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  • Scienceware F371740000 Teflon (PTFE), Fluted, Octagonal, Green, Rare Earth Samarium Cobalt Spinbar Magnetic Stir Bar, 1.969" Length, 0.83" Diameter
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Scienceware F371740000 Teflon (PTFE), Fluted, Octagonal, Green, Rare Earth Samarium Cobalt Spinbar Magnetic Stir Bar, 1.969" Length, 0.83" Diameter


List Price: $90.80
Price: $59.29 & FREE Shipping. Details
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  • Octagonal shape with fluted ends provides more turbulence than a non-fluted octagonal stir bar and can be used with containers with curved bottoms
  • Teflon (PTFE) casing is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning
  • Spins on the bottom of the container to disperse sediment and air bubbles
  • Internal magnet made from samarium cobalt provides stronger magnetic attraction in viscous solutions and at high speeds than a magnet made from an alloy of alnico V
  • Green color for quick identification
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Product Description

Bel-Art Komet Super Stirrin Bar F-37174-0000, Each


Product Information

Technical Details
Brand NameBel-Art Products
Item Weight1.6 ounces
Product Dimensions5.9 x 3.7 x 0.7 inches
Item model number371740000
ColorGreen
ShapeOctagon
Material TypePTFE (Polytetrafluoroethylene)
Number of Items1
Manufacturer Part Number371740000
  
Additional Information
ASINB002VBW77A
Best Sellers Rank #264,094 in Office Products (See top 100)
Shipping Weight1.6 ounces (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First AvailableNovember 3, 2009
  
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From the Manufacturer

magnetic stirring, spinbars, stirbars, magnetic stirbars

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-shaped 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 spin-out.

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 Applications Use for Viscous Solutions High Speed Stirring Applications 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 fluted spinbar, octagonal spinbar, green spinbar, rare earth samarium cobalt spinbar

Fluted, Octagonal Rare Earth Samarium Cobalt Magnetic Spinbar

This bar’s high-energy magnetic material combined with a fluted octagonal shape produces exceptional power, although its length is only 50mm (1.969") with a 21mm (0.83") diameter.

  • Ideal for viscous solutions and efficient, high speed stirring
  • Samarium Cobalt magnet encapsulated in FDA grade, USP Class VI Teflon PTFE provides strong coupling with drive magnets
  • Recessed flutes and distinct edges of this eight-sided bar provide excellent surface area; generates strong turbulence so liquids are thoroughly mixed
  • Stability is not impaired in vessels with curved bottoms
  • Manufactured in a registered ISO 9001:2008, as verified by SGS certification
  • Autoclavable

Technical Details

  • Brand Name: Bel-Art Products
  • Part Number: 371740000
  • Material Type: PTFE (Polytetrafluoroethylene)
  • Number of Items: 1
  • Item Package Quantity: 1

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Scienceware F371740000 Teflon (PTFE), Fluted, Octagonal, Green, Rare Earth Samarium Cobalt Spinbar Magnetic Stir Bar, 1.969" Length, 0.83" Diameter
This item: Scienceware F371740000 Teflon (PTFE), Fluted, Octagonal, Green, Rare Earth Samarium Cobalt Spinbar Magnetic Stir Bar, 1.969" Length, 0.83" Diameter
Price: $59.29
Ships from and sold by Amazon.com
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