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.
Electron Microscopy Sciences Mini Magnetic Stirrer, 1/EA
Mini Magnetic Stirrer is an economical stirrer with a optimal magnetic coupling that ensures dependable stirring efficiency. The powerful magnet coupling to a high-quality stir bar and the unit ensures consistent accurate alignment which significantly reduces spin-outs during acceleration or deceleration of spin speeds and ensure maximum stirring performance. The mini stirrer is made from an ABS and PC blend that is chemical resistant and easy to clean. The low-profile design is lightweight for transporting and the small footprint saves space on a bench top. The mini stirrer offers quiet operation with low vibration. It is deal for routine stirring applications in general research, life science, industrial, quality analysis, and clinical lab settings. 2 High quality stir bars (35 x 9 mm) are included to ensure maximum stirring performance. Color: Gray/Blue.
Electron Microscopy Sciences Micro Stir Bars, 1.5 x 8 mm
Coated with "PTFE" white resin. For stirring test tubes, micro-beakers, and more.
Size: 1/16 x 5/16"
Cowie Technology Corporation OCTAHEDRAL STIR 22MM L 8MM D
This item has a minimum order quantity of 115 per supplier requirements. Stirbar, octahedral, length 22 mm, diameter 8 mm
Sigma Aldrich Fine Chemicals Biosciences SpinbarR disposable magnet
for single-use application where efficiency and cross-contamination are a concern. Alnico V magnet.
Foxx Life Sciences Borosil® Reusable Solid Stirring Rods, Polished Glass Stirrers, 7mm x 150mm (Short 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 available 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.
Andwin Scientific STIR STICKS 12" 100/PK
Perfect Stix 12" Wooden Paint Paddle Stirrer Sticks Length (Pack of 100)
Electron Microscopy Sciences Mini Mixer
Perfect for mixing in test tubes, micro centrifuge tubes and other containers which are too narrow for conventional mixers. The stirring rod will also flare out for use in larger spaces. It comes with a clear vinyl carrying case, 4 1/2"x 1/4"stirring rod, and two "AA" batteries.
Ace Glass, Inc. PTFE multi-paddle agitator, 76mm diameter
76mm diameter PTFE multi-paddle agitator for 10mm OD drilled or knob type shafts. Paddles are replaceable.
Electron Microscopy Sciences Stirring Rod Solid PTFE Rod, 100 mm, 8 mm diameter
PTFE solid rod with tapered end, rods are inert and will not scratch. Use up to 280 deg C.
OAL: 100 mm
Rod: 8 mm
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.
Chemglass Life Sciences Agitator, PTFE, High Viscosity, 5in Diameter, Fits 19mm Shaft Size, Fits 2L-5L Reactors
Agitator, PTFE, High Viscosity, 5in Diameter, Fits 19mm Shaft Size, Fits 2L-3L Reactors. High viscosity agitator, made entirely of PTFE and glass filled PTFE, provides excellent stirring at the bottom of 2L through 3L reactors, especially when heavy slurries are being mixed. Agitator attaches to stir shaft by both a compression fitting and a glass filled PTFE safety pin. Heavy duty blades are 7mm thick. Supplied complete with one glass filled PTFE safety pin.
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