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 Vanes, PTFE, 5.25mm Width X 11mm Height
Stir Vanes, PTFE, 5.25mm Width X 11mm Height. Stir Bars, PTFE Covered, for Microwave vials. Manufactured with FDA-grade and USP Class IV PTFE.
Uline Steel Ratchet Load Bar With Hoops - Rubber Ends, 87-119"
Steel Ratchet Load Bar With Hoops-Rubber Ends 87-119IN
Hach Company Stir Bar, Micro, 2 x 7 mm
Use micro stir bar for mixing in vials, test tubes, spectrophotometer cells and other small-volume containers. Usable at temperatures up to 260°C. Alnico V magnet encapsulated in PTFE.
Chemglass Life Sciences Stir Bar, Magnetic, Triangular, PTFE, 55mm L X 14mm Diameter
Stir Bar, Magnetic, Triangular, PTFE, 55mm 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.
Chemglass Life Sciences Stir Bar, Magnetic, "X" Shaped, PTFE, 50 x 15: Diameter x Height (mm)
Stir Bar, Magnetic, "X" Shaped, PTFE, 50 x 15: 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.
Chemglass Life Sciences Stir Bar, Magnetic, Triangular, PTFE, 50mm L X 12mm Diameter
Stir Bar, Magnetic, Triangular, PTFE, 50mm L X 12mm 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.
Chemglass Life Sciences Stir Bar, Magnetic, "X" Shaped, PTFE, 10 x 5: Diameter x Height (mm)
Stir Bar, Magnetic, "X" Shaped, PTFE, 10 x 5: 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.
Hach Company Stir Bar, Magnetic, Plus Shape, 3/8"
This magnetic stir bar adds speed and efficiency to your mixing requirements. The “+” shape creates a deep vortex and provides stable, quiet operation.
Electron Microscopy Sciences Vacuum Pick-Up I-line Filter 3/8" x1.5"
VaccuumPick Up handles delicate objects in the laboratory. The system avoids contamination of parts and performs functions that tweezers does such as sorting, picking up, holding, carrying, and transferring. It is ideal for handling cover slips without the use of forceps.
Light weight, completely assembled and ready for immediate operation as soon as the proper tip is selected and installed. The vacuum generator has an adjustable vacuum pressure control from 1" Hg to 15" Hg.
Vacuum pick-up system includes: vacuum generator, aluminum vacuum pen, five vacuum tips, set of seven rubber vacuum cups (size ranging: 9⁄16", 1/2", 7⁄16", 3⁄8", 5⁄16", 1⁄4" and 3⁄16"), an in-line filter, and 4 ft (122cm) of vacuum tubing.
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
