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.
Ace Glass, Inc. Stirbar, PTFE, v-vane, fits 3mL and 5mL V-vials with 14/10joints
Stirbar, PTFE, v-vane, fits 3mL and 5mL V-vials with 14/10joints
Cole-Parmer Mono-Mold Standard Stir Bar with Spinning Ring, 3"L x 1/2" dia
Mono-Mold magnetic stir bars are the standard all-purpose stir bar. Available with or without spinning rings; rings reduce contact area between stir bar and vessel, reducing friction and noise.
Chemglass Life Sciences Chemglass Stir Bar, Magnetic, PTFE, Turbo Rare-Earth Elliptical, 10 x 6 mm, for magnetic stirrers
Chemglass CG-2005T-01 is a PTFE-coated turbo (elliptical) magnetic stir bar with a rare-earth magnet. It measures 10 x 6 mm and is designed for use with laboratory magnetic stirrers for mixing and agitation.
- Dimensions: 10 x 6 mm.
- Material: PTFE.
- Shape: Elliptical (turbo).
- Magnet type: Rare-earth magnet.
- Pack quantity: Each.
- Intended use: For magnetic stirring and laboratory mixing.
V&P Scientific Inc STIR ELEMENT, CROSS, AlNiCo Magnet, 5.5MGO, PTFE Encapsulated, Used in Tubes/Vials, 10/pack
STIR ELEMENT, CROSS, AlNiCo Magnet, 5.5MGO, PTFE Encapsulated, 19.0mm Diameter, 8.0mm Height, 260°C Max Operating Temp for Coating
Electron Microscopy Sciences Stirring Rod Solid PTFE Rod, 200 mm, 8 mm diameter
PTFE solid rod with tapered end, rods are inert and will not scratch. Use up to 280 deg C..
OAL: 200 mm
Rod: 8 mm
Electron Microscopy Sciences Stirring Rod Solid PTFE Rod, 150 mm, 8 mm diameter
PTFE solid rod with tapered end, rods are inert and will not scratch. Use up to 280 deg C.
OAL: 150 mm
Rod: 8 mm
Electron Microscopy Sciences Stirring Rod PTFE with Steel Core, 150 mm, 6 mm diameter
Steel core can be bent into a permanent shape, rods are inert and will not scratch, use up to 280 degree C, rod OD: 6 mm.
OAL: 150 mm
Rod: 6 mm
Electron Microscopy Sciences Stirring Rod Solid PTFE Rod, 300 mm, diameter
PTFE solid rod with tapered end, rods are inert and will not scratch. Use up to 280 deg C.
OAL: 300 mm
Sigma Aldrich Fine Chemicals Biosciences Rare earth extra power stir bars oval, diam. 10 mm, L 20 mm | 3EA
Rare earth extra power stir bars oval, diam. 10 mm, L 20 mm | 3EA
Andwin Scientific MICRO STIRRING BAR 2X7MM 12/PK
The 2 x 7 mm. Micro Stirring Bars are coated with "PTFE" white resin. This product is suitable for use with stirring test tubes, micro-beakers, and other laboratory glasswares. It is sold in a pack of 12.
GA International Cryogenic Thermal-Transfer Labels for Metal Racks 1.625" x 0.625" / 41.3mm x 15.9mm Rectangle White From -196°C to +100°C (-320.8°F to +212°F)
Cryogenic labels for identification of metal surfaces in liquid nitrogen Dewars, such as aluminum cryogenic vial canes, metal racks for cryo and freezer boxes, as well as aluminum cassettes and metal sleeves. Specifically designed for easy marking and identification inside Dewar-type liquid-nitrogen tanks and laboratory freezers. These specialty labels are made from a cryogenic material that has been tested and approved for applying to stainless steel and aluminum with subsequent immersion and storage inside liquid phase and vapor phase liquid nitrogen. These MetaliTAG™ cryo labels can be printed with all major brands of thermal-transfer printers and can be provided in different colors and configurations upon request.