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.
Cowie Technology Corporation MICRO STIRBAR 7MM L 2MM D
This item has a minimum order quantity of 164 per supplier requirements. Stirbar, micro, length 7 mm, diameter 2 mm
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
Cowie Technology Corporation OVAL STIRBAR 70MM L 20MM D
This item has a minimum qty of 11 per supplier requirements.
OVAL STIRBAR 70MM L 20MM D
Cowie Technology Corporation TRIANGULAR STIRBAR L50MM D12MM
This item has a minimum qty of 32 per supplier requirements.
Stirbar, triangular, length 50 mm, diameter 12 mm
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 63.5 x 9.52, Length x Dia. in inches: 2 1/2 x 3/8
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 63.5 x 9.52, Length x Dia. in inches: 2 1/2 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
Cowie Technology Corporation MICRO STIRBAR 5MM L 2MM D
This item has a minimum order quantity of 124 per supplier requirements. Stirbar, micro, length 5 mm, diameter 2 mm
Grainger Adapter Bar 12 3/4 in L 1 in W PK12
The Grainger 14D023 is a Westward 3/8-inch drive deep impact socket set. This 15-piece set includes sizes ranging from 4mm to 14mm as well as a 3-inch extension. The sockets are made from chrome vanadium steel for durability and have a black phosphate finish to resist corrosion. The set comes organized in a molded case for convenient storage and portability. With deep broach design, these impact sockets can be used with power tools in tight spaces. Overall, this is a versatile socket set for automotive and machinery work.
Chemglass Life Sciences Chemglass Plain PTFE Magnetic Stir Bar, 80 x 10 mm
Plain PTFE magnetic stir bar for use with laboratory magnetic stir plates. The smooth cylindrical profile provides consistent mixing and helps reduce vortexing across a range of vessel sizes. The PTFE coating offers chemical resistance and easy cleaning, while the encapsulated magnetic core ensures reliable coupling to stir plates.
- Made from PTFE for broad chemical resistance.
- Plain cylindrical profile for consistent mixing.
- Encapsulated magnetic core for reliable coupling to stir plates.
- Dimensions: 80 x 10 mm (length x diameter).
- Sold individually (each).
- Suitable for routine laboratory stirring and agitation.
Ace Glass, Inc. Stirbar, PTFE, octagonal, red, 76.2mmx12.7mm
Stirbar, PTFE, octagonal, red, 76.2mmx12.7mm
Enterprise Technology Solutions Absorbent Specialty Products Flood Barriers,4 Gallon/32 lb Cap,5'Lx3.5"H,16/CT,Black
Flood Barriers absorb, contain and divert problem floodwater to help protect your property from the dangers of flooding. They activate when wet and require no sand. Each 5' long barrier absorbs 4 gallons of water, swells to 32 lb. and expands to 3.5" high in 10 minutes. This compact, lightweight flood control is quick and easy to deploy. Flexible design conforms to shapes and can also be dragged for easy maneuverability. Inner absorbent turns to gel and creates a barrier. Dual-lobe chamber prevents rolling out of position. Leave in place for ongoing protection. Setup requires no additional tools or supplies. Barriers are safe, nontoxic and nonhazardous. Discard into regular trash when you no longer need them.
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.
Cowie Technology Corporation REMOVABLE RINGSTIRL51MMD10MM
This item has a minimum qty of 27 per supplier requirements.
Stirbar, removable ring, length 51 mm, diameter 10 mm