High-end copper foil serves as a foundational material for the electronics and new energy industries, with its performance directly affecting the signal transmission efficiency, energy density, and reliability of downstream products. As technologies like 5G, AI, and electric vehicles advance, the classification standards and technical requirements for copper foil are becoming increasingly refined. This article systematically categorizes high-end copper foil based on manufacturing process, physical properties, surface treatment, and application area, analyzing its technical features and industry trends.
Classification by Manufacturing Process
High-end copper foil is primarily divided into two categories based on production method:
Electrodeposited (ED) Copper Foil: Produced via electrochemical deposition. It dominates the global market (approx. 90% share), offers lower cost and higher tensile strength, but has lower flexibility. Its grain structure is columnar, and standard surface roughness (Rz) is around 7-8 μm, requiring special treatment to reduce signal loss for high-frequency use. Advanced products include:
HVLP Foil: Features ultra-low profile with surface roughness ≤ 2.5 μm, used in 5G base stations and AI servers.
RTF Foil: Utilizes a reverse-treatment process to achieve low roughness, with technology evolving through multiple generations.
Rolled and Annealed (RA) Copper Foil: Manufactured through physical rolling and annealing. It has a fibrous grain structure, superior flexibility (capable of withstanding tens of thousands of bends), and a smooth surface (Rz ≤ 1.1 μm). Its purity is typically ≥99.9%, with slightly better conductivity than ED foil. Advanced variants include high-temperature anti-oxidation foil and surface-treated foils (e.g., blackened/reddened) for enhanced electromagnetic shielding.
Classification by Thickness & Physical Properties
This classification focuses on specialized performance needs:
Ultra-Thin/Peelable Foil: Thickness range of 3-12 μm. Critical for IC substrate and 2.5D/3D advanced packaging, addressing challenges in strength and reliable peeling at extreme thinness.
Heavy/Thick Copper Foil: Thickness ≥ 70 μm (≥ 2 oz/ft²). Designed for high-power applications like EV powertrains and energy storage modules, requiring high current-carrying capacity, thermal conductivity, and peel strength.
Low-Profile/Low-Loss Copper Foil: Engineered for high-frequency and high-speed circuits. Key parameters include surface roughness ≤ 2.5 μm and dielectric loss (Df) ≤ 0.002. Demand is driven by 6G communications and high-speed data centers, with AI servers consuming significantly more than traditional ones.
Classification by Surface Treatment & Function
Surface modifications enable specific functionalities:
Double-Sided Smooth Foil: Both sides have very low roughness (≤ 1.3 μm). Used in high-density interconnect (HDI) boards for smartphones and wearable devices.
Composite Copper Foil: Represents a disruptive innovation, including:
Copper-Aluminum Composite: Combines copper's conductivity with aluminum's light weight, reducing cost for consumer electronics batteries.
PET-Based Composite Foil: Features a metal-PET-metal "sandwich" structure, cutting copper use by ~70% while improving safety and energy density for lithium-ion batteries. This market is expected to grow substantially.
Classification by Primary Application Field
PCB Applications: The global market for high-end PCB foil is steadily growing. The technology roadmap points towards ever-lower roughness (e.g., ≤ 0.3 μm for latest-generation HVLP) and thinner foils (< 3 μm), driving upgrades in electrolytes and production equipment.
Lithium-Ion Battery Applications: Categorized by thickness into ultra-thin (≤ 6 μm), thin (6-12 μm), and standard (12-18 μm). The trend is towards thinner foils to increase battery energy density, with commercial production already at 4.5 μm thickness.
Environmental & Industry Trends
The industry is shaped by two major forces:
Green Manufacturing: Environmental regulations are pushing the adoption of lead-free processes, chromium-free passivation, and advanced wastewater recycling and treatment systems.
Domestic Supply Chain Development: Local production of high-end copper foils is accelerating. The market share for domestically produced advanced PCB foil is projected to increase significantly, with companies mastering core technologies and achieving scale expected to lead future growth.
