Stirring Bars and Rods
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.
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Filtered Search Results
Fisherbrand™ PTFE Stir Bars with Pivot Ring
Provides stable stirring action. Fisherbrand™ PTFE Stir Bars with Pivot Ring are ideal for containers with uneven or unusual bottom surfaces and shapes.
Shape | Cylinder,Pivot ring |
---|---|
Description | PTFE encapsulated Alnico V magnet core; Cylindrical with Pivot Ring |
For Use With (Equipment) | Containers & Vessels / Stirrer Hot Plates |
Color | White |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Autoclavable | Autoclavable |
Fisherbrand™ Cylindrical PTFE or Glass Stir Bars
Alnico V magnet core encapsulated by PTFE or glass . Fisherbrand™ Cylindrical PTFE or Glass Stir Bars are autoclavable.
Shape | Cylinder |
---|---|
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Autoclavable | Autoclavable |
Fisherbrand™ PTFE Micro Magnetic Stir Bar
Designed for the smallest containers. Fisherbrand™ PTFE Micro Magnetic Stir Bar are autoclavable.
MBL™ Borosilicate Glass Stirring Rod
Minimize scratching with these glass stirring rods. MBL™ Borosilicate Glass Stirring Rods are ideal for a wide range of stirring applications.
Fisherbrand™ Oval PTFE Stir Bar
Provides stable stirring action. Fisherbrand; Oval PTFE Stir Bar povides optimal turbulence for round-bottom flasks and containers.
Shape | Oval |
---|---|
Description | PTFE encapsulated Alnico V magnet core |
For Use With (Equipment) | Round bottom flasks |
Color | White |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Autoclavable | Autoclavable |
Fisherbrand™ PTFE Giant Stir Bar
Designed for use in large containers and vials. These giant PTFE-coated magnetic stir bares are autoclavable.
For Use With (Equipment) | Containers & Vessels / Stirrer Hot Plates |
---|---|
Color | White |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Autoclavable | Autoclavable |
Fisherbrand™ Plain Economy PTFE Stir Bar
Provides stable stirring action. The plain economy PTFE magnetic stir bar work within a wide range of conditions, low prices from high-volume manufacturer.
Description | PTFE encapsulated Alnico V magnet core |
---|---|
For Use With (Equipment) | Containers & Vessels / Stirrer Hot Plates |
Color | White |
Quantity | 10/Pk. |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Autoclavable | Autoclavable |
Fisherbrand™ Plain PTFE Stir Bars
Provides stable stirring action. Fisherbrand™ Plain PTFE Stir Bars provide greater turbulence than cylindrical stir bars.
Description | PTFE encapsulated Alnico V magnet core |
---|---|
For Use With (Equipment) | Containers & Vessels / Stirrer Hot Plates |
Color | White |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Autoclavable | Autoclavable |
Fisherbrand™ Triangular PTFE Stir Bars
Particularly effective for dissolving solids and mixing sediments due to scraping-like action on the base of the container. The triangular PTFE stir bar provides stable stirring action for flat-bottom containers.
Shape | Triangle |
---|---|
Description | PTFE encapsulated Alnico V magnet core |
For Use With (Equipment) | Containers & Vessels / Stirrer Hot Plates |
Color | White |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Autoclavable | Autoclavable |
Fisherbrand™ Octahedral PTFE Stir Bar
Provides stable stirring action. These PTFE magnetic stir bars are autoclavable and include a pivot ring. The flat surfaces provide a great mixing action.
Shape | Octahedral |
---|---|
Description | PTFE encapsulated Alnico V magnet core |
For Use With (Equipment) | Containers & Vessels / Stirrer Hot Plates |
Color | White |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
Autoclavable | Autoclavable |
Quantity | 50/Pk. |
---|---|
Material | Glass |
Fisherbrand™ Solid PTFE Stirring Rod
Can be used in temperatures up to 280°C (540°F). The PTFE stirring rod has a solid PTFE core. These rods are chemically resistant, inert, and leak-free.
Description | Solid PTFE |
---|---|
Diameter (Metric) | 8 mm |
Quantity | 2/Pk. |
Certifications/Compliance | Certificate of Conformance, Certificate of Analysis, Product Data Sheet, Material Safety Data Sheet (MSDS) |
For Use With (Application) | Mixing of various chemicals |
Autoclavable | Autoclavable |
Azlon™ Micro Magnetic Stirrer Bar
Use these bars in for a variety of stirring applications. Fisherbrand™ Azlon™ Micro Magnetic Stirrer Bars are ideal for small vessels, test tubes and vials.