Copper Strip
Premium copper strip for electrical applications with high conductivity.
View Details →Copper Strip
Copper Strip
Grades: T2, T3, C11000, C10200 | Temper: Y, Y2, M
Haomei Copper Strip is produced from high-purity copper cathodes through advanced rolling and annealing processes. Our copper strip features excellent electrical conductivity, superior formability, and consistent quality for demanding electrical applications including transformers, busbars, and connectors.
📋 Technical Specifications
| Grade | T2, T3, C11000, C10200, C10100 |
| Temper | Y (Hard), Y2 (Half Hard), M (Soft) |
| Thickness | 0.3mm – 0.8mm |
| Width | 10mm – 20mm |
| Coil Weight | 200kg – 2000kg |
| Electrical Conductivity | ≥ 98% IACS (C10100) |
| Surface | Bright finish, natural, or coated |
| Standard | ASTM B152, EN 1172, GB/T 2059 |
| Packing | Wooden case, moisture-proof, steel straps |
Application Scenarios
Our copper strip is used across various electrical and industrial applications:
Transformer Windings
High-conductivity copper strip for transformer primary and secondary windings.
Busbars & Connectors
Copper strip for electrical busbars, terminals, and connectors in switchgear.
Battery Components
Copper strip for battery terminals and interconnects in energy storage systems.
Electronics
Thin copper strip for printed circuit boards and electronic components.
Building Construction
Copper strip for roofing, cladding, and architectural applications.
Automotive
Copper strip for automotive electrical systems and EV components.
Key Features
High Conductivity
Electrical conductivity ≥ 98% IACS for optimal electrical performance.
Bright Surface
Clean, bright surface finish suitable for visible applications.
Precise Tolerance
Thickness tolerance within ±0.01mm for consistent quality.
Excellent Formability
Easy to bend, stamp, and process for various applications.
Corrosion Resistant
Natural corrosion resistance with optional protective coating.
Full Certification
Mill test certificates and third-party inspection available.
Customer Case Studies
🇩🇪 Case Study: German Electrical Equipment Manufacturer
A leading German electrical equipment manufacturer selected Haomei C11000 copper strip for their high-voltage busbar production. The excellent conductivity and precise dimensions reduced their assembly time significantly.
25%
Faster assembly
99.9%
Quality acceptance rate
200 tons
Annual order
FAQ
Here are 5 frequently asked questions (FAQs) about Copper Strip for Transformers, focusing on the technical and commercial concerns of buyers
What are the key differences between Copper Strips and Aluminum Strips for transformers?
Conductivity: Copper (100% IACS) is significantly more conductive than Aluminum (~61% IACS).
Resistivity: Copper’s low resistivity (0.01724 Ω·mm²/m) vs. Aluminum’s (0.0282 Ω·mm²/m) allows for a 30-40% reduction in winding volume.
Mechanical Strength: Copper has a higher Tensile Strength, making it more resistant to the physical stresses of power surges compared to the softer aluminum.
What is the typical "Temper" or hardness required for transformer copper?
Transformer strips are almost exclusively supplied in the Soft (O) Temper. This state is defined by a low Tensile Strength (typically 200–250 MPa) and a high Elongation at break (usually ≥35% to 40%). This allows the material to be wound into tight radii without cracking or "spring-back," ensuring the windings remain compact and vibration-free.
Why is the "Burr-Free" requirement so critical for copper strips?
Even a microscopic burr can cause a dielectric breakdown. Quality standards typically dictate that burr height must not exceed 0.01mm to 0.03mm (depending on strip thickness). By utilizing rounded or chamfered edges, manufacturers ensure the strip does not compromise the insulation's dielectric strength, which is vital for the transformer's 20-30 year lifespan.
What are the standard copper grades used for transformer strips?
The standard is C11000 (ETP), which must meet a minimum conductivity of 100% IACS (International Annealed Copper Standard). For applications requiring high-temperature brazing, C10200 (Oxygen-Free) is used. Both grades typically maintain a high purity level of 99.9% Cu, ensuring consistent electrical performance and low thermal expansion.
Why is Copper Strip preferred over Copper Wire for transformer windings?
Copper strips provide a superior space factor, utilizing up to 95% of available winding space compared to roughly 70-80% for round wire. This density, combined with a resistivity of approximately 0.01724 Ω·mm²/m (at 20°C), minimizes losses. The flat surface area also improves heat dissipation and mechanical rigidity against electromagnetic forces during short circuits.
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