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, Glass, Length x Dia. in mm: 22.2 x 6.35, Length x Dia. in inches: 7/8 x 1/4
Stir Bar, Magnetic, Glass, Length x Dia. in mm: 22.2 x 6.35, Length x Dia. in inches: 7/8 x 1/4. Borosilicate covered Alnico magnet for use in high temperature reactions.
MSC US Cargo Control Polyester Ratchet Strap Tie Down, 27 ft, 2 in, Flat Hook
This polyester ratchet strap tie down is designed for securing cargo. It features a durable polyester strap and a flat hook end fitting, providing reliable load securement for various applications.
- Durable polyester strap
- 27 ft length
- 2 in width
- 10000 lb breaking strength
- 3333 lb load capacity
- Flat hook end fitting
- Steel end material
- Green color
- 1 ft fixed end length
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.
Electron Microscopy Sciences Micro Stir Bars, 1.5 x 8 mm
Coated with "PTFE" white resin. For stirring test tubes, micro-beakers, and more.
Size: 1/16 x 5/16"
MSC Unger ErgoTec T-Bar, Polypropylene, Green/Black
The Unger ErgoTec T-Bar is a professional-grade tool designed for efficient and ergonomic window cleaning. It features a durable polypropylene construction, ensuring reliability and comfort for extended use in various cleaning applications.
- Constructed from polypropylene material
- Features a green and black color scheme
- Designed for ergonomic handling
- Available in multiple lengths for varied tasks
Electron Microscopy Sciences Micro Stir Bars, 2 x 7 mm
Coated with "PTFE" white resin. For stirring test tubes, micro-beakers, and more.
Size: 2 x 7 mm
Cole-Parmer Essentials PTFE Stir Bar, Plain, 50 x 8mm
These PTFE stir bars feature a slimmer profile and larger length to diameter ratio.
Sigma Aldrich Fine Chemicals Biosciences SpinbarR disposable magnet
for single-use application where efficiency and cross-contamination are a concern. Alnico V magnet.