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.
YMC America, Inc YMCbasic guard 5um 10x5mm
YMCbasic is a unique reversed-phase column designed for analysis of pharmaceuticals and basic compounds Innovative silica synthesis and state-of-the-art silane bonding result in a chromatographic material with neutral silanols This minimizes interactions with both basic and acidic compounds
Chemglass Life Sciences Stabilizer Bars, Set of Three, for 5-7L Bioreactor Stands
Bars attach to the legs of bioreactor stands with two adjustable hex head screws and add an additional measure of safety.For use with both jacketed and unjacketed bioreactor stands.Each bar has silicone pads on the ends for cushioning and added extra grip.Sold as a set of three. 1-3L stabilizer bars are 4” long5-7 stabilizer bars are 4” long15L stabilizer bars are 6” long
Sigma Aldrich Fine Chemicals Biosciences BRAND MAGNTC STIRBAR OVAL 15MM
NC3369713 BRAND MAGNTC STIRBAR OVAL 15MM
Foxx Life Sciences Magnetic Stir Bar Mixer, 55mm Length, 8mm Diameter, Double Ended Dumbell Shape
257-1101-OEM: Magnetic Mixer, Double Ended, 8mm Diameter, 55mm Long. Foxx Life Sciences Magnetic Mixers are used to mix components in order to obtain a homogeneous liquid mixtures. Our mixers can be used in a variety of applications including but not limited to chemistry and biology experiments, buffer solutions, and bacterial growth media. Foxx magnetic mixers are ideal for mixing over a long period of time. Since our mixers are just magnet bars, they can easily be cleaned and the risks of contaminating the solution can be minimized.