |
Bel-Art™ SP Scienceware™ Spinbar Octagon Magnetic Stir Bar
Octagon magnetic stirring bar with integral pivot ring are the most commonly used shape..
Bel-Art™ SP Scienceware™ Borosilicate Glass Round Spinbar™ Magnetic Stir Bars
Useful for high temperature applications up to 274°C (525°F)
Shape | Sphere |
---|---|
Color | Clear |
Quantity | 1 |
Certifications/Compliance | USP Type I, ISO 9001:2008 |
Autoclavable | Yes |