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 ODS-AHG grd 200A 20um 50x20mm
YMC-Pack ODS-A is a high-coverage fully-endcapped C18 phase which exhibits exceptional lot-to-lot reproducibility It is available in three different pore sizes and is suitable for the separation of a wide range of compounds YMC-Pack ODS-A in 120 pore size is used for high performance reversed phase separations It has selectivity for the separation of many organic compounds found in pharmaceutical chemical and biotechnology industries 200 ODS-A offers a unique mix of moderately large pores and high surface area for the analysis of compounds ranging from small organics and pharmaceuticals to moderately-sized proteins
Chemglass Life Sciences Stabilizer Bars, Set of Three, for 15L Bioreactor Stands
Six-inch long bar attaches to legs of 15 liter stands and adds an additional measure of safety to the 15 liter bioreactor.Sold as a set of three.Like-for-like replacement parts for Applikon Biotechnology and Broadley-James brands of bioreactors.Applikon is a registered trademark of Applikon Biotechnology, Inc.Broadley-James and Broadley-James Corporation are registered trademarks of Broadley-James Corporation.
Cole-Parmer Dynalon Polypropylene (PP) Paddled Stir Rod, 9-3/4" L; 10/Pk
Use as a stir rod, policeman, or small spatula. Polypropylene (PP) rod features flat and triangular paddles at opposite ends. Max temperature is 266°F (130°C). Autoclavable.
Ace Glass, Inc. Stirbar, PTFE, octagonal, blue, 38.1mmx8.0mm
38.1mm x 8.0mm blue octagonal PTFE stirbar with pivot ring.
Ace Glass, Inc. Stirbar, PTFE, octagonal, yellow, 50.8mmx8.0mm
50.8mm x 8.0mm yellow octagonal PTFE stirbar with pivot ring.