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.
Chemglass Life Sciences Stir Bar, Magnetic, Triangular, PTFE, 50mm L X 12mm Diameter
Stir Bar, Magnetic, Triangular, PTFE, 50mm L X 12mm Diameter. Effective for dissolving solids and mixing sediments in a flat bottom container such as a beaker or Erlenmeyer flask. Manufactured with FDA-grade and USP Class VI PTFE.
Azzota Corp Magnetic Stirring Bars - L Type, 15mm Length, Dia. 7mm
Magnetic stirring Bars - L type, 15mm length, Dia. 7mm
Essendant Smead Flip Top File Box, Letter Files, 13 x 3.7 x 10, Charcoal
Subtle and sophisticated storage the Smead Flip Top File Box provides efficient upright organization with a refined touch Featuring an attached protective lid and a gold metal nameplate for easy labeling and identification it makes an excellent organizational solution Keep loose items tidy on your desk counter or shelf while adding decorative neutral accents to your space Perfect for desk counter or shelf use its sleek design adds elevated organization to any office or home Pair multiple boxes side-by-side for a cohesive clutter-free look that is as practical as it is chic Box Type- File Storage Box Style- Flip Top Strength- Standard-Duty Interior Volume Capacity- 0 26 cu ft
Spectrum Pharma Quip Specialties Inc S BAR OCT 1/2 X3 100/CS
SPECTRUM PHARMA-QUIP SPECIALITES STIR BAR, OCTAGONAL, (13MM X 75MM), 1/2 in. X 3 in. 100/CS
Uline 3M4658F 1/2X27 CLEAR DBL SIDE
3M4658F 1/2X27 CLEAR DBL SIDE TP Tape and Adhesives 4 rolls/case
GA International Cryogenic Thermal-Transfer Labels for Metal Racks 1.625" x 0.625" / 41.3mm x 15.9mm Rectangle White From -196°C to +100°C (-320.8°F to +212°F)
Cryogenic labels for identification of metal surfaces in liquid nitrogen Dewars, such as aluminum cryogenic vial canes, metal racks for cryo and freezer boxes, as well as aluminum cassettes and metal sleeves. Specifically designed for easy marking and identification inside Dewar-type liquid-nitrogen tanks and laboratory freezers. These specialty labels are made from a cryogenic material that has been tested and approved for applying to stainless steel and aluminum with subsequent immersion and storage inside liquid phase and vapor phase liquid nitrogen. These MetaliTAG™ cryo labels can be printed with all major brands of thermal-transfer printers and can be provided in different colors and configurations upon request.