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Scienceware F371500000 PTFE Cell Spinbar Magnetic Stir Bar for Cuvettes, 0.35" Diameter, 0.315" Height

List Price: $19.15
Price: $18.03 & FREE Shipping on orders over $35. Details
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  • Cell-shaped stir bar has cross-shaped channels on one side for horizontal and vertical mixing with minimal vortexing and no aeration
  • Teflon (PTFE) casing is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning
  • For use in cuvettes and spectrophotometer cells
  • Internal magnet made from alnico V, an alloy of aluminum, nickel, iron, and cobalt
  • Measures 0.35" (9 mm) in diameter by 0.315" (8 mm) in height
2 new from $18.03
$18.03 & FREE Shipping on orders over $35. Details Only 5 left in stock (more on the way). Ships from and sold by Gift-wrap available.

Product Information

Technical Details
Brand NameBel-Art Products
Item Weight0.8 ounces
Product Dimensions4.5 x 3 x 0.1 inches
Item model number371500000
Material TypePTFE (Polytetrafluoroethylene)
Number of Items1
Manufacturer Part Number371500000
Additional Information
Best Sellers Rank #362,616 in Office Products (See top 100)
Shipping Weight0.8 ounces (View shipping rates and policies)
Domestic Shipping Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
International Shipping This item is not eligible for international shipping. Learn More
Date First AvailableNovember 3, 2009
Warranty & Support

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From the Manufacturer

magnetic stirring, magnetic stirbars, magnetic spinbars

Magnetic Stirring

Magnetic Stirring Bar Selection & Use

Magnetic stirring is used in a number of common laboratory procedures, yet the importance of selecting the best stirring bar for each particular application is often overlooked. The drive magnet, vessel shape, viscosity and abrasiveness of the materials should all be considered when choosing the size, shape and materials (coating and magnet) of the magnetic stirring bar in order to achieve effective, efficient stirring results.

First, let’s discuss magnetism. On the most basic level, we know that opposite poles attract. A magnetic stirrer has a drive magnet, generally a bar or U-shape made of a metallic alloy or a ceramic which rotates powered by a drive motor. The magnetic poles of the drive magnet are typically about two inches apart in bench top models, and can be up to six inches apart in larger units used to mix 50 gallons of liquid solution. For optimum magnetic coupling the distance between the magnetic poles of the drive magnet and the length of the stirring bar should be equal. Bars too long or too short in proportion to the drive magnet will not have optimum coupling which is important to reduce spinout.

Once a magnetic stirring bar has been placed in a container with solution, it should be positioned directly over the center of the drive magnet. The stirring speed should be increased slowly, until the desired vortex pattern is achieved. Should the magnetic stirring bar lose its coupling with the drive magnet because of the speed of the drive magnet, viscosity of the fluid, or an improperly selected stirring bar length, it is said to have 'spun-out'.

Vertical distance between the drive magnet and the stirring bar should be kept to a minimum for the best coupling and stirring efficiency. Therefore, the containing vessel should be as thin as practical.

The selection of the shape of the magnetic stirring bar also influences the resulting vortex in that multi-sided shapes may be more efficient in moving solutions and certain shapes have been designed to provide a tailored fit in specialty vessels such as test tubes, cuvettes and spectrophotometer cells.

Magnetic stirring bars are generally made of Alnico (an alloy of aluminum, nickel, iron and cobalt) magnets encapsulated in an FDA approved PTFE coating. In addition, magnetic stirring bars also use high energy magnetic materials, such as Samarium Cobalt which increases strength of coupling with a drive magnet and helps to reduce spinout when mixing viscous solutions or mixing at high speeds.

Newer to the market, the Bel-Art Products Spinfinity magnetic stirring bars use Alnico magnets encapsulated in plastic for increased durability in granular slurries.

Use for General Stirring Applications Use for High Temperature Stirring Use for Viscous Solutions High Speed Stirring Use for Abrasive Slurries Extended Stirring Applications
Brand/ Type Spinbar Teflon PTFE Spinbar Pyrex Glass Spinbar Rare Earth Samarium Cobalt Spinfinity
Magnetic Type Alnico Alnico Samarium Cobalt Alnico
Covering Teflon PTFE Clear Pyrex Glass Teflon PTFE Plastic
Features / Benefits Wide selection of shapes and sizes to fit vessels of all types; Individual shapes create different vortexes for efficient and effective stirring Heated stirring applications up to 274°C (525°F) Reliable Magnetic Coupling – Superior magnetic energy reduces frequency of spinout in the most vigorous applications Durable – Last 2.5 to 3 times longer under conditions known to traditionally cause material breakdown
FDA grade Teflon PTFE low friction coating is durable and inert Glass casing has zero absorption and porosity FDA Grade Teflon PTFE low friction coating is durable and inert Outer shell made from FDA approved materials
Color selection for color-coding work processes Distinct Color – Green color lets you quickly identify Spinbar Rare Earth Samarium Cobalt Distinct Color – Quickly identify the Spinfinity difference by its purple color
magnetic spinbar for cuvettes, magnetic spinbars, magnetic stirbars

Cell (Cuvette) Spinbar Magnetic Stirring Bar

magnetic spinbar for cuvettes, magnetic stirring, magnetic spinbars
Cell (Cuvette) Spinbar Magnetic Stirring Bar
  • Size (D x H): 9 x 8mm

Cell (Cuvette) Spinbar Magnetic Stirring Bar

This magnetic stirring bar fits into the standard 10mm light path cuvette and provides rapid vertical and horizontal mixing with a minimum of vortexing when placed on a magnetic stirring machine.

  • Centrifugal pumping action, generated by the cross channels in the upper face, mixes without aeration
  • Photometric measurements can proceed uninterrupted while reagents are added
  • One-piece molded unit will not scratch cuvettes; may also be used in test tubes
  • Alnico magnet encapsulated in FDA Grade, USP Class VI Teflon PTFE low friction coating; durable and inert
  • Manufactured in a registered ISO 9001:2008, as verified by SGS certification
  • Autoclavable

Technical Details

  • Brand Name: Bel-Art Products
  • Part Number: 371500000
  • Material Type: PTFE (Polytetrafluoroethylene)
  • Number of Items: 1
  • Item Package Quantity: 1

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Scienceware F371500000 PTFE Cell Spinbar Magnetic Stir Bar for Cuvettes, 0.35" Diameter, 0.315" Height
This item: Scienceware F371500000 PTFE Cell Spinbar Magnetic Stir Bar for Cuvettes, 0.35" Diameter, 0.315" Height
Price: $18.03
Ships from and sold by
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