Stirring Bars and Rods
Products of various sizes, shapes, and material compositions designed to aid in manual or automatic stirring of laboratory solutions. Includes glass stirring rods, magnetic stir bars, and stir bar retrievers.
What Is a Magnetic Stir Bar?
Magnetic stir bars are stirrers or stirring hotplates used with magnets to mix a liquid or solution by creating a vortex.
A number of factors affect magnetic stir bar efficiency and effectiveness, including its size, shape, and material. Sizes (L x Diameter) range from 2 x 2 mm to 159 x 27 mm and shapes include:
- Polygonal or octagonal magnetic stir bars are the most common shapes; the multiple surfaces add turbulence to the mixing action
- Elliptical or egg-shapped stir bars work especially well with round-bottom flasks
- Wedge-shaped spin bars produce more significant turbulence for dissolving salts or in samples containing sediment
- Spin bars with fins or vanes, designed for smaller vessels, tubes, or cuvettes
- Micro (“flea”) stir bars for mixing extremely small samples
What Kind of Magnet Is Used?
Stir bar magnets are typically made from Alnico, a combination of aluminum and nickel. They may also be made from Samarium cobalt, a rare earth metal that produces the stronger magnetic force needed to mix very viscous substances.
Stir bar magnets are usually encapsulated in white or colored PTFE, hard plastic, or borosilicate glass, and coatings may meet FDA grade or USP requirements. PTFE is durable, inert, and can be autoclaved. Glass-encased cylindrical magnets are useful for high-temperature applications.
How Does It Work?
During the stirring process, integral or removable pivot rings on the stir bar reduce contact with the vessel to help avoid marring plastic surfaces. Some round stir bars have slightly raised ends that create a de facto pivot point, while others have more pronounced round centers that help to keep them in motion. Stir bars may be reusable or disposable.
Magnetic stir bars may be sold individually or in magnetic stir bar kits that include multiple bars in a range of sizes.
Ace Glass, Inc. PTFE baffle, 6.4mm diax175mm length shaft. Fits #7Ace-Thred adapter. Baffle dimensions-18mmx152mmx10mm, 327mm overall length.
18mm X 152mm X 10mm PTFE Baffle. Overall length: 327mm. Use with #7 Ace-Thred adapters to mate glass or PTFE (stainless steel core) baffles to any standard taper joint. Baffles can be adjusted vertically, or rotated to increase agitation.
Biotage Magnetic Stir Bars, for 2-5 mL Microwave Reaction Vials 25/Case
Biotage Magnetic Stir Bars, for 2-5 mL Microwave Reaction Vials 25/Case
Ace Glass, Inc. Baffle, PTFE, fits #11 Ace-Thred, 330mm long, 18x150x10 baffle, can take 1/4in OD temp probe up to 500mm length.
18x150x10 PTFE baffle with an integral stainless steel tube. Can be used for either liquid addition into a reactor, or primarily as a temperature probe. Baffle fits a #11 Ace-Thred and is 330mm long. Baffle can take a 1/4 O.D. temperature probe that is up to 500mm long. The #7 Ace-Thred bottom bushing will make a tight compression seal with either the tubing or a thermocouple.
Perkin Elmer US LLC Magnetic Stirrer Fleas - Qty. 6
The Magnetic Stirrer Fleas, also called stirring beads, are required with the Quartz SUPRASIL Fluorescence Cells for Magnetic Stirrers (B0631132), but they need to be order separately. With this part number, they are also available as a replacement or spare set. Qty. 6 beads per package.
Ace Glass, Inc. Stirbar, PTFE, octagonal, blue, 12.7mm x 3.2mm
12.7mm x 3.2mm blue octagonal PTFE stirbar with pivot ring.
Cowie Technology Corporation MICRO STIRBAR 8MM L 3MM D
This item has a minimum order quantity of 152 per supplier requirements. Stirbar, micro, length 8 mm, diameter 3 mm
Chemglass Life Sciences Stir Bar, Magnetic, Egg-shaped, fits 2000mL-3000mL flask, Length x Dia. in inches: 2 x 3/4
Stir Bar, Magnetic, Egg-shaped, fits 2000mL-3000mL flask, Length x Dia. in inches: 2 x 3/4. Egg-shaped magnetic stirring bar provides its own pivot point without separate ring or abrupt change in contour. Designed for use in round bottom vessels, it is shaped to spin freely, unrestricted by the vessel contour. Manufactured with FDA-grade and USP Class VI PTFE.SEE CG-2005-20 FOR STIR BAR KIT
Grainger Winch Bar 34 L Steel Painted
The ANCRA Winch Bar is a steel pry bar made in the USA. It has a hexagonal cross section and measures 36 inches long with a 1-1/8 inch diameter. The winch bar features a beveled chisel point on one end and a flat pry end on the other. It is designed for heavy duty prying applications and can provide up to 5,000 lbs of prying force. The durable steel construction allows for prying, scraping, chiseling, loosening nuts/bolts, and demolishing. This versatile tool is ideal for automotive, industrial, construction, and agricultural uses.
Cowie Technology Corporation OVAL STIRBAR 35MM L 16MM D
This item has a minimum qty of 33 per supplier requirements.
OVAL STIRBAR 35MM L 16MM D
Cowie Technology Corporation CROSS STIRBAR 25MM L 9MM D
This item has a minimum qty of 46 per supplier requirements.
Stirbar, cross, length 25 mm, diameter 9 mm
Grainger Winch Bar 34 L Steel Chrome
The ANCRA Winch Bar 16V907 is a heavy duty winch bar made of high strength steel with a black powder coat finish. It has a working load limit of 5,000 lbs and measures 48 inches long with a 1 inch diameter. The winch bar features a hook on one end and a chisel point on the other end for prying, lifting and pulling. It can be used with most standard winches and comes with a limited lifetime warranty from the manufacturer. This rugged winch bar is ideal for off-road recovery and industrial pulling applications.