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.
Analytical Sales & Services Stir Bars 1.6X4.8MM, Parylene-Encapsulated Stainless Steel, Non-Magnetic, 1000 Units
STIR BARS 1.6X4.8MM 1000CS stir bars are engineered for precise agitation in photoredox and parallel synthesis systems. Made with durable parylene-encapsulated stainless steel, they are chemical resistant and non-magnetic, ensuring controlled mixing for sensitive applications. Packaged with 1000 units, these stir bars support high-throughput experiments, distinguishing themselves from others with their efficient manipulation by external magnetic forces.
Research Products International Corp Spinbar Magnetic Sink Strainer, Blue
The Spinbar Magnetic Sink Strainer provides an innovative solution to a common laboratory inconvenience. Prevents magnetic stirring bars from accidentally slipping into the drain when cleaning beakers or cylinders. Flexible chemical resistant strainer has four strong magnets that attract and hold stirring bars. The strainer is designed with long slits that allow unobstructed drainage of fluids. Strainer remains securely in place and fits a variety of sinks. Flat edge allows strainer to be placed near the sink wall.
Research Products International Corp Flea Micro Magnetic Stirring Bar, 10 x 3 mm
Micro (Flea) magnetic stirring bars are designed for stirring small volumes in vessels such as vials, tubes and gradient makers. Particularly useful for environmental testing and life science applications in which small sample volumes need to be prepared and evaluated.
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Turbo, Rare Earth, Elliptical, 70 x 28mm
Exceptional strength coupled with almost total resistance to demagnetisation. Identified by an inert carbon black spot.
Foxx Life Sciences Borosil Reusable Solid Stirring Rods, Extra Wide Polished Glass Stirrers, 9mm x 255mm (Large Length), 20/CS
Borosil Polished Glass Solid Stirring Rods are constructed from smooth, low-expansion, low-extractable borosilicate glass. Their mechanical strength, excellent heat resistance, and outstanding chemical compatibility make them the perfect general use stirrer. Borosil Glass Stirrers are avaialble in two widths: 7mm and Extra-Wide 9mm. Each width is Avail. in four lengths, from the Short 150mm to the Extra Large 305mm. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil Glassware is stress-free and incredibly resistant to thermal shock.
Electron Microscopy Sciences 16 Spin Bars Assortment Box
Box contains 16 assorted bars; 12 octagon magnetic stirring bars, PTFE with pivot ring and 4 fleas, 2 each: 7mmx2mm, 10mmx3mm, 1/2"x 5/16", 5/8 "x 5/16", 1"x3/8", 1.5"x 3/8", 2"x 3/8", 2.5"x 3/8".
Electron Microscopy Sciences Micro Stir Bars, 1.5 x 15 mm
Coated with "PTFE" white resin. For stirring test tubes, micro-beakers, and more. Packed 12 bars per box. 1/16 x 9/16 inches; 1.5x15mm
Electron Microscopy Sciences Micro Stir Bars, 3 x 12.7 mm
Coated with "PTFE" white resin. For stirring test tubes, micro-beakers, and more.
Size: 1/8 x 1/2"
V&P Scientific Inc STIR ELEMENT, CYLINDER, Stainless Steel, Passivated, Used in Microplates, Tubes/Vials, 200/pack
STIR ELEMENT, CYLINDER, Stainless Steel, Passivated, 1.9mm Diameter, 4.8mm Length, 600°C Max Operating Temp
Cole-Parmer Micro Stir Bar, 5 mm L x 2 mm Dia; 1/Pk
Strong alnico V magnets with one-piece coating of PTFE.
Research Products International Corp Octagon Magnetic Stirring Bar, 2 x 5/16 Inches, 1 each
Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape. Alnico magnet are encapsulated in FDA Grade, USP Class VI Teflon PTFE low friction coating; durable and inert. The interrupted profile provides greater surface area and added turbulence when compared to the smooth surface of cylindrical bars. Pivot ring aids in reducing friction and chattering. Stirring bars are autoclavable.
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 25.4 x 9.52, Length x Dia. in inches: 1 x 3/8
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 25.4 x 9.52, Length x Dia. in inches: 1 x 3/8. Octagon cross-section having a molded-in pivot ring manufactured with FDA-grade and USP Class VI PTFE. The PTFE coated Alnico magnet permits magnetic agitation without contamination.SEE CG-2001-50 FOR STIR BAR KIT