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.
Hach Company Stir Bar, Magnetic, Plus Shape, 3/8"
This magnetic stir bar adds speed and efficiency to your mixing requirements. The “+” shape creates a deep vortex and provides stable, quiet operation.
Hach Company Stir Bar, Magnetic, Arrester
Use the Magnetic Stirring Bar Arrester to hold your stirring bar in place when pouring from a beaker or flask.
Hach Company Stir Bar, Magnetic, Plus Shape, 1-1/2"
This magnetic stir bar adds speed and efficiency to your mixing requirements. The “+” shape creates a deep vortex and provides stable, quiet operation.
Essendant Smead Flip Top File Box, Letter Files, 13 x 3.7 x 10, Charcoal
Subtle and sophisticated storage the Smead Flip Top File Box provides efficient upright organization with a refined touch Featuring an attached protective lid and a gold metal nameplate for easy labeling and identification it makes an excellent organizational solution Keep loose items tidy on your desk counter or shelf while adding decorative neutral accents to your space Perfect for desk counter or shelf use its sleek design adds elevated organization to any office or home Pair multiple boxes side-by-side for a cohesive clutter-free look that is as practical as it is chic Box Type- File Storage Box Style- Flip Top Strength- Standard-Duty Interior Volume Capacity- 0 26 cu ft
Chemglass Life Sciences Stir Rod, Glass, 5mm Dia., 6" OAL
Stir Rod, Glass, 5mm Dia., 6" OAL. Manufactured from Type 1 borosilicate glass with rounded ends.
Chemglass Life Sciences Stir Rod, Glass, 1/4" Dia., 10" OAL
Stir Rod, Glass, 1/4" Dia., 10" OAL. Manufactured from Type 1 borosilicate glass with rounded ends.
Azzota Corp Ptfe Magnetic Stir Bar Retriever, Length: 12" (300mm)
PTFE Magnetic Stir Bar Retriever, Length: 12" (300mm)
Electron Microscopy Sciences Spinbar Circulus™ Dumbbell Stiriing Bar 32mm Red
These magnet stirring bars provide strong turbulence at relatively low speeds, offering reduced surface contact and excellent centering characteristics, particularly in vessels with convex bottoms. Ideal for 'problem' liquids, highly viscous mixtures and metal particles in fluid. All sizes have solid PTFE end disks 20 mm (.79”) in diameter. Bar diameter is 8 mm (.315”).
Color: Red
Electron Microscopy Sciences Spinbar Magnetic Sink Strainer, Blue
Just drop in place and prevent magnetic stirring rods from going down the sink. Made from a durable and flexible material. Includes four strong magnets to capture the magnetic stirring bars before they go down the sink drain. Features long slits so fuilds drain easily and rapidly and a wide skirt that can be used with a variety of sink drains. Four legs located on underside anchors the strainer firmly in the sink drain. One size fits most laboratory sinks.
Electron Microscopy Sciences Spinbar Circulus™ Dumbbell Stiriing Bar 52mm White
These magnet stirring bars provide strong turbulence at relatively low speeds, offering reduced surface contact and excellent centering characteristics, particularly in vessels with convex bottoms. Ideal for 'problem' liquids, highly viscous mixtures and metal particles in fluid. All sizes have solid PTFE end disks 20 mm (.79”) in diameter. Bar diameter is 8 mm (.315”).
Color: White
Electron Microscopy Sciences Spinbar Circulus™ Dumbbell Stiriing Bar 52mm Yellow
These magnet stirring bars provide strong turbulence at relatively low speeds, offering reduced surface contact and excellent centering characteristics, particularly in vessels with convex bottoms. Ideal for 'problem' liquids, highly viscous mixtures and metal particles in fluid. All sizes have solid PTFE end disks 20 mm (.79”) in diameter. Bar diameter is 8 mm (.315”).
Color: Yellow
Bellco Glass, Inc. Molded, seamless Teflon construction ideal for procedures using all bellco magnetic stirrers. Excellent for mixing media and buffer solutions. Size: 82.6 x 19mm Case qty: 2
Molded, seamless Teflon construction ideal for procedures using all bellco magnetic stirrers. Excellent for mixing media and buffer solutions. Size: 82.6 x 19mm Case qty: 2
Cole-Parmer AZS4235 Stir Bars, 12 x 4.5 mm; 10/PK
Keep your reaction station running smoothly with these parts and accessories.