Specialist for magnetic shielding, magnetic materials, tape cores and magnet systems including hydrogen annealing and magnetic field measurement technology

SEKELS GmbH

DieburgNew on Amplifa

GmbHLegal form

Headquarters in DieburgLocation

Hydrogen furnacesKey equipment

Helmholtz coils up to 2 m in diameterMeasuring equipment

About SEKELS

SEKELS GmbH is a specialist for magnetic fields, magnetic materials, magnet systems and magnetic shielding – from consulting to the delivery of finished components and systems. The company calculates, develops and manufactures shields and shielding systems against low-frequency magnetic fields, including heat treatment and magnetic testing. From extensive stockholding of NiFe and CoFe alloys (80 % NiFe, 50 % NiFe, 50 % CoFe, 3 % SiFe) in various dimensions, the company performs conversion and parts manufacturing, as well as the production of core laminations and lamination stacks in standard and special dimensions. Toroidal tape cores and cut tape cores are made from nanocrystalline (VITROPERM®), amorphous (VITROVAC®, METGLAS®) and crystalline alloys. Modern hydrogen furnaces enable the magnetic final heat treatment as well as soft annealing of stainless steels. The portfolio is complemented by the design of magnet systems (prototype and series), measurement of the shielding factor in Helmholtz coils up to 2 m in diameter, on-site magnetic field measurements, the in-house developed MFA-110 measuring system, and the distribution of products from VACUUMSCHMELZE GmbH & Co. KG. Customers include companies from electromobility, life sciences/microtechnology as well as research and diagnostics.

Site: Dieburg
Processes: Calculation, development and manufacturing of magnetic shields and shielding systems against, Conversion and parts manufacturing from magnetic semi-finished products, Annealing under hydrogen (magnetic final heat treatment, soft annealing of stainless steels), Manufacture of toroidal tape cores and cut tape cores, Design, engineering and manufacturing of magnet systems (prototypes and series), Measurement of the shielding factor in Helmholtz coils (up to 2 m in diameter), on-site magnetic, Manufacture of core laminations and lamination stacks in standard and special dimensions, Design and manufacturing of magnetic shields
Materials: 80 % NiFe alloy, 50 % NiFe alloy, 50 % CoFe alloy, 3 % SiFe alloy, VITROPERM® (nanocrystalline alloy), VITROVAC® (amorphous alloy), METGLAS® (amorphous alloy), Stainless steel
Certificates: Magnetic testing (shielding factor, Helmholtz coils), On-site magnetic field measurements, Measurement of magnetic material properties
Industries: Electromobility, Life Sciences / Microtechnology, Research and diagnostics

01
Consulting and design
02
Stockholding of magnetic semi-finished products
03
Conversion and parts manufacturing
04
Manufacture of toroidal and cut tape cores
05
Annealing under hydrogen
06
Magnetic testing and measurement technology
07
Assembly and delivery of systems

Materials & Processes

NiFe-80

80 % NiFe alloy

Magnetically soft semi-finished product for shields, core laminations and lamination stacks, held in extensive stock.

NiFe-50

50 % NiFe alloy

Material for magnetic parts and lamination stacks in standard and special dimensions.

CoFe-50

50 % CoFe alloy

High-saturation alloy for magnetic semi-finished products, parts manufacturing and heat treatment.

SiFe-3

3 % SiFe alloy

Electrical steel for core laminations and lamination stacks.

VITROPERM

VITROPERM® (nanocrystalline alloy)

Material for toroidal tape cores and cut tape cores with high permeability.

VITROVAC

VITROVAC® (amorphous alloy)

Amorphous ribbon material for tape cores.

METGLAS

METGLAS® (amorphous alloy)

Amorphous alloy for toroidal and cut tape cores.

Edelstahl

Stainless steel

Soft annealing with sensitive surface in the hydrogen furnace.

Wasserstoffglühen

Annealing under hydrogen

Magnetic final heat treatment according to manufacturer specifications or in-house developed temperature profiles.

Locations

Dieburg

Headquarters with manufacturing, heat treatment and measurement technology

Materials: NiFe, CoFe and SiFe alloys, VITROPERM®, VITROVAC®, METGLAS®, stainless steel

Hydrogen furnaces
Helmholtz coils (up to 2 m in diameter)
MFA-110 measuring and analysis system for magnetic fields

Components & Products

**Magnetic shielding**Calculation and manufacturing · Electronics/Research

**Magnetic semi-finished products and parts**Conversion · Mechanical engineering

**Toroidal tape cores and cut tape cores**Tape core manufacturing · Electrical engineering

**MFA-110 measuring and analysis system**Measurement technology · Research

Inside the production

Thermal image of the final annealing in the hydrogen furnace

Stockholding of magnetic semi-finished products

Project on the sustainable use of lithium-ion batteries

Industries

ElectromobilityLife Sciences / MicrotechnologyResearch and diagnostics

Processes & technical limits

Processes	Tolerance	Max. part	Weight	Lot size	Materials
Calculation, development and manufacturing of magnetic shields and shielding systems againstEngineering	–	–	–	–	NiFe alloys, CoFe alloys
Conversion and parts manufacturing from magnetic semi-finished productsMachining	–	–	–	–	80 % NiFe, 50 % NiFe, 50 % CoFe, 3 % SiFe
Annealing under hydrogen (magnetic final heat treatment, soft annealing of stainless steels)Heat treatment	–	–	–	–	NiFe alloys, CoFe alloys, Stainless steels
Manufacture of toroidal tape cores and cut tape coresForming	–	–	–	–	nanocrystalline alloys (VITROPERM®), amorphous alloys (VITROVAC®, METGLAS®), crystalline alloys
Design, engineering and manufacturing of magnet systems (prototypes and series)Engineering	–	–	–	–	–
Measurement of the shielding factor in Helmholtz coils (up to 2 m in diameter), on-site magneticTesting	–	–	–	–	–
Manufacture of core laminations and lamination stacks in standard and special dimensionsForming	–	–	–	–	80 % NiFe, 50 % NiFe, 50 % CoFe, 3 % SiFe

3 Anlagen & Maschinen

Machine	Manufacturer / model	Quantity	Working area	Year built	Site
Hydrogen furnace (annealing furnace)	–	–	–	–	–
Helmholtz coils (measuring system for shielding factor, up to 2 m in diameter)	–	–	Diameter up to 2 m	–	–
Measuring and analysis system for magnetic fields	SEKELS MFA-110	–	–	–	–

Additional services

Design and manufacturing of magnetic shieldsConversion and parts manufacturingHeat treatment/annealing under hydrogenMagnetic testingMeasurement of the shielding factor in Helmholtz coils (up to 2 m in diameter)On-site magnetic field measurementsDesign and manufacturing of magnet systems (prototype and series)Distribution of VAC productsInductive componentsMeasurement technology (MFA-110)

Reference customers

VACUUMSCHMELZE GmbH & Co. KG (distribution partnership)

Quality

The shielding factor is measured in Helmholtz coils with diameters of up to 2 m; in addition, SEKELS offers on-site magnetic field measurements as well as measurement of magnetic material properties.

Evidence	Dieburg
Magnetic testing (shielding factor, Helmholtz coils)
On-site magnetic field measurements
Measurement of magnetic material properties

History

2023
Expansion as a distributor of VACUUMSCHMELZE GmbH & Co. KG into a new market
2024
Strategic partnership with the company Lefeng in China
2025
Part of an innovative project on the sustainable use of lithium-ion batteries