- Save 20% each on Belart 20% off offered by Amazon.com when you purchase 1 or more. Here's how (restrictions apply)
Other Sellers on Amazon
+ Free Shipping
Bel-Art Spinplus Teflon Magnetic Stirring Bar; 38.1 x 15.8mm, White (F37144-0112)
Get free shipping
Free 5-8 business-day shipping within the U.S. when you order $25 of eligible items sold or fulfilled by Amazon.
Or get 4-5 business-day shipping on this item for $5.99. (Prices may vary for AK and HI.)Learn more about free shipping
- Make sure this fits by entering your model number.
- Cross shape (also called a star shape or a plus shape) creates a vortex to the bottom of the container and provides more stability and less vibration than single-bar shapes
- 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 alnico V, an alloy of aluminum, nickel, iron, and cobalt
- Casing material is FDA approved for use in food, drug, and cosmetic applications
|Number of Items||1|
|Size||1-1/2 x 5/8" (38.1 x 15.8mm)|
Specification for this product family
|Brand Name||SP Scienceware|
Frequently bought together
What other items do customers buy after viewing this item?
Customers who bought this item also bought
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-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|
Cross Spinplus Magnetic Stirring Bars
Cross Spinplus Magnetic Stirring Bars
Spinplus magnetic stirring bars add speed and efficiency to mixing operations.
- The '+' shape creates a deep vortex and provides stable, quiet operation
- 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
Teflon-encased, Alnico V magnets in “Starburst” configuration to provide stronger mixing vortex than conventionally shaped stirring bars.
Size: 1-1/2 x 5/8" (38.1 x 15.8mm)
Would you like to tell us about a lower price?
Top customer reviews
There was a problem filtering reviews right now. Please try again later.
With this one, I almost never have to worry about it getting thrown. Once it's lined up and spinning, it's rock solid. As a bonus, I don't need as much speed to create a vortex either. It's the only stir bar I use any more. Seriously, why are you still reading? Buy this one, it's awesome!
I find this reliable to mix up to 500 ml, but over that I use a larger straight triangular stir bar for volumes up to 2 liters.
After testing a regular shaped spin bar with this one, I've decided that it works really well by comparison. With the non cross shaped stir bar I couldn't get a vortex going, but with this one I can get a vortex. As long as you keep it below 500 RPM it produces a nice vortex. With the rod shaped stir bar it wouldn't go more than 300 RPM and would not produce a vortex.
An octagonal stirrer bar 50x8mm from Fisher labs managed to stay in sync at higher RPM.
Nonetheless if you don't care about running it at high RPM, then you can expect to see a nice vortex.