1070 Aluminum Foil: Ideal Material for Transformer Manufacturing

1070 aluminum foil has long stood as the most reliable and cost-effective core material for moderntransformer manufacturing. Featured with ultra-high purity, superior electrical conductivity, excellent thermal conductivity and outstanding formability, 1070 grade aluminum foil is widely applied in low and medium-voltage transformer winding, power transformer production, and electrical energy conversion equipment. Compared with other aluminum alloys and copper materials, it perfectly balances electrical performance, production efficiency and operational cost, making it the ideal choice for mass transformer manufacturing.

Application Advantages of 1070 Aluminum Foil in Transformer Manufacturing

1. Application in Foil-Wound Transformers

Its smooth surface, precise dimensional tolerances, and burr-free edges allow the foil to remain flat and tightly wound during the high-speed automatic winding process, ensuring the structural stability of the coil. In dry-type transformers, which rely on air convection for cooling, the use of 1070 aluminum foil effectively improves heat dissipation efficiency, ensuring stable operation of the transformer.

2. Significant Economic Benefits

Using 1070 aluminum foil for transformer windings can reduce the manufacturing cost of transformers by about 15%.

3. Superior Medium-Frequency Performance and High Power Density

At medium frequencies, the lower conductivity of aluminum reduces eddy current generation, resulting in more uniform current distribution and lower AC winding losses.   

Technical Parameters and Quality Control

To ensure 1070 aluminum foil meets the demanding requirements of transformer manufacturing, strict control is exercised over its various technical parameters:

Alloy Composition: Aluminum content ≥ 99.7%, with strict limits on impurities such as Si, Fe, Cu, Mn, Mg, Zn, Ti, V, etc.

Temper: Commonly supplied in the O  state to ensure optimal formability.

Thickness Tolerance: For foils with thicknesses between 0.2 and 3.0 mm, the thickness tolerance is strictly controlled within ±0.02 to ±0.08 mm.

Width Tolerance: Depending on the width, it is controlled within ±0.10 to ±2.00 mm.

Edge Quality: Requires no burrs, with edge chamfering (rounded edges) to ensure insulation between layers and operator safety. The burr height is generally controlled below 0.03 mm.

Surface Quality: The surface is smooth, flat, and free of scratches, oil stains, and oxide spots.

1070 Aluminum Foil Supplier - Mingtai Aluminum 

As a leading aluminum rolling manufacturer in China, Mingtai Aluminum has accumulated extensive production experience in the field of transformer aluminum foil. We fully understand the stringent requirements of transformer windings regarding electrical conductivity, edge quality, and flatness tolerances. From melting, casting, and rolling to precision slitting, every step is strictly controlled under ISO 9001 and IATF 16949 quality management systems. Each coil of 1070 aluminum foil undergoes spectroscopic analysis, conductivity testing, and edge burr inspection before leaving our factory, ensuring trouble-free performance during high-speed automatic winding—no breakage, no deviation. Choosing Mingtai means not only receiving high-purity aluminum foil that meets ASTM B209 and GB/T 3190 standards, but also gaining a reliable partner who truly understands transformer manufacturing processes.