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 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.
Sanisure Inc SS-SB-1080-PVDF-G IR QTY5-25
PVDF 10 mm x 80 mm Magnetic Gamma Stable Stir Bars - Individually Bagged, IrradiatedTHIS ITEM IS SET UP WITH A QUANTITY BREAK PRICE STRUCTURE(THIS NC CAN ONLY BE USED TOWHEN ORDERIGN QUANTITIES OF 5-25 UNITS), PLUS THE ITEM MUST BE PURHCASED IN MULTIPLES OF 5 UNITS. --- ORDER WILL BE CANCELLED THIS NC NOT ENTEREDIN MULTIPLES OF 5 AND IN QUANTITIES OF 5-25UNITS.
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.
Cole-Parmer Glass Stir Rods with Rubber Policeman, 8" 12/pk
Glass stir rods are manufactured with soft borosilicate glass with both ends rounded. They come with a pre-assembled, removable rubber policeman for transferring liquids or clearing precipitate out of containers. Glass rods are chemically resistant and can withstand temperatures to 400°F (205°C) (without rubber policemen). Autoclavable.
Cole-Parmer Dynalon Polypropylene (PP) Paddled Stir Rod, 9-3/4" L; 10/Pk
Use as a stir rod, policeman, or small spatula. Polypropylene (PP) rod features flat and triangular paddles at opposite ends. Max temperature is 266°F (130°C). Autoclavable.
Environmental Sampling Supply Inc ENVIRONMENTAL SAMPLING SUPPLY INC
NC3966834 40ML VIAL SEPTA STIR BAR 72/CS
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, Micro, Magnetic, PTFE, Length x Dia. in mm: 12.7 x 3
Stir Bar, Micro, Magnetic, PTFE, Length x Dia. in mm: 12.7 x 3. 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
Cole-Parmer Large-Volume Stir Bar, 6-1/4"L x 1-1/16"dia
Use this large-volume stir bar with your large-capacity stirrers and hot plate stirrers.
Chemglass Life Sciences Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 50.8 x 9.52, Length x Dia. in inches: 2 x 3/8
Stir Bar, Magnetic, PTFE, Length x Dia. in mm: 50.8 x 9.52, Length x Dia. in inches: 2 x 3/8. 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
Sarstedt Inc Stirring Rods, Polypropylene, 120mm, 500/Pack
Stirring Rods; Polypropylene; 120mm; 500/pk