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.
Cole-Parmer Essentials PTFE Stir Bar, Plain, 25 x 10mm
These PTFE stir bars feature a slimmer profile and larger length to diameter ratio.
Enterprise Technology Solutions Crayola Crayons,Staonal Marking,Permanent,DblWrapped,NonToxic,w/ReusableBox,0.56"x5",8/Box,Red
Crayola Staonal Crayons are the go-to classic marking tool for a wide range of projects and surfaces. These sturdy, large crayons are double-wrapped for added strength and durability, ensuring they last through heavy use. The marking wax formula creates bold, permanent marks on surfaces such as cardboard, paper, aluminum, wood, and more, making them ideal for art, organization, and industrial tasks. Packaged in a convenient, reusable box for easy storage, these crayons are safe, nontoxic, and suitable for ages 4 and up, making them perfect for both kids and adults alike.
Ace Glass, Inc. PTFE banana stir blade, 35x175mm, 5L flask size, 10mm shafts
35X175MM PTFE STIR BLADE
Ace Glass, Inc. PTFE banana stir blade, 21x87mm, 500mL flask size, 10mmshafts
21X87MM PTFE STIR BLADE
Chemglass Life Sciences Stir Bar, Magnetic, Glass, Length x Dia. in mm: 12.7 x 9.52, Length x Dia. in inches: 1/2 x 3/8
Stir Bar, Magnetic, Glass, Length x Dia. in mm: 12.7 x 9.52, Length x Dia. in inches: 1/2 x 3/8. Borosilicate covered Alnico magnet for use in high temperature reactions.
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).
