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.
Fisherbrand™ Magnetic Spinbar™ Retrievers
Reach down drains for lost bars.
Bel-Art™ Magnetic Stirring Bar Arrester
Prevents stirring bars from pouring out when emptying containers.
Wilmad Labglass STIR BRNG 10MM PTFE COMP 24/40
Stirrer Bearing, Precision, PTFE, Complete, 10mm. Joint Size: [ST] 24/40. Complete assembly includes PTFE Stirrer Bearing, PTFE bushing, saddle O-Ring, threaded heavy wall glass adapter and top screw cap.
Chemglass Life Sciences Stir Bar Retriever, PTFE, 450 x 10 mm - For magnetic stir bars
Designed to recover magnetic stir bars from deep reaction vessels, this PTFE-coated stir bar retriever measures 450 x 10 mm and provides chemically inert, autoclavable performance. Its long shaft and magnetic tip allow safe, convenient retrieval without contaminating samples.
- Inert PTFE construction for chemical resistance.
- 450 x 10 mm length and diameter for deep vessels.
- Autoclavable for laboratory reuse.
- Molded in FDA-approved PTFE for leak-free performance.
- Available with Alnico V or rare earth magnet options.
- Designed to retrieve magnetic stir bars without sample contamination.
Chemglass Life Sciences Stir Bar Kit, Magnetic, Egg-Shaped, PTFE
Stir Bar Kit, Magnetic, Egg-Shaped, PTFE. Stir Bar Kit, Magnetic, Egg-Shaped, PTFE, to consist of the following: 6ea CG-2005-10, 6ea CG-2005-12, 3ea CG-2005-14, 2ea CG-2005-15, 1ea CG-2005-16PLEASE NOTE: STIR BAR KITS ARE AVAILABLE WITH AN ASSORTMENT OF OTHER STYLES AND SIZES. PLEASE CONTACT TECHNICAL SERVICE FOR MORE INFO.
Chemglass Life Sciences Chemglass Magnetic PTFE Stir Bar, Turbo Rare-Earth, Elliptical, 15 x 10 mm
Chemglass magnetic PTFE stir bar with a rare-earth turbo magnet and an elliptical (egg-shaped) profile. It provides exceptional magnetic coupling with near-total resistance to demagnetization and is identified by an inert carbon black spot. Made in the United Kingdom.
- PTFE construction.
- Rare-earth turbo magnet for exceptional magnetic strength.
- Dimensions: 15 x 10 mm.
- Elliptical (egg-shaped) profile.
- Identified by inert carbon black spot.
- Exceptional resistance to demagnetization.
- Made in the United Kingdom.
Chemglass Life Sciences Chemglass Stir Bar, PTFE-Coated Magnetic Micro, 10 x 3 mm, Pack of 50 - for magnetic stirrers
Chemglass PTFE-coated magnetic micro stir bars provide reliable mixing in very small volumes. Each bar measures 10 x 3 mm and is bulk packed in a 50-piece set for convenient laboratory use. The PTFE coating meets FDA-grade and USP Class VI standards for chemical resistance and biocompatibility.
- PTFE coating with FDA-grade and USP Class VI compliance.
- Micro size: 10 x 3 mm.
- Bulk pack: 50 pieces per pack.
- Designed for use with magnetic stirrers and hot plate stirrers.
- Suitable for small-volume mixing and agitation.
Chemglass Life Sciences Stir Bar, Magnetic, Egg-shaped, fits 2000mL-3000mL flask, Length x Dia. in inches: 2 x 3/4
Stir Bar, Magnetic, Egg-shaped, fits 2000mL-3000mL flask, Length x Dia. in inches: 2 x 3/4. Egg-shaped magnetic stirring bar provides its own pivot point without separate ring or abrupt change in contour. Designed for use in round bottom vessels, it is shaped to spin freely, unrestricted by the vessel contour. Manufactured with FDA-grade and USP Class VI PTFE.SEE CG-2005-20 FOR STIR BAR KIT
ATS LIFE SCIENCES SCIENTIFIC PRODUCTS MAGNETIC STIR BAR RETRIVER
NC3365409 MAGNETIC STIR BAR RETRIVER
Cole-Parmer Mono-Mold Standard Stir Bar with Spinning Ring, 3"L x 1/2" dia
Mono-Mold magnetic stir bars are the standard all-purpose stir bar. Available with or without spinning rings; rings reduce contact area between stir bar and vessel, reducing friction and noise.
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 12.7 x 7.93, Length x Dia. in inches: 1/2 x 5/16
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 12.7 x 7.93, Length x Dia. in inches: 1/2 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: 12.7 x 3.18, Length x Dia. in inches: 1/2 x 1/8
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 12.7 x 3.18, Length x Dia. in inches: 1/2 x 1/8. 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, Micro, Magnetic, PTFE, Length x Dia. in mm: 5 x 2
Stir Bar, Micro, Magnetic, PTFE, Length x Dia. in mm: 5 x 2. Micro PTFE stir bar for the very smallest containers. Manufactured with FDA-grade and USP Class VI PTFE.SEE CG-2003-50 FOR STIR BAR KIT
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.