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  • Scienceware F371630000 Teflon (PTFE), Color-Coded, Octagonal Spinpak Magnetic Stir Bar Assortment, with Pivot Ring
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Scienceware F371630000 Teflon (PTFE), Color-Coded, Octagonal Spinpak Magnetic Stir Bar Assortment, with Pivot Ring


List Price: $40.65
Price: $27.89 & FREE Shipping on orders over $35. Details
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Only 3 left in stock (more on the way).
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Assortment with Pivot Ring/Octogonal
  • Octagonal shape creates more turbulence than round, cylindrical stir bars
  • Teflon (PTFE) casing is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning
  • Built-in pivot ring on the stir bars reduces vibration and wear during stirring
  • Pack includes red, blue, and yellow stir bars, for differentiating stir bars among stirring applications
  • Contains six 1 x 0.3125" (25.4 x 8 mm) stir bars
2 new from $27.89

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$27.89 & FREE Shipping on orders over $35. Details Only 3 left in stock (more on the way). Ships from and sold by Amazon.com. Gift-wrap available.

Product Description

Size: Assortment with Pivot Ring/Octogonal

Bel-Art Spinbar Pack COLOUR-CODED 6/PK F371630000, Pack of 6

Product Information

Size: Assortment with Pivot Ring/Octogonal
Technical Details
Brand NameBel-Art Products
Item Weight1.6 ounces
Product Dimensions6 x 3.3 x 0.1 inches
Item model number371630000
Material TypePTFE (Polytetrafluoroethylene)
Number of Items6
SizeAssortment with Pivot Ring/Octogonal
Manufacturer Part Number371630000
  
Additional Information
ASINB002VBW73O
Best Sellers Rank #293,851 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 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

Spinpak Magnetic Stirring Bar Six Pack Assortments

Teflon PTFE

Convenient assortment packs suit a variety of needs.

  • Choose from octagonal, round, micro or color-coded bars to best suit your needs
  • 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
F37160-0000 F37161-0000 F37162-0000 F37163-0000
Description OCTAGONAL BARS Six Octagon Spinbar Magnetic Stirring Bars, Teflon PTFE coated, with pivot ring ROUND BARS Six Round Spinbar Magnetic Stirring Bars, Teflon PTFE coated, with removable pivot rings "THINK SMALL” PACK Six Flea Micro Spinbar Magnetic Stirring Bars, Teflon PTFE coated COLOR-CODED BARS Six Octagon Spinbar Magnetic Stirring Bars, Teflon PTFE coated with pivot ring
Sizes (2 each) 1 x ⁵/₁₆" (25.4 x 8mm) 1½ x ⁵/₁₆" (38.1 x 8mm) 2 x ⁵/₁₆" (50.8 x 8mm) 1 x ⁵/₁₆" (25.4 x 8mm) 1½ x ⁵/₁₆" (38.1 x 8mm) 2 x ⁵/₁₆" (50.8 x 8mm) .315 x .059" (8 x 1.5 mm) .276 x .079" (7 x 2mm) .394 x .1184" (10 x 3mm) 1 x ⁵/₁₆" (25 x 7mm) * 2 Each Color Yellow, Red, Blue

Technical Details

Size: Assortment with Pivot Ring/Octogonal
  • Brand Name: Bel-Art Products
  • Part Number: 371630000
  • Material Type: PTFE (Polytetrafluoroethylene)
  • Number of Items: 6
  • Item Package Quantity: 1

Customer Questions & Answers

Customer Reviews

3.7 out of 5 stars
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Most Helpful Customer Reviews

2 of 2 people found the following review helpful By Terry Hebert on August 28, 2013
Size: Assortment with Pivot Ring Verified Purchase
Items are as described, using now for a yeast starters, being a home brewer. The kit gives plenty of options for different size flask and density of liquid.
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7 of 10 people found the following review helpful By Napalm on July 12, 2010
Size: Assortment without Pivot Ring Verified Purchase
The photo shows good-sized stir-bars, but in actuality, the LARGEST one was 1/4"! From the picture, I assumed the largest was 2". Be sure you want test-tube-sized stir bars!!
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Size: Assortment without Pivot Ring Verified Purchase
Tiny stir bars perfect for spinning 0.2 - 2.0 mL reactions in small tubes. Spinpack product works perfectly well. Supplier provides clear dimensions "Contains six stir bars, two each in the following sizes: 0.315 x 0.059" (8 x 1.5 mm), 0.276 x 0.079" (7 x 2 mm), 0.394 x 0.1184" (10 x 3 mm)". Use a ruler to check if these are a good fit for your application.
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2 of 3 people found the following review helpful By wzername on October 14, 2013
Size: Assortment with Pivot Ring Verified Purchase
Very weak little spinner.
Disappointing momentum = pitiful and inconsistent.
DId not return (repurposed in a junk drawer).
Keep looking…
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2 of 3 people found the following review helpful By Brad Coucher on July 11, 2013
Size: Assortment with Pivot Ring Verified Purchase
Title says it all. There's not much else to say. Good construction, standard packaging, and they spin like the aught to.
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By Paul Nel on June 18, 2014
Size: Assortment with Removable Pivot Ring Verified Purchase
Items are as described. Good quality product.

The two biggest stirbars are good for stirring big flask, ive used them successfully with 10L RBF.
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Size: Assortment with Removable Pivot Ring Verified Purchase
Excellent quality, built to last. I use these with a small VWR stirrer in a commercial R&D lab and they work great.
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Size: Assortment with Pivot Ring Verified Purchase
GOOD! The production is very good and it is worthy to own. I think you will love it !!! R
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Scienceware F371630000 Teflon (PTFE), Color-Coded, Octagonal Spinpak Magnetic Stir Bar Assortment, with Pivot Ring
This item: Scienceware F371630000 Teflon (PTFE), Color-Coded, Octagonal Spinpak Magnetic Stir Bar Assortment, with Pivot Ring
Price: $27.89
Ships from and sold by Amazon.com