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.
Cole-Parmer Tektronix GLASS STIRRING RODS (1 DOZ)
Select from an assortment of accessories to keep you Gel Time Meter in good operation.
Analytical Sales & Services 5MMX2MM PTFE STIR BARS 25PK
5mm x 2mm PTFE-coated magnetic stir bars. 25pk
Chemglass Life Sciences X SHAPE 20X8MM STIR BAR 100PK
Stir Bar, Magnetic, "X" Shaped, PTFE, 20 x 8: Diameter x Height (mm), Bulk Packed 100pk
Chemglass Life Sciences Stir Bars, Magnetic, PTFE, Plain
Stirring Bar, Plain, 10 x 6mm, Magnetic, PTFE
Essendant Smead TUFF Expanding Wallet, 21 Sections, Elastic Cord Closure, 1/21-Cut Tabs, Letter Size, Redrope
The quality standard for portable expanding files these heavy-duty tough files feature a handsome and sturdy redrope-printed material Protective flap with elastic cord closure makes it easy to transport the entire file Choose from alphabetic (A-Z) monthly (January-December) or daily (1-31) indexing This heavy-duty file features extra reinforcements and double thick front and back panels for long-lasting durability Each pocket expands to 0 88 Pocket/Wallet Type- Files/Papers Size- Letter Closure Type- Elastic Cord Color(s)- Redrope
Essendant Smead Flip Top File Box, Letter Files, 13 x 3.7 x 10, Saddle
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
Azzota Corp Magnetic Stirring Bars - B Type, 15mm Length, Dia. 7.5mm
Magnetic stirring Bars - B type, 15mm length, Dia. 7.5mm
Azzota Corp Magnetic Stirring Bars - B Type, 25mm Length, Dia. 8mm
Magnetic stirring Bars - B type, 25mm length, Dia. 8mm
Azzota Corp Magnetic Stirring Bar - L Type, 10mm Length, Dia. 6mm
Magnetic stirring Bar - L type, 10mm length, Dia. 6mm
Azzota Corp Magnetic Stirring Bar - H Type, 10mm Length, Dia. 6mm
Magnetic stirring Bar - H type, 10mm length, Dia. 6mm
Azzota Corp Magnetic Stirring Bars - Z Type, 15mm Length, Dia. 5mm
Magnetic stirring Bars - Z type, 15mm length, Dia. 5mm
Foxx Life Sciences Borosil® Reusable Solid Stirring Rods, Polished Glass Stirrers, 7mm x 150mm (Short Length), 20/CS
Borosil® Polished Glass Solid Stirring Rods are constructed from smooth, low-expansion, low-extractable borosilicate glass. Their mechanical strength, excellent heat resistance, and outstanding chemical compatibility make them the perfect general use stirrer. Borosil® Glass Stirrers are avaialble in two widths: 7mm and Extra-Wide 9mm. Each width is available in four lengths, from the Short 150mm to the Extra Large 305mm. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.