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.
Cowie Technology Corporation REMOVABLE RING STIR L25MM D8MM
This item has a minimum qty of 47 per supplier requirements.
Stirbar, removable ring, length 25 mm, diameter 8 mm
Cowie Technology Corporation REMOVABLE RINGSTIRL127MMD16MM
This item has a minimum qty of 7 per supplier requirements.
Stirbar, removable ring, length 127 mm, diameter 16 mm
MSC Industrial Magnetics, Inc. Lift Magnet, 220 lb Capacity, Permanent
This permanent magnet lift is designed for lifting round and curved surfaces such as shafts, thick-walled pipe, or billet, with the ability to also handle flat materials. It features specially designed pole shoes that provide a deep penetrating magnetic field and part stability, offering a 220 lb working load limit.
- On/off rare earth permanent magnet
- Handle requires only 90 degree rotation and locks at both on/off positions
- Durable, recessed metal nameplates
- Corrosion-resistant, plated magnet surface
- Heat resistant up to 180°F (82°C)
- 3:1 design factor
- Meets ASME B30.20 BTH-1 Design Category B, Service Class 3
Ace Glass, Inc. Stirbar, PTFE, octagonal, blue, 38.1mmx8.0mm
38.1mm x 8.0mm blue octagonal PTFE stirbar with pivot ring.
Ace Glass, Inc. Stirbar, PTFE, octagonal, yellow, 15.9mmx8.0mm
15.9mm x 8.0mm yellow octagonal PTFE stirbar with pivot ring.
Ace Glass, Inc. Stirbar, PTFE, egg shape, 50.8mmx19.1mm
50.8mm x 19.1mm egg-shaped PTFE magnetic stir bar which provides a pivot point without a separate ring or abrupt change in contour. Designed to be used with round bottom flasks and DynaBlocs.
Chemglass Life Sciences Chemglass Stirring Bar, Plain PTFE Magnetic, 30 x 6 mm, for Magnetic Stirrers
The Chemglass Stirring Bar (plain) is a PTFE-coated magnetic stir bar sized 30 x 6 mm, designed for reliable mixing in laboratory vessels. Its plain profile creates more turbulence compared with cylindrical bars at low speeds, improving mixing efficiency on magnetic stir plates.
- PTFE construction provides chemical resistance and temperature stability.
- Plain shape increases turbulence at low stirring speeds.
- Dimensions: 30 x 6 mm, suitable for small-to-medium vessels.
- Magnetic core for use with magnetic stir plates.
- Sold individually (each).
Yamato Scientific America, Inc. Yamato Laboratory Stirrer, Max speed of 300 rpm for high viscosity samples. Complete with stand and rod, stirring shaft and 4-blade propeller. 100V-125V
Laboratory stirrer with higher torque for high viscosity samples. Highly sensitive feedback system keeps the set speed, even with changing viscosity during stir. Maintenance free DC brushless motor. Digital speed indicator for accurate speed setting and confirmation. Noise prevention measures for optimal work environment. More safety-oriented design. Set includes stand, rod, stainless steel shaft and 60mm 4-blade propeller. Speed range 10~300 rpm.
Ace Glass, Inc. Stirbar, PTFE, octagonal, 63.5mmx8.0mm
63.5mm X 8.0mm PTFE, octagonal stirbar with pivot ring in center.
Ace Glass, Inc. Stirbar, PTFE, round with x top, 10mmdia x 8mmh
Stirbar, PTFE, round with x top, 10mmdia x 8mmh