10,000 Gauss (1 Tesla) Grate Magnets have become a default standard for many food industry iron removal applications. That is because 10,000 to possibly 13,000 is the current limit with neodymium magnet material in 25 mm diameter tubes.
However, larger, 75mm diameter tubes can be featured in Grate-type Magnets for use with difficult flow products and 12,000 Gauss or more is easily achieved. Examples of products for which these special Grate Magnets may used are grapes being fed to crushing systems in wineries, or some flours which bridge or do not flow easily.
Large diameter tube grate magnets in easy-clean and even self-clean style are available from Serpent & Dove—Applied Magnetics Pty Ltd.