Iron Cores FIAT 792

By F.R. Hensel

Joint Intelligence Objectives Agency

4 April 1946


Field Information Agency, Technical


This report covers only the, in our perception, relevant pages.



German methods for the manufacture of low hysteresis iron and iron-nickel powder cores are given. Special emphasis is placed on insulation and bounding. manufacturing details and theoretical consideration of hysteresis are given in tabular form at the end of the report.


Keywords:    Siemens & Halske AG Werner Werk; A.E.G. Berlin; Vogt and Co, Berlin;  The main producers in Germany were Siemens Berlin - AEG Berlin - Vogt & Co, Metallpulverwerke Berlin - Neosid berlin - Dralowid, Steatiti-Magnesia Teltow berlin - Görler Berlin - Bosch Stuttgart - Felten & Guillaume Köln ... ; Siemens & Halske the raw material for iron Pupin cores at Siemens was exclusively iron carbonyl powder purchased from I.G. Farben .... the grain size of the powder ranges from 5-10 microns. The H powde was of particular fine grain size ... ; Bakkelite Mixtures The material used is bakelite and 50% percent ethyl alcohol solution. Porcelain powder is added for "y". The mixture is run cold. ...; .... The binder as well as the insulating material was Trolitul which is a Polystyrene. Trolytul is the trade name of a plastic produced by the firm Dynamit A.G. Troisdorf Köln .... ;  Production Pupin cores; High-Frequency cores; A.E.G. Berlin, Insulation of Powders AEG uses extensively sodium silicate (water-glass) and synthetic resins ... ; Vogt & Co Vogt uses exclusively carbonyl iron for his cores. ... The hard iron particles retain the globular shape in pressing, thereby making contact with each other only on a few points and retaining a high Q value .... ; Cores from soft iron powders are used up to frequencies of 100,000 cycles with ring permeability values of 15-55. Cores from hard iron powders are used from 100,000 cycles to 15 megacycles with ring permeability values of 5-15 ... ; Mixing D-powder - Sirufer 4 .... ... ; Hysteresis .... ; Measurements of the Busch-compensator .... ; Angle of hysteresis loss .... 

Mixture Siemens Designation:

Fx 55

Az 49


Dz 18d

Kz 14e

Krz 12

Krv 12

Ky 7

Kz 7

D Po 6

D 6

High-Frequency iron

HF - A1

HF - A2

HF - B1

HF - B3

HF - C1

HF - C2

HF - C3

HF - C4

FH - C6

HF - D3

HF - Z1

HF - Z2

Low-frequency iron

NF -a1

NF - a2

NF -a3

Band iron cores of 40% nickel iron

Isoperm Cu 55-69

Isoperm Cf 80-100

Nicalloy 90-150

Magnetic materials












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