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 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
Perkin Elmer US LLC Magnetic Stirrer Fleas - Qty. 6
The Magnetic Stirrer Fleas, also called stirring beads, are required with the Quartz SUPRASIL Fluorescence Cells for Magnetic Stirrers (B0631132), but they need to be order separately. With this part number, they are also available as a replacement or spare set. Qty. 6 beads per package.
Biosurface Technologies Corp Industrial Surfaces Biofilm Reactor with 220V Stir/Hot Plate, Low- to Mid-Shear Laboratory Biofilm Growth Device, BioSurface Technologies Corporation.
"The Industrial Surfaces Biofilm Reactor (ISBR) is a bench-top biofilm growth chamber designed to provide a growth environment for biofilm under low shear, high gas transfer, and intermittent wetting. The sample slides are intermittently wetted via a fluid distribution port in the reactor. The nutrient feed gravity flows into a sump located at the bottom of the reactor and may be recycled or drained to waste. This reactor environment is similar to those in industrial cooling towers, food preparation surfaces, painted and coated surface testing, marine environments, and other periodically wetted or humid biofilm growth surfaces. The ISBR can be used to model biofilm growth found in a large variety of industrial applications and public health environments.The components of the ISBR include: multi-ported glass vessel, ported lid, lid seal assembly, coupon holder rotor, fluid distribution port, 18 coupons (various materials available).
GA International Cryogenic Barcode Labels for Liquid Nitrogen Storage 1.625" x 0.625" / 41.3mm x 15.9mm Rectangle White From -196°C to +110°C (-321°F to +230°F)
NitroTAG labels are available in a range of sizes and configurations, perfect for identifying small-diameter cryo vials, microtubes and tube tops, cardboard or polypropylene cryo/freezer boxes, cell culture plates, and plastic bags.These thermal-transfer cryogenic labels have a strong permanent adhesive that will remain firmly and permanently attached in ultra-low temperatures. They are designed for long-term cryo-preservation under cryogenic laboratory conditions, including in liquid and vapor phase liquid nitrogen (-196°C/-321°F), freezers (-80°C/-112°F), and dry ice transportation.NitroTAG labels require zero cure time and can be immersed in liquid nitrogen immediately after application without the need for additional tape or lamination. Additionally, these labels are waterproof, weatherproof, and durable. NitroTAG labels will adhere to wet surfaces, resist multiple freeze-thaw cycles, and can withstand elevated temperatures up to +110°C.They are also resistant to spraying wi
Foxx Life Sciences Magnetic Stir Bar Mixer, 55mm Length, 8mm Diameter, Double Ended Dumbell Shape
257-1101-OEM: Magnetic Mixer, Double Ended, 8mm Diameter, 55mm Long. Foxx Life Sciences Magnetic Mixers are used to mix components in order to obtain a homogeneous liquid mixtures. Our mixers can be used in a variety of applications including but not limited to chemistry and biology experiments, buffer solutions, and bacterial growth media. Foxx magnetic mixers are ideal for mixing over a long period of time. Since our mixers are just magnet bars, they can easily be cleaned and the risks of contaminating the solution can be minimized.
Research Products International Corp MAG-NET Magnetic Spin Bar Remover/Restrainer
MAG-NET allows removal of spin bar from any beaker without touching the solution. Simply place MAG-NET against side of beaker and slide upwards. Conveniently hold spin bar in place while pouring solution from beaker. Safer and more convenient than immersion style retrievers. Heavy duty magnet is encased in polypropylene for easy cleaning and autoclaving.
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
Cowie Technology Corporation OCTAHEDRAL STIR 13MM L 8MM D
This item has a minimum order quantity of 200 per supplier requirements. Stirbar, octahedral, length 13 mm, diameter 8 mm
Koehler Instrument Company Inc KOEHLER INSTRUMENT COMPANY INC
NC3946967 BEARING 3/16X5/16IDX2 L SLEEVE
Foxx Life Sciences Borosil® Reusable Solid Stirring Rods, Polished Glass Stirrers, 9mm x 150mm (Short Length), 20/CS
Borosil® Polished Glass Solid Stirring Rods are constructed from smooth, low-expansion, low-extractable borosilicate glass. Their mechanical strength, excellent heat resistance, and outstanding chemical compatibility make them the perfect general use stirrer. Borosil® Glass Stirrers are avaialble in two widths: 7mm and Extra-Wide 9mm. Each width is available in four lengths, from the Short 150mm to the Extra Large 305mm. In collaboration with Borosil Glass Works, Foxx Life Sciences is proud to bring the outstanding quality of Borosil® Type 3.3 Borosilicate glassware to North America for the first time. Manufactured from the same USP Type 1 borosilicate glass that North American scientists have come to trust, Borosil® Laboratory Glassware offers unparalleled mechanical strength, clarity, and reliability at competitive prices. And thanks to a unique annealing process, Borosil® Glassware is stress-free and incredibly resistant to thermal shock.