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 Veco Parallel Bar w/ Divider Handle R200D, Nickel
Veco Grids offer superior handling characteristics. Plus, with a 0.8 mil thickness, Veco Grids are the most rigid grids available. 3.05 mm diameter and 0.8 mil thickness.
Material: Nickel
Pitch: 125 µm
Hole: 85 µm
Bar: 40 µm
Chemglass Life Sciences Chemglass Stir Bar Retriever, PTFE, 350 x 10 mm (CG-2015T-03)
PTFE stir bar retriever designed to safely recover magnetic stir bars from reaction vessels and laboratory glassware. Molded in pure, FDA-approved PTFE for chemical inertness, the retriever is autoclavable and fitted with a strong magnetic tip for reliable pickup.
- Material: PTFE.
- Length: 350 mm.
- Diameter: 10 mm.
- Magnet options: Alnico V or rare earth.
- Autoclavable for laboratory sterilization.
- Designed for retrieval of magnetic stir bars from vessels.
Azzota Corp Magnetic Stirring Bars - Z Type, 20mm Length, Dia. 6mm
Magnetic stirring Bars - Z type, 20mm length, Dia. 6mm
Azzota Corp Magnetic Stirring Bar- L Type, 40mm Length, Dia. 15mm
Magnetic stirring Bar- L type, 40mm length, Dia. 15mm
Azzota Corp Magnetic Stirring Bars - Z Type, 6mm Length, Dia. 5mm
Magnetic stirring Bars - Z type, 6mm length, Dia. 5mm
Electron Microscopy Sciences Spinbar Circulus™ Dumbbell Stiriing Bar 32mm Blue
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: Blue
Electron Microscopy Sciences KOMET™ Spinbar Stirring Bar
The "PTFE" Komet Spinbar Magnetic Stirring Bar is made from a high-energetic magnetic material. That, combined with its octagonal shape, produce exceptional power although its length is only 50 mm (1.969" with a 21 mm (.827") diameter. The Samarium-Cobalt magnet is encapsulated in "PTFE". Its eight edges generate strong turbulence so liquids are thoroughly mixed and its stability is not impaired in vessels with curved bottoms. In addition, the risk of demagnetization caused by external magnetic fields is completely eliminated. Komet transmits torque loads 2 to 3 times larger than those of conventional stirring bars of this length significantly improving efficiency.
Sigma Aldrich Fine Chemicals Biosciences SpinbarR magnetic stir bar1EA
Leakproof seamless polished and contains a permanent Alnico V magnet. Egg-shape bar is designed especially for use in round-bottom vessels.
Fireflysci P68 Mixer for Semi-Micro Cuvettes (Type 9, Type 9B, Type 9BM, Type 9F, Type 9M)
Manual mixer fits any standard 10mm pathlength cuveette with a 4mm inside width• Made of clear acrylic with a straight handle, this tool is used when reactives are performed directly into cuvettes to mix added reagents. Up and down motion in cell provides complete mixing• Shaft diameter- 3.17mm (0.125 inches)
Chemglass Life Sciences Stir Bar, Magnetic, Egg-shaped, fits 3000mL-5000mL flask, Length x Dia. in inches: 2 1/2 x 3/4
Stir Bar, Magnetic, Egg-shaped, fits 3000mL-5000mL flask, Length x Dia. in inches: 2 1/2 x 3/4. Egg-shaped magnetic stirring bar provides its own pivot point without separate ring or abrupt change in contour. Designed for use in round bottom vessels, it is shaped to spin freely, unrestricted by the vessel contour. Manufactured with FDA-grade and USP Class VI PTFE.SEE CG-2005-20 FOR STIR BAR KIT
Enterprise Technology Solutions Deflecto Mounting Bar, Storage Organizer, 22" L, Gray
Wall-Mounting Bar features an easy-to-use design to make installation fast and simple. Durable aluminum construction is capable of holding up to 40 lb. to keep your supplies in a convenient location. This 22" mounting bar is designed for use with Deflecto Stackable Caddy Organizer Canisters and Interlocking Single Tilt Bins (each not included) to store a variety of essential items in one place.