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.
MSC Unger ErgoTec T-Bar, Polypropylene, Green/Black
The Unger ErgoTec T-Bar is a professional-grade tool designed for efficient and ergonomic window cleaning. It features a durable polypropylene construction, ensuring reliability and comfort for extended use in various cleaning applications.
- Constructed from polypropylene material
- Features a green and black color scheme
- Designed for ergonomic handling
- Available in multiple lengths for varied tasks
MSC US Cargo Control Polyester Ratchet Strap Tie Down, 27 ft, 2 in, Flat Hook
This polyester ratchet strap tie down is designed for securing cargo. It features a durable polyester strap and a flat hook end fitting, providing reliable load securement for various applications.
- Durable polyester strap
- 27 ft length
- 2 in width
- 10000 lb breaking strength
- 3333 lb load capacity
- Flat hook end fitting
- Steel end material
- Green color
- 1 ft fixed end length
Cole-Parmer AZS4235 Stir Bars, 12 x 4.5 mm; 10/PK
Keep your reaction station running smoothly with these parts and accessories.
Bellco Glass, Inc. PTFE Stirring Bar,82.6mm
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
Cowie Technology Corporation TRIANGULAR STIRBAR L20MM D8MM
This item has a minimum order quantity of 86 per supplier requirements. Stirbar, triangular, length 20 mm, diameter 8 mm
Cowie Technology Corporation OVAL STIRBAR 25MM L 10MM D
This item has a minimum order quantity of 78 per supplier requirements. Stirbar, oval, length 25 mm, diameter 10 mm
Cowie Technology Corporation OVAL STIRBAR 20MM L 10MM D
This item has a minimum order quantity of 91 per supplier requirements. OVAL STIRBAR 20MM L 10MM D
Enterprise Technology Solutions C-Line Binding Bars, 11"x1/4", 100/BX, Black
Binding bars slide onto report covers (sold separately) easily to hold material securely in place. 1/4" size holds up to 40 sheets or small catalogs. Simple design offers versatility when expanding presentations.