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 Replacement Stir Bar Magnet for 6-36L Vessels
Replacement Components for CLS-1410- and CLS-1411-Series Spinner Flasks.The Replacement Shaft consists of the glass shaft only.
Electron Microscopy Sciences Veco Parallel Bar w/ Divider Handle R200D, Nickel
Veco Grids offer superior handling characteristics. Plus, with a 0.8 mil thickness, Veco Grids are the most rigid grids available. 3.05 mm diameter and 0.8 mil thickness.
Material: Nickel
Pitch: 125 µm
Hole: 85 µm
Bar: 40 µm
Cowie Technology Corporation OCTAHEDRAL STIR 13MM L 10MM D
This item has a minimum order quantity of 134 per supplier requirements. Stirbar, octahedral, length 13 mm, diameter 10 mm
Cowie Technology Corporation OCTAHEDRAL STIR 51MM L 8MM D
This item has a minimum qty of 36 per supplier requirements.
Stirbar, octahedral, length 51 mm, diameter 8 mm
Cowie Technology Corporation REMOVABLE RING STIR L38MM D8MM
This item has a minimum qty of 35 per supplier requirements.
Stirbar, removable ring, length 38 mm, diameter 8 mm
PATHOLOGY INNOVATIONS 50X30 MM WELL BAR SET
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 50x30mm Well Bar Set comes with one well bar with two 50 x 30 x 3mm wells, and two "extra large" 55 x 35 mm chucks. This set is made for outfitting labs that process a high volume of frozen sections with various sized speciments, 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.