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
Cowie Technology Corporation OCTAHEDRAL STIR 15MM L 8MM D
This item has a minimum order quantity of 112 per supplier requirements. Stirbar, octahedral, length 15 mm, diameter 8 mm
Ace Glass, Inc. Stirbar, PTFE, octagonal, blue, 15.9mmx8.0mm
Stirbar, PTFE, octagonal, blue, 15.9mmx8.0mm
MSC Quantum Storage Plastic Drawer Bin, Red, High-Impact Polystyrene, 28 Lb Capacity
This plastic drawer bin is constructed from high-impact polystyrene, offering durability and resistance to oil and chemicals. Designed for efficient organization, it features a full-width back ledge and a smooth front curved pull handle, making it suitable for use with open and closed shelf units and pick racks. It boasts a 28 lb capacity and is waterproof, ensuring contents are protected.
- Waterproof
- Full width back ledge
- Front handle has 3/4 inch opening
- Oil and chemical resistant
- Smooth front curved pull handle
- For use with open and closed shelf units and pick racks
- High-impact polystyrene material
- 28 lb capacity
- Rectangle shape
Cowie Technology Corporation HUB STIRBAR 45MM L 27MM D
This item has a minimum qty of 17 per supplier requirements.
Stirbar, hub, length 45 mm, diameter 27 mm
Cowie Technology Corporation Stirbar, octahedral, length 38 mm, diameter 8 mm
Stirbar, octahedral, length 38 mm, diameter 8 mm
Cowie Technology Corporation MICRO STIRBAR 15MM L 1.5MM D
This item has a minimum order quantity of 75 per supplier requirements. Stirbar, micro, length 15 mm, diameter 1.5 mm