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.
Electron Microscopy Sciences 24 Color Code Spin Bar Assortment Box
24 color coded octagon magnetic stirring bars: PTFE with pivot ring, consists of 1 each: Yellow, Red And Blue: 1/2"x1/8", 5/8"x 5/16", 7/8"x 5/16", 1/2"x 5/16", 1"x 5/16", 1.5"x 5/16", 2"x 5/16", 3"x1/2".
RENICK LABS LLC Disposable, Parylene-encapsulated stir bars for 8x30mm glass shell vial work, 1000/pk
Need disposable stir bars for use with 8mm glass shell vials? RL 352A stir bars are the perfect size. Parylene is vapor deposited to the surface of every stir bar ensuring the best possible encapsulation and guards against reaction interference. While the vast majority of chemical reactions do not affect the Parylene coating, extended stirring times of heterogeneous mixtures at elevated temperatures, ethereal solvents such as Dioxane and THF may cause degradation.
Research Products International Corp Octagon Magnetic Stirring Bar, 1 1/2x5/16
Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape. Alnico magnet is encapsulated in FDA Grade, USP Class VI Teflon PTFE low friction coating; durable and inert. The interrupted profile provides greater surface area and added turbulence when compared to the smooth surface of cylindrical bars. Pivot ring aids in reducing friction and chattering . Stirring bars are autoclavable.
Biotage Magnetic Stir Bars, for 10-20 mL Microwave Reaction Vial 5/Case
Biotage Magnetic Stir Bars, for 10-20 mL Microwave Reaction Vial 5/Case
Ace Glass, Inc. PTFE banana stir blade, 21x87mm, 500mL flask size, 10mmshafts
21X87MM PTFE STIR BLADE
Sigma Aldrich Fine Chemicals Biosciences BRAND(R) magnetic stirring bar, PTFE, cylindrical L 40 mm, bar diam. 8 mm | 10EA
BRAND(R) magnetic stirring bar, PTFE, cylindrical L 40 mm, bar diam. 8 mm | 10EA
Azzota Corp Magnetic Stirring Bars - L Type, 30mm Length, Dia. 10mm
Magnetic stirring Bars - L type, 30mm length, Dia. 10mm
Perkin Elmer US LLC Magnetic Stirrer Fleas - Qty. 6
The Magnetic Stirrer Fleas, also called stirring beads, are required with the Quartz SUPRASIL Fluorescence Cells for Magnetic Stirrers (B0631132), but they need to be order separately. With this part number, they are also available as a replacement or spare set. Qty. 6 beads per package.
PATHOLOGY INNOVATIONS The Peters Precision Cryoembedding System Medium Well Bar Set comes with one 24 mm well bar, 4 small chucks, 2 over-chuck freezing blocks and 8 dispensing slides.
The Peters Precision Cryoembedding System is a combination of simple techniques and apparatus which allows the user to embed tissues for frozen section with a level of control and predictability that can surpass even paraffin embedding. The Medium Well Bar Set comes with one 24 mm well bar, 4 small chucks, 2 over-chuck freezing blocks and 8 dispensing slides. This system was designed by inventor, professor and author of frozen section literature Dr. Stephen Peters to give users more precision and control when doing a high volume of frozen section procedures. This set is made for outfitting labs that process a high volume of frozen sections with average sized specimen, and a great way to get started using the Peters Precision Cryoembedding System which has been adopted by thousands of hospitals globally. Learn how to use the system as well as advanced frozen section technique at pathologyinnovations.com.
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 12.7 x 9.52, Length x Dia. in inches: 1/2 x 3/8
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 12.7 x 9.52, Length x Dia. in inches: 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
Hach Company Stir Bar 17.2 mm x 10.5 mm - Replacement for 5500sc Analyzers
Replacement stir bar for use with 5500sc analyzers. The bar's compact dimensions match the analyzer sample chamber to provide reliable agitation and consistent mixing for routine analysis.
- Dimensions: 17.2 mm x 10.5 mm.
- Designed to provide consistent mixing in small sample chambers.
- Sold as a spare part for laboratory analyzers.
- Safety Data Sheet (SDS) available from the manufacturer.
Electron Microscopy Sciences Willco-dish Glass Bottom Kit Assembly Device 50x20 mm, 12 mm Glass Aperture
Round, anodized, aluminum “Assembly Devices" for a quick, accurate and safe positioning and assembly of the glass coverslip and the adhesive ring. 50x20 mm.
Aperture: 12 mm