PTFE Stir Bars and Accessories

• Our stir bars feature… ALNICO V magnetic cores which are one of the most powerful permanent magnet alloys available.

• Stir bars should not… be stored in a random mass or dropped on a hard surface, especially steel.

• Stir bars should… be stored in pairs to maintain magnetic strength.

• In general… PTFE thickness accounts for 18% of stir bar diameter.

Stir bars are a magnetic bar placed in liquid that provides the stirring action driven by another rotating magnet in a stirring device that is below the vessel containing the liquid. Magnetic stir bars are commonly coated in PTFE and are intended to be chemically inert and do not contaminate or react with the reaction mixture they are in.

Stir bars are supplied in a variety of shapes including octagonal stir bars, egg shaped stir bars, round stir bars with ring and a variety of specialty shapes for more efficient stirring depending on the application. Color coded stir bars are offered in red, yellow and blue. Micro stir bars are among the smallest in size ranging all the way up to extra large stir bars. Disposable stir bars offer 
contamination free stirring at disposable prices and are offered in four sizes.