What does 'RE' mean in a stirring bar description? Rare earth? What are rare earth stirring bars?
FAQ from Radleys
'RE' in the product name of a magnetic stirring bar stands for rare earth.
Rare earth magnets provide significantly increased magnetic strength compared to standard magnets - stronger attraction between the stirring bar and the hotplate.
They are useful for stirring viscous samples.
Rare earth magnets are also almost completely resistant to demagnetisation.
Rare earth stirring bars are usually identified by a (chemically inert) black spot.