Amorphous metals (VITROVAC®)

Extremely fast solidified tapes, used for special chokes and research applications.

Nanocrystalline alloys (VITROPERM®)

High saturation induction, high permeability and optimum HF behavior. Available in many sizes and coatings.

Crystalline alloys (ULTRAPERM®)

Today mostly replaced by nanocrystalline materials, but remain important for special applications.

Properties of materials for toroidal tape cores
Designation Composition μmax
(50 Hz)		 μi
(10 kHz)		 HC
[A/m]		 BS
[T]		 TCurie
[°C]		 Density
[g/cm³]
ULTRAPERM® 250** 80 % NiFe 400000 - 0,3 0,78 400 8,7
VITROPERM® 800 F Fe nano 150000 - 0,5 1,20 600 7,35
VITROPERM® 500 F Fe nano - 20000...100000* 0,5 1,20 600 7,35
VITROPERM® 250 F Fe nano - 4000 1,0 1,20 600 7,35
VITROPERM® 500 Z Fe nano - - 0,5 1,20 600 7,35
VITROVAC® 6025 Z Co amorphous - - 0,3 0,56 240 7,7
* Permeability level is adjusted by heat treatment
** Largely substituted by nanocrystalline RBK