Copper Foil and Strip
C1100 oxygen-free electrolytic copper at 99% IACS for transformer windings.
Power and Transformer Manufacturing
Winding conductor and core steel specified by conductivity and loss, not by weight.
A transformer's performance is decided by two material choices made once at design: the winding conductor and the core steel. Both then determine losses that run for the twenty or thirty year life of the unit. Copper foil at 99% IACS, aluminium foil at 63% IACS, enamelled magnet wire in copper or aluminium, and grain oriented and non-oriented silicon steel.
Sector pain points
What Goes Wrong In This Sector
Load Losses Unknown Until Test
Buying conductor without a conductivity figure means the loss performance of the finished transformer is unknown until the winding is already in the tank.
Brittle Joints After Brazing
Oxygen in copper embrittles the metal at winding joints. Oxygen-free electrolytic copper below 0.02% is what keeps them sound.
No-Load Loss Running for Decades
Core steel grade sets it, loaded or not. Over twenty years that compounds into a figure far larger than the material cost difference.
Material Qualification per Export Market
IEC, BIS and ASTM on the copper strip and four regional standards on the foil remove a qualification step per destination.
Strip Width That Does Not Match the Coil
Foil winding wants strip as tall as the coil. Widths to 1350 mm in copper and 1500 mm in aluminium cover most coils in one piece.
Insulation Class Arriving by Accident
Specifying magnet wire by diameter alone means the thermal class is whatever the supplier had, and the design temperature is then set by accident.
What buyers need
What This Sector Actually Asks For
- Conductivity and tensile figures published for every conductor
- Oxygen content and purity stated on copper, with certificates available
- Both copper and aluminium so the cost and weight trade-off is a calculation
- Standards compliance named explicitly for the destination market
- Inner diameters matched to existing winding mandrels
- Support through manufacturing, assembly, maintenance and repair
Product groups
Groups That Serve This Sector
Aluminium Foil and Strip
1050 1060 and 1070 alloys at 63% IACS for lighter transformer windings.
Enamelled Wire
Magnet wire in copper or aluminium with enamel or polyurethane insulation.
Silicon Steel
Cold rolled electrical steel under 2 mm in grain oriented and non-oriented grades.
CNC Machining Parts
Wire EDM, grinding, drilling and mill component manufacture to your drawing.
Sheet Metal Fabrication
Cutting bending welding assembly and coating under one roof, from prototype to production.
Recommended products
Where Most Buyers In This Sector Start
How we work with you
From Enquiry To Repeat Supply
Fix the Conductor Material
Copper at 99% IACS or aluminium at 63%. Published figures make it an arithmetic decision rather than a preference.
Match Strip Width to Coil Height
So the winding is made in one piece with no joint in the conductor.
Choose the Core Steel Grade
Grain oriented for transformer cores, non-oriented for rotating machines, with thickness set against target core loss.
Name the Applicable Standard
IEC, BIS, ASTM or a regional standard, on the purchase order rather than in conversation.
Request Material Certificates
Oxygen content, purity and conductivity, collected with the delivery for the project quality file.
Further reading
Guides For This Sector
Copper or Aluminium for Transformer Windings
63% IACS against 99% IACS. With both figures published, the choice between aluminium and copper foil becomes arithmetic at design stage rather than a matter of preference.
FAQ
Power and Transformer Manufacturing Questions
Copper or aluminium for the winding?
Copper gives 99% IACS against aluminium's 63%, so a smaller conductor section for the same current, at higher weight and cost. Both are supplied with published figures.
What copper purity do you supply?
Oxygen-free electrolytic copper with oxygen below 0.02% and purity of 99.95% or higher.
Which standards do your materials meet?
IEC, BIS and ASTM on the copper strip, plus American, European, German and Japanese standards on the copper foil.
Which silicon steel grade do we need?
Grain oriented for transformer cores where the flux path is fixed, non-oriented for motor stators and rotors.
What magnet wire sizes are available?
Flat conductor 0.8 to 5.6 mm thick and 2.00 to 16.00 mm wide at a 1.4:1 ratio, in copper or aluminium.
Do you supply repair shops as well as manufacturers?
Yes. Supply covers transformer manufacturing, assembly, maintenance and repairs.
Get A Recommendation For Power and Transformer Manufacturing
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