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Transformer Aluminum Strip (also known as Aluminum Belt or Foil for Transformer Winding) is a high-purity aluminum flat strip designed for dry-type and oil-immersed transformers, radiators, and cable shielding.
It serves as a conductor material in transformer windings, replacing traditional copper windings for better cost-efficiency and lighter construction, while maintaining excellent electrical conductivity and thermal performance.
With smooth surface quality, tight tolerances, and stable mechanical and electrical properties, this product ensures high reliability in power transmission, cooling, and cable protection systems.
| Parameter | Specification / Range | Description |
|---|---|---|
| Alloy Grades | 1050 / 1060 / 1070 / 1350 / 3003 / 8011 | ≥99.6% purity, excellent conductivity |
| Temper | O (Annealed) / H14 / H24 | Ensures superior ductility and winding flexibility |
| Electrical Conductivity | ≥61% IACS | Low resistive loss for high-efficiency operation |
| Thickness Range | 0.2 – 3.5 mm | Meets transformer winding and fin stock standards |
| Width Range | 10 – 1350 mm | Custom narrow or wide strip formats available |
| Resistivity | ≤0.02825 Ω·mm²/m | Stable under high current loads |
| Edge Burr | ≤0.02 mm | Smooth edges to protect insulation |
| Surface Quality | Clean, oxide-free, burr-free | Ideal for paper or film insulation wrapping |
Transformer aluminum strips are wrapped with insulation materials such as Kraft paper, NOMEX paper, polyester film (Mylar), or fiberglass cloth to form HV and LV windings.
The high-purity aluminum conductor provides excellent conductivity and thermal dissipation, while the insulation layers ensure dielectric integrity and prevent short circuits.
(Illustration: Aluminum strip winding process on dry-type transformer with insulating layers)
Kraft Paper – economical, widely used for oil-immersed transformers
NOMEX Paper – high-temperature resistance and excellent dielectric strength
Polyester Film (Mylar) – smooth surface and reliable mechanical durability
Fiberglass Cloth – used in high-voltage transformers and reactors
| Property | Copper | Aluminum |
|---|---|---|
| Electrical Conductivity (IACS) | 100% | ~61% |
| Density | 8.9 g/cm³ | 2.7 g/cm³ |
| Weight | Heavy | ~⅓ lighter than copper |
| Cost | High | 30–50% lower material cost |
| Coil Size (for same current) | Smaller | Larger (due to resistivity) |
| Formability | Moderate | Excellent — easy to wind and bend |
| Corrosion Resistance | High | High (with insulation wrapping) |
| Thermal Expansion | Lower | Slightly higher — manageable in design |
✅ Aluminum strip offers lighter weight, lower cost, and high electrical performance, making it ideal for distribution and dry-type transformers.
When properly insulated, its service life and reliability equal or exceed that of copper windings.
Used in power, distribution, and dry-type transformers for both high-voltage (HV) and low-voltage (LV) windings.
Provides efficient conductivity and thermal management.
Available in various widths and insulation materials per winding design.
Aluminum strips and belts are ideal for radiator fins, HVAC condensers, and heat exchanger systems,
providing lightweight, corrosion-resistant, and thermally conductive components for automotive and industrial cooling.
Used as shielding, wrapping, or grounding belts in power cables and communication lines, offering excellent conductivity and electromagnetic protection.
High electrical conductivity & stability for efficient current flow
Smooth surface & burr-free edges — ensures safe insulation application
Excellent formability — suitable for bending, coiling, and wrapping
Lightweight & cost-effective alternative to copper
Corrosion & oxidation resistance — longer lifespan in humid environments
Custom production — various alloys, widths, thicknesses, and tempers available
ISO 9001 & SGS certified quality control
Export-grade coil packing: moisture-proof film + kraft paper + steel strapping + wooden pallets
100% Inspection on thickness, conductivity, surface finish, burr level
Mill Test Certificates (MTC) provided per batch
Compliance with ASTM B209 / GB/T 3190 / ISO 9001 standards
A: It provides similar performance with 30–50% lower material cost and ~67% less weight, reducing overall transformer weight and installation cost.
A: Yes. Properly insulated strips (e.g., NOMEX-wrapped) are suitable for both dry-type and oil-immersed designs.
A: Kraft paper, NOMEX, Mylar, or fiberglass cloth depending on temperature, voltage, and application.
A: While aluminum has lower conductivity, its lower density and cost make it highly efficient for most transformer types.
