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 Plain PTFE Magnetic Stirring Bar, 50 x 8 mm, for Magnetic Stirrers
Plain PTFE-coated magnetic stirring bar (50 x 8 mm) for general-purpose laboratory mixing on magnetic stir plates. Its cylindrical plain profile provides effective agitation and produces increased turbulence at low speeds, while the PTFE coating offers chemical resistance and a non-stick surface.
- Plain cylindrical shape for general-purpose stirring.
- Dimensions: 50 x 8 mm.
- PTFE coating provides chemical resistance and non-stick surface.
- Produces increased turbulence at low stirrer speeds.
- Compatible with standard magnetic stir plates and laboratory mixers.
- Sold individually for easy replacement.
Cole-Parmer Egg-Shaped Stir Bar, 2-1/2" L x 3/4" Dia; 1/Pk
Egg-shaped stir bars have oval magnets—ideal for use in round-bottom flasks. Shape conforms to flask bottom and ensures complete mixing.
Cole-Parmer Tektronix GLASS STIRRING RODS (1 DOZ)
Select from an assortment of accessories to keep you Gel Time Meter in good operation.
Cole-Parmer DWK Life Sciences (Kimble) Stir Rod, Glass, 6.4 mm dia X 250 mm L, 25/pk
Manufactured with borosilicate glass with rounded annealed ends. Stir rods are highly chemical resistant and withstands temperatures to 400° F (205°)C. Autoclavable.
Chrono Log Corporation STIR BAR F/312 SILICONZD 144PK
This item has a minimum qty of 2 per supplier requirements.
Stir bar, disposable siliconized for cuvettes ,AGGREGOMETER SUPPLIES
Chemglass Life Sciences Chemglass Plain PTFE Magnetic Stir Bar, 80 x 10 mm
Plain PTFE magnetic stir bar for use with laboratory magnetic stir plates. The smooth cylindrical profile provides consistent mixing and helps reduce vortexing across a range of vessel sizes. The PTFE coating offers chemical resistance and easy cleaning, while the encapsulated magnetic core ensures reliable coupling to stir plates.
- Made from PTFE for broad chemical resistance.
- Plain cylindrical profile for consistent mixing.
- Encapsulated magnetic core for reliable coupling to stir plates.
- Dimensions: 80 x 10 mm (length x diameter).
- Sold individually (each).
- Suitable for routine laboratory stirring and agitation.
V&P Scientific Inc STIR ELEMENT, CYLINDER, NdFeB Magnet, 42MGO, PEEK Encapsulated, Used in Bottles, Tubes/Vials, 10/pack
STIR ELEMENT, CYLINDER, NdFeB Magnet, 42MGO, PEEK Encapsulated, 11.5mm Diameter, 23.1mm Length, 150°C Max Operating Temp for Magnets
Electron Microscopy Sciences Veco Parallel Bar w/ Divider Handle R200D, Nickel
Veco Grids offer superior handling characteristics. Plus, with a 0.8 mil thickness, Veco Grids are the most rigid grids available. 3.05 mm diameter and 0.8 mil thickness.
Material: Nickel
Pitch: 125 µm
Hole: 85 µm
Bar: 40 µm
Electron Microscopy Sciences Veco Parallel Bar with Handle Grid R300, Copper
Veco Grids offer superior handling characteristics. Plus, with a 0.8 mil thickness, Veco Grids are the most rigid grids available. 3.05 mm diameter.
Material: Copper
Pitch: 85 µm
Hole: 45 µm
Bar: 38 µm
Cowie Technology Corporation MICRO STIRBAR 3MM L 3MM D
This item has a minimum order quantity of 96 per supplier requirements. Stirbar, micro, length 3 mm, diameter 3 mm
Cowie Technology Corporation MICRO STIRBAR 3MM L 3MM D
This item has a minimum order quantity of 96 per supplier requirements. Stirbar, micro, length 3 mm, diameter 3 mm
Cowie Technology Corporation OVAL STIRBAR 70MM L 27MM D
This item has a minimum qty of 8 per supplier requirements.
Stirbar, oval, length 70 mm, diameter 27 mm.
Cowie Technology Corporation MICRO STIRBAR 10MM L 3MM D
This item has a minimum order quantity of 173 per supplier requirements. Stirbar, micro, length 10 mm, diameter 3 mm