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.
Electron Microscopy Sciences KOMET™ Spinbar Stirring Bar
The "PTFE" Komet Spinbar Magnetic Stirring Bar is made from a high-energetic magnetic material. That, combined with its octagonal shape, produce exceptional power although its length is only 50 mm (1.969" with a 21 mm (.827") diameter. The Samarium-Cobalt magnet is encapsulated in "PTFE". Its eight edges generate strong turbulence so liquids are thoroughly mixed and its stability is not impaired in vessels with curved bottoms. In addition, the risk of demagnetization caused by external magnetic fields is completely eliminated. Komet transmits torque loads 2 to 3 times larger than those of conventional stirring bars of this length significantly improving efficiency.
Chemglass Life Sciences Chemglass X-Shaped PTFE Magnetic Stir Bar, 10 x 5 mm, Pack of 100 - For Magnetic Stirrers
Chemglass X-shaped PTFE magnetic stir bars (10 x 5 mm) are designed to create a deep vortex and provide stable stirring in laboratory vessels. Supplied bulk-packed in quantities of 100 (P100), these PTFE-coated stir bars are manufactured with FDA-grade, USP Class VI materials and are suitable for routine mixing on magnetic stirrers.
- 10 x 5 mm (diameter x height)
- PTFE construction, FDA-grade and USP Class VI
- X-shaped design creates a deep vortex and improves stability during stirring
- Bulk packed - 100 per pack (P100)
- Designed for use with magnetic stirrers
Chemglass Life Sciences Chemglass X-Shaped PTFE Magnetic Stir Bar, 20 x 8 mm, Pack of 100
Chemglass X-shaped PTFE magnetic stir bars are bulk-packed stir bars designed for use with laboratory magnetic stirrers. Each bar measures 20 x 8 mm; the pack contains 100 pieces for bulk laboratory use.
- Ptfe construction provides chemical resistance and broad solvent compatibility.
- X-shaped profile creates a deep vortex and provides stability during stirring.
- 20 x 8 mm size is suitable for small to medium vessels.
- Pack of 100 supplies laboratories with a bulk quantity for routine use.
- White color allows easy visibility in clear solutions.
Chemglass Life Sciences Stir Bar, Micro, Magnetic, PTFE, Length x Dia. in mm: 6.35 x 3
Stir Bar, Micro, Magnetic, PTFE, Length x Dia. in mm: 6.35 x 3. Micro PTFE stir bar for the very smallest containers. Manufactured with FDA-grade and USP Class VI PTFE.SEE CG-2003-50 FOR STIR BAR KIT
Chemglass Life Sciences 10mm PTFE Stirrer Bearing, 24/40, #018 Body O-Ring, #013 Bushing O-Ring
Grease-Free PTFE stirrer bearing for use under moderate vacuum. The bearing consists of a PTFE standard taper body, PEEK (Polyetheretherketone) compression cap, PTFE Insert/bushing and a Nylon loosening nut. The PTFE insert/bushing provides only glass and PTFE contact with the reaction. Loosening nut above the standard taper inner joint allows easy and quick removal. Supplied complete with a Perfluoro o-ring on the body and a Viton o-ring on the bushing.
BIG SCIENCE INC GIANT PLAIN STIR BAR 6IN 1IN D
Giant Plain Stir bar: Length 159 mm (6 inches), Diameter 27 mm (1 inch)
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 25.4 x 9.52, Length x Dia. in inches: 1 x 3/8
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 25.4 x 9.52, Length x Dia. in inches: 1 x 3/8. Octagon cross-section having a molded-in pivot ring manufactured with FDA-grade and USP Class VI PTFE. The PTFE coated Alnico magnet permits magnetic agitation without contamination.SEE CG-2001-50 FOR STIR BAR KIT
Cowie Technology Corporation OCTAHEDRAL STIR 25MM L 8MM D
This item has a minimum order quantity of 105 per supplier requirements. Stirbar, octahedral, length 25 mm, diameter 8 mm
Cowie Technology Corporation OCTAHEDRAL STIR 64MM L 10MM D
This item has a minimum qty of 32 per supplier requirements.
Stirbar, octahedral, length 64 mm, diameter 10 mm
Chemglass Life Sciences Stir Bar, Magnetic, "X" Shaped, PTFE, 30 x 10: Diameter x Height (mm)
Stir Bar, Magnetic, "X" Shaped, PTFE, 30 x 10: Diameter x Height (mm). Shape of stir bar creates a deep vortex and provides stability during stirring. Manufactured with FDA-grade and USP Class VI PTFE.
Cowie Technology Corporation Stirbar, octahedral, length 75 mm, diameter 13 mm
Stirbar, octahedral, length 75 mm, diameter 13 mm
Cowie Technology Corporation OCTAHEDRAL STIR 25MM L 10MM D
This item has a minimum order quantity of 100 per supplier requirements. Stirbar, octahedral, length 25 mm, diameter 10 mm
Cowie Technology Corporation OCTAHEDRAL STIR 51MM L 8MM D
This item has a minimum qty of 49 per supplier requirements.
Stirbar, octahedral, length 51 mm, diameter 8 mm
Cowie Technology Corporation OCTAHEDRAL STIR 13MM L 10MM D
This item has a minimum order quantity of 134 per supplier requirements. Stirbar, octahedral, length 13 mm, diameter 10 mm
Cowie Technology Corporation OCTAHEDRAL STIR 22MM L 8MM D
This item has a minimum qty of 49 per supplier requirements.
Stirbar, octahedral, length 22 mm, diameter 8 mm