Anodized aluminum strips and foils (anoxal)

We are manufacturers of anodized aluminum strips and foils (anoxal), which is used as a particularly high-performance conductor material, especially for the construction of electromagnets, generators and transformers. It is extremely thin, particularly thermally conductive and temperature-resistant.

The extremely thin layer of insulation from anoxal results in high dielectric strength and optimum thermal conductivity. There are no hot spots, and the resilience increases, since anoxal can be used at a permanent temperature of 500°C – copper windings are only temperature-resistant up to 180°C.

A weight reduction of up to 50% with a similar size and comparable electrical properties compared to copper coils is possible with anoxal.

The use of anoxal in AC applications as well as for DC applications is guaranteed.

Anodized aluminum strips / foils application and benefits

Areas of application

  • Electromagnets
  • Generators
  • Transformers
  • Choke coils

Product benefits

  • very resistant to high temperatures
  • 50% weight reduction compared to a copper coil with comparable electrical properties
  • no "hot spots" inside the coil due to high heat dissipation, therefore no additional insulation required
  • coils made of anoxal do not require more installation space than copper coils with comparable electrical properties
  • insulation class C

Physical properties and options

Conductor material

Al material
EN AW-Al 1050, EN AW-Al 1070 or EN AW-Al 1350

Al melting point

2.7 kg/dm3

Average spec. heat capacity (1-100°C)
0.92 J/g x K

Average coefficient of thermal expansion
23.5 x 10-6/K

Thermal conductivity
2.3 W/cm x K

Temperature coefficient of the electr. resistance (1-100°C)
0.004 K-1

Tensile strength
70 to 180 N/mm2

electr. conductivity
min. 34.5 MS/m (at 20°C, O soft)

Young modulus
7 x 10-4 N/mm2 (average)


Oxide layer thickness
1 to 6 μm (depending on the required insulation)

Turning strength
20 V/μm

Chem. composition

Melting point
approx. 2000°C

250-350 HV

Dielectric constant

low wear and tight grip


Strip/foil thicknesses
Foils: 0.050 to 0.200 mm according to DIN 546
Strips: 0.200 to 2.000 mm according to DIN 485
other thicknesses on request

Tape widths
3 to 400 mm
other thicknesses on request

Inner diameter
300 or 400 mm; on sleeve

Outer diameter
max. 1100 mm

according to customer requirements; running lengths also available

The data in this technical product information is based on our current knowledge and experience. Due to the abundance of possible influences during its application, it does not release the processor nor the user from performing their own tests and trials. A legally binding guarantee of certain properties or of suitability for a specific purpose cannot be derived from our information. Depending on the individual case, we recommend consulting with us. Any property rights and existing laws must be observed by the recipient of our products under their own responsibility.