Alloy Powder Cores

US $200.00



Alloy Powder cores are made of “iron alloy” powders mixed with epoxy resins, which is compressed at high pressure to form toroids, pot cores etc. Their permeability ranges 10 to 600 and saturation flux density ranges 0.7 to 1.6 T.  They are mainly used in inductors and transformers in power electronics industry.

Of these, MPP (made from 80% Ni Steel powders)  offer lowest core losses, but has lower flux capacity (Js ~0.75T).  Koolmu also offers competitively low core loss. Xflux (made from high Si steel) has the highest saturation flux density (Js~ 1.6T), but produces highest losses. Amoflux (made by powdering Metglas ribbon) offers 50% lower loss than HiFlux (made from 50% Ni Steel).   Most alloy powder cores can operate up to 200 C, excepting Amoflux which is limited to 155 C.

Several firms produce powder cores of same composition. But the coreloss and B(H) curves are sensitive to trace impurities, even if the composition is same. So MagWeb lists the properties of alloy powder cores produced by each firm, irrespective of they being of same composition.

MagWeb’s Alloy Powder Core Folder has 92 excel files listing magnetic properties of these materials, produced by 3 manufacturers.  Of these, 28 files contain B(H) magnetization curves/permeability curves while 62 files contain core loss curves.  For a full list of commercial names of all these materials, please click on List of Materials – J. Alloy Powder Cores.  

Version 5 also contains a DIGEST file which lists all these materials and their magnetic properties in a single file.

By downloading this folder you will have 92 files on magnetic properties of all alloy powder cores at your finger tips!  

Please review the Handbook for more technical information on the magnetic properties of these materials.  

This website is designed for instant download of Folders (containing the magnetic property files) via credit card. If you wish to purchase via quote/purchase order, please email to


Additional information


Image, Excel