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.
Research Products International Corp Octagon Magnetic Stirring Bar, 1 x 5/16 Inches, 1 each
Octagon magnetic stirring bars with integral pivot ring are the most commonly used shape. Alnico magnet are 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.
Chemglass Life Sciences Chemglass Magnetic PTFE Stir Bar, Turbo Rare-Earth, Elliptical, 15 x 10 mm
Chemglass magnetic PTFE stir bar with a rare-earth turbo magnet and an elliptical (egg-shaped) profile. It provides exceptional magnetic coupling with near-total resistance to demagnetization and is identified by an inert carbon black spot. Made in the United Kingdom.
- PTFE construction.
- Rare-earth turbo magnet for exceptional magnetic strength.
- Dimensions: 15 x 10 mm.
- Elliptical (egg-shaped) profile.
- Identified by inert carbon black spot.
- Exceptional resistance to demagnetization.
- Made in the United Kingdom.
Chemglass Life Sciences Chemglass Stir Bar, Magnetic, PTFE, Turbo Rare-Earth Elliptical, 10 x 6 mm, for magnetic stirrers
Chemglass CG-2005T-01 is a PTFE-coated turbo (elliptical) magnetic stir bar with a rare-earth magnet. It measures 10 x 6 mm and is designed for use with laboratory magnetic stirrers for mixing and agitation.
- Dimensions: 10 x 6 mm.
- Material: PTFE.
- Shape: Elliptical (turbo).
- Magnet type: Rare-earth magnet.
- Pack quantity: Each.
- Intended use: For magnetic stirring and laboratory mixing.
Sigma Aldrich Fine Chemicals Biosciences Rare earth extra power stir bars Elliptical, diam. 14 mm, L 25 mm | 3EA
Rare earth extra power stir bars Elliptical, diam. 14 mm, L 25 mm | 3EA
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.
Grainger Food Bar 54 1/2 in H Brown
The Grainger 14D244 is a 14-inch diameter, two-blade, aluminum paddle fan with an oil-rubbed bronze finish for durability. It features reversible blades that allow for downdraft and updraft airflow. This 44-inch long fan operates at low noise levels and is ideal for indoor settings like bedrooms, living rooms, and offices. It comes with a 4.5 amp motor, steel motor housing, and 6-inch downrod. The fan provides efficient air circulation and requires standard ceiling fan installation. Overall, the 14D244 is a stylish, energy-efficient paddle fan perfect for circulating air in indoor residential and commercial spaces.
Grainger Tabletop Buffet Bar 44 in L Black
The Carlisle Tabletop Buffet Bar is a 44 inch long buffet server made of stainless steel. It features two shelves for food display and storage and includes two stemware holders. The buffet bar has a modern style design with square tubing legs. It can be used for catering events, home entertaining, or in commercial food service operations. The buffet bar is NSF certified, easy to clean, and made in the USA.
Hach Company Stir Bar-Magnetic
For stirring in extremely small containers Length 3 81 cm (1 5in ) diameter 0 79 cm (0 31in ) Bel-Art