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.
V&P Scientific Inc STIR ELEMENT, CYLINDER, Stainless Steel, Parylene C Coated, Used in Microplates, Tubes/Vials, 1000/pack
STIR ELEMENT, CYLINDER, Stainless Steel, Parylene C Coated, 2.0mm Diameter, 4.8mm Length, 200°C Max Operating Temp for Coating, Used for Parallel Synthesis/Reaction Optimization, (1000/Pack)
Electron Microscopy Sciences Stirring Rod Solid PTFE Rod, 250 mm, 8 mm diameter
PTFE solid rod with tapered end, rods are inert and will not scratch, use up to 280 deg C.
OAL: 250 mm
Rod: 8 mm
Electron Microscopy Sciences Stirring Rod PTFE with Steel Core, 200 mm, 6 mm diameter
Steel core can be bent into a permanent shape, rods are inert and will not scratch, use up to 280 degree C, rod OD: 6 mm.
OAL: 200 mm
Rod: 6 mm
Chemglass Life Sciences Stir Bar Dual Purpose Positioner/Retriever, Polyethylene, 5/8" Diameter X 12" OAL
Stir Bar Dual Purpose Positioner/Retriever, Polyethylene, 5/8" Diameter X 12" OAL. Convenient dual purpose polyethylene unit permits positioning of the spinbar at the bottom of a vessel without dropping bar into liquid. Also allows bar to be removed without touching or pouring out liquid. Retriever slides within outer casing. To pick up spinbar, slide retriever down; to release bar, slide retriever up. 5/8in in diameter and 12in overall length.
Analytical Sales & Services Well Tray Loaded with Barcoded 8x30 Shell Vials, with 99685 Silicone Cap Mat, and 13258 Stir Bars
Well Tray Loaded with Barcoded 8x30 Shell Vials, with 99685 Silicone Cap Mat, and 13258 Stir Bars
Cowie Technology Corporation MICRO STIRBAR 3MM L 3MM D
This item has a minimum order quantity of 106 per supplier requirements. Stirbar, micro, length 3 mm, diameter 3 mm
PATHOLOGY INNOVATIONS The 20mm Deep Well Bar has four 20mm wells, two that are 6mm deep and two that are 9mm deep, on one-inch thick stainless steel. These bars are stored in the cryostat and serve as a powerful heat sink to rapidly freeze the block.
When using the Peters Precision Cryoembedding System, embedding is performed in wells machined into the face of one-inch thick stainless steel bars offered in various sizes. The 20mm Deep Well Bar has four 20mm wells, two that are 6mm deep and two that are 9mm deep, on one-inch thick stainless steel. These bars are stored in the cryostat and serve as a powerful heat sink to rapidly freeze the block. Add additional well bars like this one to your existing Peters Precision Cryoembedding System. The Peters Precision Cryoembedding System was designed by inventor, professor and author of frozen section literature Dr. Stephen Peters to give users more precision and control when doing a high volume of frozen section procedures. Learn how to use the system as well as advanced frozen section technique at pathologyinnovations.com.
Cowie Technology Corporation OVAL STIRBAR 50MM L 17MM D
This item has a minimum qty of 20 per supplier requirements.
Stirbar, oval, length 50 mm, diameter 17 mm