Dry drum magnetic separators are excellent tools for separating ferromagnetic and paramagnetic components from nonmagnetic powders.  The low intensity drum has a magnetic field from 600 to 1,000 gauss, typically and is used when separating ferromagnetics. The high intensity drum typically has magnetic field intensity ranging from 7,000 gauss (Permanent Drum) to 20,000 gauss (Electro-magnetic drums) and are used to remove paramagnetic components.