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, 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.
Azzota Corp Ptfe Magnetic Stir Bar Retriever, Length: 12" (300mm)
PTFE Magnetic Stir Bar Retriever, Length: 12" (300mm)
Cole-Parmer Bel-Art Stir Bar Retriever, Flexible PTFE; 14-3/4" Long
Easily retrieve stir bars without spills or possible breakage. The alnico V magnet is completely enclosed in PTFE.
Grainger Round Rod Aluminum 36 in Overall L PK3
The Aluminum Rod 6061 from Grainger is 3/8 inch in diameter and is made of aluminum alloy 6061. It has excellent corrosion resistance and good machinability and surface finishing. The rod has a tensile strength range of 38-45 ksi and meets ASTM B211 specifications. It comes in 12 foot lengths and has a smooth surface finish. The aluminum rod can be used for shafts, fixtures, couplings and other precision parts where strength and corrosion resistance is needed.
Electron Microscopy Sciences Micro Stir Bars, 3 x 12.7 mm
Coated with "PTFE" white resin. For stirring test tubes, micro-beakers, and more.
Size: 1/8 x 1/2"
Cowie Technology Corporation OCTAHEDRAL STIR 51MM L 8MM D
This item has a minimum qty of 49 per supplier requirements.
Stirbar, octahedral, length 51 mm, diameter 8 mm
Cowie Technology Corporation MICRO STIRBAR 6MM L 3MM D
This item has a minimum order quantity of 182 per supplier requirements. Stirbar, micro, length 6 mm, diameter 3 mm
PATHOLOGY INNOVATIONS The Peters Precision Cryoembedding System 20x20 Deep Well Bar Set includes one 20x20mm Deep Well Bar, which has two 6mm deep wells and two 9mm deep wells, as well as 4 small chucks, two over chuck freezing blocks and 8 dispensing slides.
The Peters Precision Cryoembedding System is a combination of simple techniques and apparatus which allows the user to embed tissues for frozen section with a level of control and predictability that can surpass even paraffin embedding. The 20x20 Deep Well Bar Set includes one 20x20mm Deep Well Bar, which has two 6mm deep wells and two 9mm deep wells, as well as 4 small chucks, two over chuck freezing blocks and 8 dispensing slides. This system was designed by inventor, professor and author of frozen section literature Dr. Stephen Peters to give users more precision and control when doing a high volume of frozen section procedures. This set is made for outfitting labs that process a high volume of frozen sections with average sized specimen, and a great way to get started using the Peters Precision Cryoembedding System which has been adopted by thousands of hospitals globally. Learn how to use the system as well as advanced frozen section technique at pathologyinnovations.com.
Cowie Technology Corporation MICRO STIRBAR 6MM L 3MM D
This item has a minimum order quantity of 159 per supplier requirements. Stirbar, micro, length 6 mm, diameter 3 mm
Ace Glass, Inc. Stirbar, PTFE, egg shape, 25.4mmx12.7mm
25.4mm x 12.7mm egg-shaped PTFE magnetic stir bar which provides a pivot point without a separate ring or abrupt change in contour. Designed to be used with round bottom flasks and DynaBlocs.
Azzota Corp Magnetic Stirring Bars - Z Type, 7mm Length, Dia. 3mm
Magnetic stirring Bars - Z type, 7mm length, Dia. 3mm