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Scienceware Teflon (PTFE), Dumbbell-Shaped Circulus Magnetic Stir Bar

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ASIN B007EZ3KVA

Specifications for this item
Material Type
PTFE (Polytetrafluoroethylene)
UNSPSC Code
41121802
Brand Name
Bel-Art Products

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Key Features

  • Dumbbell shape with a bar in the center and flat disks at the ends centers the bar during spinning and provides turbulence, helps prevent drifting, and reduces surface contact at high speeds
  • Teflon (PTFE) casing is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning
  • For stirring viscous and high-density liquids and fluids containing metal particles in containers with round or convex bottoms
  • Internal magnet made from alnico V, an alloy of aluminum, nickel, iron, and cobalt
  • Center bar is 0.315" (8 mm) in diameter and end disks are 0.79" (20 mm) in diameter

Product Description

The Bel-Art Scienceware Circulus dumbbell-shaped stir bar has a Teflon (PTFE) casing and an internal magnet made from alnico V (an alloy of aluminum, nickel, iron, and cobalt) for a range of laboratory stirring applications. The dumbbell shape has a bar in the center and flat disks at the ends to center the bar during spinning and provide turbulence, help prevent drifting, and reduce surface contact at high speeds. The magnet sits inside a Teflon (polytetrafluoroethylene, or PTFE) casing, which is chemically inert, can be used with corrosive chemicals, and helps reduce friction and wear while spinning. The center bar is 0.315" (8 mm) in diameter and the end disks are 0.79" (20 mm) in diameter. The casing material is FDA approved for use in food, drug, and cosmetic applications.

Magnetic stir bars (sometimes called stirring bars, spin bars, or fleas) are used to stir a liquid or solution in biological, chemical, medical, and research laboratory applications. The stir bar is placed inside a container of liquid or solution that is seated on a magnetic stirrer (also called a magnetic mixer), which is a laboratory device that creates a rotating magnetic field using a rotating magnet or multiple stationary electromagnets. The rotating magnetic field causes the bar to spin, which stirs the liquid or solution. Stirring bars are offered in a variety of sizes and shapes, and they are encased in materials such as glass or plastic to help prevent contamination of the liquid or solution, to reduce friction, and to provide resistance to chemicals, abrasion, and heat. The bar may have a pivot ring or pivot point to minimize contact with the container, reduce friction, and improve its spinning. The size and shape of the container and the volume and viscosity of the liquid or solution to be stirred determine which stir bar shape, size, and casing will suit a particular application.

Bel-Art Products manufactures scientific products, including labware, testing equipment, and safety supplies, under the Bel-Art and Scienceware brands. The company, founded in 1946, is headquartered in Wayne, NJ.

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