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.
Research Products International Corp Spinbar Magnetic Stirring Bar Sink Stainer, Green
The Spinbar Magnetic Sink Strainer provides an innovative solution to a common laboratory inconvenience. Prevents magnetic stirring bars from accidentally slipping into the drain when cleaning beakers or cylinders. Flexible chemical resistant strainer has four strong magnets that attract and hold stirring bars. The strainer is designed with long slits that allow unobstructed drainage of fluids. Strainer remains securely in place and fits a variety of sinks. Flat edge allows strainer to be placed near the sink wall.
Research Products International Corp Spinbar Magnetic Sink Strainer, Blue
The Spinbar Magnetic Sink Strainer provides an innovative solution to a common laboratory inconvenience. Prevents magnetic stirring bars from accidentally slipping into the drain when cleaning beakers or cylinders. Flexible chemical resistant strainer has four strong magnets that attract and hold stirring bars. The strainer is designed with long slits that allow unobstructed drainage of fluids. Strainer remains securely in place and fits a variety of sinks. Flat edge allows strainer to be placed near the sink wall.
COWIE TECHNOLOGY CORPORATION PTFE TURBO STIRBAR CYLD 100/PK
NC0996444 PTFE TURBO STIRBAR CYLD 100/PK
Cole-Parmer Micro Stir Bar, 10mm L x 3mm dia 10mm L x 3mm dia.
Strong alnico V magnets with one-piece coating of PTFE.
V&P Scientific Inc STIR ELEMENT, DISC, NdFeB Magnet, 42MGO, PVDF Encapsulated, Used in Microplates, Syringes, Tubes/Vials, 10/pack
STIR ELEMENT, DISC, NdFeB Magnet, 42MGO, PVDF Encapsulated, 8.0mm Diameter, 1.8mm Height, 150°C Max Operating Temp for Magnets
Electron Microscopy Sciences Micro Stir Bars, 3 x 12.7 mm
Coated with "PTFE" white resin. For stirring test tubes, micro-beakers, and more.
Size: 1/8 x 1/2"
Electron Microscopy Sciences 16 Spin Bars Assortment Box
Box contains 16 assorted bars; 12 octagon magnetic stirring bars, PTFE with pivot ring and 4 fleas, 2 each: 7mmx2mm, 10mmx3mm, 1/2"x 5/16", 5/8 "x 5/16", 1"x3/8", 1.5"x 3/8", 2"x 3/8", 2.5"x 3/8".
Electron Microscopy Sciences Micro Stir Bars, 1.5 x 15 mm
Coated with "PTFE" white resin. For stirring test tubes, micro-beakers, and more. Packed 12 bars per box. 1/16 x 9/16 inches; 1.5x15mm
Chemglass Life Sciences Stir Bar, Magnetic, Triangular, PTFE, 25mm L X 14mm Diameter
Stir Bar, Magnetic, Triangular, PTFE, 25mm L X 14mm Diameter. Effective for dissolving solids and mixing sediments in a flat bottom container such as a beaker or erlenmeyer flask. Manufactured with FDA-grade and USP Class VI PTFE.
Essendant STICKERSSTICK TOGETHER
Bring the fun colorful look of the vinyl sticker trend into your classroom or home with We Stick Together Themed Vinyl Stickers from Carson-Dellosa Education A must-have for any teacher s desk or prize box these unique stickers feature a wide variety of cheerful designs and encouraging statements to spread positivity Use them to decorate classroom supplies and folders to reward performance on tests quizzes and assignments or for making posters scrapbooks invitations greeting cards and more They re also ideal as party favors and gift/swag bag gifts Waterproof and fade-resistant they can stick to just about anything- plastics fabrics ceramics metals and more Illustration- Assorted Color(s)- Assorted Width- Assorted Height- Assorted
HTDialysis LLC HTD Universal Stainless Steel Connecting Rods
HTD Universal Stainless Steel Connecting Rods. Replacement part for HTD reusable micro equilibrium dialysis or buffer exchange desalting devices. The HTD devices were developed at a Global Pharmaceutical Research Laboratory with and combine industry-leading accuracy and precision with an automation compatible design for a scalable, cost-efficient, and eco-friendly solutionFor use with:HTD96B – equilibrium dialysis device HTD96C – equilibrium dialysis deviceHTD12A – buffer exchange and desalting device