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.
Sigma Aldrich Fine Chemicals Biosciences Rare earth extra power stir bars, 3/pk
Elliptical, diam. 6 mm, L 10 mm. Stirring bars using rare earth magnets have significantly increased magnetic strength compared to those using Alnico magnets, but more importantly they are almost totally resistant to demagnetisation.
Bar, Stir; Biotage; Magnetic; For 0.2-0.5mL microwave vials; 25/case
Bar, Stir; Biotage; Magnetic; For 0.2-0.5mL microwave vials; 25/case
Biotage Magnetic Stir Bars, for 10-20 mL Microwave Reaction Vial 5/Case
Biotage Magnetic Stir Bars, for 10-20 mL Microwave Reaction Vial 5/Case
Biotage Magnetic Stir Bars, for 2-5 mL Microwave Reaction Vials 25/Case
Biotage Magnetic Stir Bars, for 2-5 mL Microwave Reaction Vials 25/Case
Chemglass Life Sciences Stabilizer Bars, Set of Three, for 1-3L Bioreactor Stands
Bars attach to the legs of bioreactor stands with two adjustable hex head screws and add an additional measure of safety.For use with both jacketed and unjacketed bioreactor stands.Each bar has silicone pads on the ends for cushioning and added extra grip.Sold as a set of three. 1-3L stabilizer bars are 4” long5-7 stabilizer bars are 4” long15L stabilizer bars are 6” long
Electron Microscopy Sciences 5 Spinplus Spin Bar Assortment Box
Add speed and efficiency to your mixing, the "+" shape creates a deep vortex and provides stability to your mixing, 5 SpinPlus magnetic stirring bars, PTFE, consists of 1 each: 3/8"x3/8", 3/4"x 3/4", 1"x1", 1/4"x 1/4", 1.5"x1.5".
Yamato Scientific America, Inc. Yamato Digital Laboratory Stirrer, Max speed of 340 rpm. Complete with stand and rod, stirring shaft and 4-blade propeller. 100V-125V
Digital laboratory stirrer with speed range of 34-340 rpm for high viscosity samples. DC brushless motor considered superior in safety as there are no brushes to cause sparks and no brush replacement required. Direct-drive system reduces noise and require low maintenance. Achieves high torque enabling stirring of high viscosity solution. Digital tachometer for easy speed setting and confirmation. Load on the stirring shaft can be monitored by LED2 display. An overload lamp turns on when exceeding the maximum load, stopping the motor automatically. Revolution feedback control function can maintain the setting rate despite change of load (especially suitable for high viscosity samples)Set includes stand, rod, stainless steel shaft and 75mm 4-blade propeller.
Electron Microscopy Sciences 13 Egg-Shaped Spin Bar Assortment Bx
Egg-shaped magnetic stirring bars provide own pivot point. Designed for use in round-bottom vessels, 13 Egg-shaped spin bars, PTFE, consists 1 each: 3" x 3/4", 2 each: 3/4 "x 3/8", 1 "x 1/2", 1/4" x 5/8", 1.5" x 5/8 ", 1 5/8 x 3/4", 2" x 3/4".
Electron Microscopy Sciences Magnetic Stirring and Mixing Bars, 25.4 mm L, 8 mm diameter
These bars are designed for single use applications where efficiency and cross contamination is a concern. These economical bars have a "PTFE" coating which is chemically inert for high purity contact. The magnet is an Alnico V.
OAL: 25.4 mm
Diameter: 8 mm
Electron Microscopy Sciences Spinbar Circulus™ Dumbbell Stiriing Bar 32mm White
These magnet stirring bars provide strong turbulence at relatively low speeds, offering reduced surface contact and excellent centering characteristics, particularly in vessels with convex bottoms. Ideal for 'problem' liquids, highly viscous mixtures and metal particles in fluid. All sizes have solid PTFE end disks 20 mm (.79”) in diameter. Bar diameter is 8 mm (.315”).
Color: White
Electron Microscopy Sciences Spinbar Circulus™ Dumbbell Stiriing Bar 32mm Blue
These magnet stirring bars provide strong turbulence at relatively low speeds, offering reduced surface contact and excellent centering characteristics, particularly in vessels with convex bottoms. Ideal for 'problem' liquids, highly viscous mixtures and metal particles in fluid. All sizes have solid PTFE end disks 20 mm (.79”) in diameter. Bar diameter is 8 mm (.315”).
Color: Blue
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.
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 22 x 8, Length x Dia. in inches: 5/8 x 5/16
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 22 x 8, Length x Dia. in inches: 5/8 x 5/16. Octagon cross-section having a molded-in pivot ring manufactured with FDA-grade and USP Class VI PTFE. The PTFE coated Alnico magnet permits magnetic agitation without contamination.SEE CG-2001-50 FOR STIR BAR KIT
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 15.9 x 7.93, Length x Dia. in inches: 5/8 x 5/16
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 15.9 x 7.93, Length x Dia. in inches: 5/8 x 5/16. Octagon cross-section having a molded-in pivot ring manufactured with FDA-grade and USP Class VI PTFE. The PTFE coated Alnico magnet permits magnetic agitation without contamination.SEE CG-2001-50 FOR STIR BAR KIT