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.
Chemglass Life Sciences Stir Bar, Micro, Magnetic, PTFE, Length x Dia. in mm: 5 x 2, Bulk Packed
Stir Bar, Micro, Magnetic, PTFE, Length x Dia. in mm: 5 x 2, Bulk Packed. Micro PTFE stir bar for the very smallest containers. Manufactured with FDA-grade and USP Class VI PTFE.
Spectrum Pharma Quip Specialties Inc S BAR OCT 3/8 X1 1/2 100/CS
SPECTRUM PHARMA-QUIP SPECIALITES STIR BAR, OCTAGONAL, (10MM X 38MM), 3/8 in. X 1 1/2 in. 100/CS
Foxx Life Sciences Borosil Reusable Solid Stirring Rods, Polished Glass Stirrers, 7mm x 205mm (Medium 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.
Chemglass Life Sciences Stir Bar Retriever, Polypropylene, 3/8in Dia. x 18in OAL
Stir Bar Retriever, Polyethylene, 3/8in Dia. x 18in OAL. A 3/8" diameter pick up rod with a powerful Alnico magnet in one end and hang up grip on the other.
Electron Microscopy Sciences 18" Polypropylene Retriever
Polypropylene stirring bar retrievers are ideal for use with all stirring bars. The entire retriever is totally encased in a chemically resistant polypropylene, with a handy ring for hanging when not in use.
Electron Microscopy Sciences Sterile Petri Dish 60x9 mm, 12 ml, 50x8 mm
Our Petri Dishes are available in a variety of shapes and sizes for use in routine procedures and with automated equipment. Economical, optical clarity, dishes are precision-molded from biomedical grade polystyrene so cultures are clearly visible without distortion. Dishes are packaged 20 each in sturdy polyethylene sleeves. These dishes are not recommended for tissue culture application, due to non treated by "corona effect". Made of polystyrene. Box type dish with tight lid ideal for culturing of mycobacteria aerosol testing, membrane filter and immunodiffusion.
Volume: 12 ml
Size: 50 x 8 mm
Sterile: Sterile