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.
Analytical Sales & Services Stir Bars, Parylene Encapsulated Stainless Steel, 96- and 24-Well Compatibility, 1000 units
Introducing Stir Bars, designed for photoredox and parallel synthesis reaction block systems, which enhance mixing in high-throughput experimentation (HTE). These stir bars are made of parylene encapsulated stainless steel, allowing magnetic stirring functionality while remaining non-magnetic themselves. The unique cylinder shape and precise dimensions enable compatibility with 96- and 24-well configurations, making them an ideal choice for efficient chemical reactions and experiments.
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
Azzota Corp Magnetic Stirring Bars - L Type, 10mm, 15mm, 30mm, 35mm, 40mm Length, 5 In 1 Pk
Magnetic stirring Bars - L type, 10mm, 15mm, 30mm, 35mm, 40mm length, 5 in 1 PK
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.
Uline Steel Ratchet Load Bar With Hoops - Rubber Ends, 87-119"
Steel Ratchet Load Bar With Hoops-Rubber Ends 87-119IN
GA International Destructible Cryogenic Labels for Vials & Containers 1.625" x 0.625" / 41.3mm x 15.9mm Rectangle White From -196°C to +100°C (-321°F to +212°F)
Destructible labels, designed for the secure identification of cryo vials, microtubes, and other containers. This includes cardboard and cryo boxes, plates, vials, and where visible evidence of label tampering is required, such as in pharmaceutical applications. Once adhered to the surface, the labels cannot be removed without being destroyed and broken into small pieces. These cryogenic labels will withstand prolonged storage in laboratory freezers, transport on dry ice, and thawing in water baths. Can be printed with thermal-transfer printers or handwritten with our permanent cryogenic markers.
Sigma Aldrich Fine Chemicals Biosciences SpinbarR disposable magnet
for single-use application where efficiency and cross-contamination are a concern. Alnico V magnet.
Electron Microscopy Sciences Glass Rods, 250 mm Long
Useful tool for all laboratories needs to stir / mix substances. Glass rods are 5 mm diameter.