The classification system for high-end copper foil reflects the industry's relentless pursuit of material performance. From the refined surface treatment of ED foil to the high flexibility of RA foil, and from breakthroughs in ultra-thin foils to disruptive composite structures, the field is rapidly evolving towards thinner, lower-loss, and higher-reliability materials. Accelerated domestic production capabilities and stricter environmental standards will be key drivers, pushing the industry towards higher quality development.
Our product range
| Product Category | Product Name | Common Standard Grades | Key Specifications (Typical) | |
|---|---|---|---|---|
| Copper Tubes / Pipes | • Straight & Coiled Tubes • Refrigeration Tubes • Capillary Tubes • Heat Exchanger Tubes |
C11000 (ETP Copper) C12200 (DHP Phosphorous Copper) C12000 (DLP Phosphorous Copper) EN 12735-1: CU-DHP JIS H3300: C1220, C1100 |
Standards: ASTM B75, B88, B280, EN 12735 OD: 3mm - 300mm Wall Thickness: 0.3mm - 10mm Condition: Annealed (O), Hard (H) |
|
| Copper Sheets / Plates | • Hot Rolled Plates • Cold Rolled Sheets • Cut-to-Size Blanks |
C11000 (ETP Copper) C10200 (Oxygen-Free Copper) C26000 (Cartridge Brass) C70600 (90-10 CuNi) |
Standards: ASTM B152, B465 Thickness: 0.5mm - 50mm (Plates: >3mm) Width: up to 1500mm Length: up to 4000mm or custom Condition: Rolled, annealed, mill finish |
|
| Copper Rods / Bars | • Round, Square, Hexagonal Rods • Copper Alloy Rods • Precision Ground Bars |
C11000 (ETP Copper) C36000 (Free-Cutting Brass) C26000 (Cartridge Brass) C10200 (Oxygen-Free Copper) C17200 (Beryllium Copper) |
Standards: ASTM B187, B301, EN 12163, 12164 Diameter: 2mm - 200mm Length: Straight bars up to 6m, coils available Condition: Drawn, extruded, annealed |
|
| Copper Wires | • Bare Copper Wire (Hard/Soft) • Enamelled (Magnet) Wire • Stranded & Bunched Wires • Braided Wires & Flexibles |
C11000 (ETP Copper) C10200 (Oxygen-Free Copper) C10100 (C-OF Copper) Grade: 1/2 Hard, 1/4 Hard, Soft |
Standards: ASTM B1, B2, B3, IEC 60228 Diameter: 0.05mm - 12mm (bare) Conductivity: 100% IACS min. Packaging: Spools, coils, drums |
|
| Copper Foils | • Rolled Strips (in Coils) • Thin Foils • Connector Alloy Strips |
C11000 (ETP Copper) C26000 (Cartridge Brass) C19210 (Phosphor Bronze, 1.0%) C26800 (Yellow Brass) |
Standards: ASTM B152, B465, EN 1652 Thickness: 0.05mm - 3.0mm (Strips), <0.05mm (Foil) Width: 10mm - 600mm (typical coil width) Condition: Hard (H), 1/2 Hard, Soft (O), rolled temper |
Our factory
We are a specialized manufacturing factory with integrated production capabilities for copper and copper alloy products, including tubes, rods, bars, plates, sheets, strips, and wires. Our facility is equipped with modern production lines featuring extrusion presses, continuous casting machines, precision rolling mills, drawing benches, and controlled annealing furnaces, enabling us to control the entire process from raw material to finished product. Supported by an in-house laboratory for quality assurance and compliant with international standards (ASTM, EN, JIS), we provide customized solutions, reliable packaging, and efficient export logistics to serve global clients in HVAC&R, electrical, automotive, and industrial sectors.
copper product packaging
We take great care in packaging to ensure our copper products arrive in perfect condition. Standard packaging includes moisture-resistant materials, sturdy wooden crates or pallets, and protective corner guards to prevent damage during transit. For products requiring enhanced protection against oxidation, such as high-purity copper tubes or finely finished surfaces, we also offer optional nitrogen-purged (inert gas) packaging upon request. This service effectively minimizes surface oxidation during long-distance shipping or storage, ensuring your products maintain their optimal quality upon arrival.
