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SP Bel-Art Spinbar Teflon Polygon Magnetic Stirring Bar; 25 x 6mm, White, Pivot Ring (F37122-0025)

Amazon.com Price: $12.00$13.63 (as of 02/02/2023 10:12 PST- Details)

Material Polytetrafluoroethylene
Brand SP Bel-Art
Item Dimensions LxWxH 4 x 3 x 0.75 inches
Color White
Shape Polygon

About This Item

  • Polygonal shape is smoother than an octagonal shape and creates more turbulence and a stronger vortex than a round, cylindrical shape
  • Teflon (PTFE) casing is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning
  • Built-in pivot ring helps reduce vibration and wear during stirring
  • Internal magnet made from alnico V, an alloy of aluminum, nickel, iron, and cobalt
  • Casing material is approved for use in food, drug, and cosmetic applications

Product Specifications

Ean 7806382247209
Item Diameter 6 millimeters
Item Weight 0.160 ounces
Length 25 millimeters
Model Number 371220025
Number of Items 1
Part Number 371220025
Size 1 x 1/4″ (25 x 6 mm)
UNSPSC Code 41120000

Specification For This Product Family

Brand Name SP Bel-Art
Color White
Item Shape Polygon
Material Polytetrafluoroethylene
Part Number 371220070
UNSPSC Code 41000000

 

Product details

  • Product Dimensions ‏ : ‎ 4 x 3 x 0.75 inches; 0.16 Ounces
  • Item model number ‏ : ‎ 371220025
  • Date First Available ‏ : ‎ November 3, 2009
  • Manufacturer ‏ : ‎ Bel-Art
  • ASIN ‏ : ‎ B002VBW6J4
  • Country of Origin ‏ : ‎ USA
  • 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

Best Sellers Rank

  • #159,165 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • #16 in Lab Stirrer Bars
  • #133 in Lab Stirrers

Product Description

Size:1 x 1/4″ (25 x 6 mm) Size:1 x 1/4″ (25 x 6 mm) Plastic container surfaces are less prone to being scratched or marked by the spinning bar. Multifaceted surface transfers more torque to the liquid being stirred when compared to non-faceted cylindrical stir bars of the same size. Features center molded pivot ring for reduced friction and chattering. Research, industrial and healthcare professionals rely on SP Scienceware for their sample handling needs. Sold worldwide, Bel-Art and H-B Instrument brand laboratory supplies include over 5,000 items from safety wash bottles to fume hoods, thermometers, racks, desiccators, hydrometers, ice buckets, scoops and spoons. Custom calibration services, plastic molding, specialty coatings and wire manufacturing are also available. Wilmad-LabGlass brand laboratory glassware complements Bel-Art and H-B Instrument with over 7000 items including NMR and EPR consumables and specialty glassware, as well as custom fabrication for individual glassware, glass repair services and OEM glass parts. SP Scienceware is a division of Warminster, PA based SP Industries which also include SP Scientific laboratory, thermal management, and pharmaceutical production equipment and SP Ableware aids for daily living.


From The Manufacturer

Magnetic Stirring, selecting a magnetic stirbar
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
Polygon Spinbar, magnetic stirring bars
Polygon Spinbar Magnetic Stirring Bars

Polygon Spinbar Magnetic Stirring Bars

These stirbars have polygon multifaceted surfaces that add turbulence relative to similar smooth size cylindrical bars.

  • Center molded pivot ring minimizes the contact area between the bar and the vessel; reduces friction and chattering
  • Marring of plastic containers is diminished
  • 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
  • Autoclave safe
F37122-0012 F37122-0020 F37122-0025 F37122-0035 F37122-0040 F37122-0045
Size ⁷⁄₁₆ x ³⁄₁₆” (12 x 4.5 mm) ¾ x ¼” (20 x 6 mm) 1 x ¼” (25 x 6 mm) ¹³/₁₆ x ¼” (35 x 6 mm) 1⁹/₁₆ x ⁵⁄₁₆” (40 x 8 mm) 1¾ x ⁵⁄₁₆” (45 x 8 mm)
F371220050 F37122-0060 F37122-0070
Size 2 x ⁵⁄₁₆” (50 x 8 mm) 2⅜ x ⅜” (60 x 10 mm) 2¾ x ⅜” (70 x 10 mm)
Brand

SP Bel-Art

Ean

7449833242608 , 0191634007920, 7806382247209

Color

White

Product Dimensions

4 x 3 x 0.75 inches

Diameter

10 millimeters, 6 millimeters, 8 millimeters

Shape

Polygon

Size

1 x 1-4" (25 x 6 mm), 1-9-16 x5-16" (40 x 8 mm), 2 x5-16" (50 x 8 mm), 2-3-4 x 3-8" (70 x 10 mm), 2-3-8 x 3-8" (60 x 10 mm), 3-4 x 1-4" (20 x 6 mm)

Weight

0.160 ounces, 0.705 ounces, 1.06 ounces

Length

25 millimeters, 40 millimeters, 50 millimeters, 70 millimeters

Model Number

371220025, 371220040, 371220050, 371220070

Number of Items

1

Part Number

371220025, 371220040, 371220070

UNSPSC Code

20120000, 41000000, 41103800, 41120000

UPC

191634007920

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21P6DcpihEL. SS300SP Bel-Art Spinbar Teflon Polygon Magnetic Stirring Bar; 25 x 6mm, White, Pivot Ring (F37122-0025)
Amazon.com Price: $12.00$13.63 (as of 02/02/2023 10:12 PST- Details)Select options
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