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.
Ace Glass, Inc. PTFE baffle, 6.4mm diax175mm length shaft. Fits #7Ace-Thred adapter. Baffle dimensions-18mmx152mmx10mm, 327mm overall length.
18mm X 152mm X 10mm PTFE Baffle. Overall length: 327mm. Use with #7 Ace-Thred adapters to mate glass or PTFE (stainless steel core) baffles to any standard taper joint. Baffles can be adjusted vertically, or rotated to increase agitation.
Electron Microscopy Sciences Wood Stirring Rods
Smooth 8" long hardwood. One end flat for mashing, one end sharply pointed for pin-point stirring.
Electron Microscopy Sciences Glass Rods, 200 mm Long
Useful tool for all laboratories needs to stir / mix substances. Glass rods are 5 mm diameter.
Foxx Life Sciences Borosil Reusable Solid Stirring Rods, Extra Wide Polished Glass Stirrers, 9mm x 255mm (Large 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 Avail. 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.
Electron Microscopy Sciences Stirring Rod PTFE with Steel Core, 400 mm, 6 mm diameter
Steel core can be bent into a permanent shape, rods are inert and will not scratch, use up to 280 degree C, rod OD: 6 mm.
OAL: 400 mm
Rod: 6 mm
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
Electron Microscopy Sciences Stirring Rod PTFE with Steel Core, 100 mm, 6 mm diameter
Steel core can be bent into a permanent shape, rods are inert and will not scratch, use up to 280 degree C, rod OD: 6 mm.
OAL: 100 mm
Rod: 6 mm
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.
Electron Microscopy Sciences Stirring Rod PTFE with Steel Core, 250 mm, 6 mm diameter
Steel core can be bent into a permanent shape, rods are inert and will not scratch, use up to 280 degree C, rod OD: 6 mm.
OAL: 250 mm
Rod: 6 mm
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.