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, Egg-shaped, fits 12000mL-22000mL flask, Length x Dia. in inches: 3 x 3/4
Stir Bar, Magnetic, Egg-shaped, fits 12000mL-22000mL flask, Length x Dia. in inches: 3 x 3/4. Egg-shaped magnetic stirring bar provides its own pivot point without separate ring or abrupt change in contour. Designed for use in round bottom vessels, it is shaped to spin freely, unrestricted by the vessel contour. Manufactured with FDA-grade and USP Class VI PTFE.SEE CG-2005-20 FOR STIR BAR KIT
Fireflysci P69 Mixer for 10mm Macro Cuvettes (Type 1, Type 3)
Manual mixer fits any standard 10mm pathlength cuveette with a 10mm inside width• Made of clear acrylic with a straight handle, this tool is used when reactives are performed directly into cuvettes to mix added reagents. Up and down motion in cell provides complete mixing• Shaft diameter- 3.17mm (0.125 inches)
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, "V" Shaped, 9mm Height x 5.5mm Diameter
Stir Bar, Magnetic, PTFE, "V" Shaped, 9mm Height x 5.5mm Diameter. "V" Shaped PTFE magnetic stir bar. Design permits rotation in small test tubes and conical vessels such as MW-80 reaction vials. Manufactured with FDA-grade and USP Class VI PTFE.
Health Care Logistics Inc GLASS STIRRING ROD 12IN 3PK
Rounded ends for safety. Use as a general mixer and stirrer. 12" Length. Three rods per package.
Enterprise Technology Solutions Kimberly-Clark Professional Towels,C-Fold,Low Wet Strength,10.1"x13.15",200/PK,12/CT,WE
Scott Essential provides reliable balance of efficiency, performance and value. When your transportation restroom needs commercial paper towels, Scott Essential C-Fold Paper Towels are a cost-effective choice. They feature a low wet-strength for environments without traditional plumbing such as airplane, train and bus restrooms. FSC-certified, EcoLogo-certified paper towels meet EPA minimum guidelines for post-consumer waste.
Andwin Scientific STIR STICKS 12" 100/PK
Perfect Stix 12" Wooden Paint Paddle Stirrer Sticks Length (Pack of 100)
V&P Scientific Inc STIR ELEMENT, CYLINDER, NdFeB Magnet, 52MGO, PEEK Encapsulated, Used in Bottles, 10/pack
STIR ELEMENT, CYLINDER, NdFeB Magnet, 52MGO, PEEK Encapsulated, 11.5mm Diameter, 48.2mm Length, 80°C Max Operating Temp for Magnets
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, "V" Shaped, 16mm Height x 10mm Diameter
Stir Bar, Magnetic, PTFE, "V" Shaped, 16mm Height x 10mm Diameter. "V" Shaped PTFE magnetic stir bar. Design permits rotation in small test tubes and conical vessels such as MW-80 reaction vials. Manufactured with FDA-grade and USP Class VI PTFE.