Cupper cathodes

High-purity refined copper for global industry
Copper cathodes are the final, high-purity form of copper produced during the electro-refining or electro-winning process. They represent one of the most important non-ferrous industrial materials in the world and serve as the foundation for nearly all copper-based products.
​
What Are Copper Cathodes?
​
Copper cathodes are flat rectangular sheets of 99.97% to 99.99% pure copper, meeting LME Grade A specifications. Their exceptional purity makes them suitable for electrical applications, advanced manufacturing, and further processing into wire, bars, rods, tubes, sheets, and alloys.
Production Process
Copper cathodes are produced through two main methods:
-
Electro-refining (ER):
Blister copper is dissolved in an electrolyte and electrically deposited onto stainless steel plates. This process removes impurities such as sulfur, iron, and precious metals. -
Electro-winning (EW):
Copper is extracted directly from oxide ores through a hydrometallurgical process, producing extremely clean, high-purity copper suitable for electrical applications.
Both methods produce cathodes that satisfy international standards such as LME Grade A, ASTM B115, and GOST 859-2001.

Key Features
-
Purity: 99.97% – 99.99% Cu
-
Appearance: Smooth, shiny plates, usually bundled for packaging
-
Dimensions (Typical): Approximately 910 × 910 mm or similar specifications, depending on the producer
-
Single Plate Weight: 100–125 kg (varies by origin)
-
Packaging: Bundles of about 1–2 tons, strapped with steel bands, suitable for container or bulk shipment
Applications
Thanks to its high conductivity and high purity, copper cathodes are widely used in:
-
Cables and power transmission
-
Transformers, motors, and generators
-
Copper rod and wire production
-
Industrial machinery and components
-
Renewable energy systems
-
High-tech manufacturing and electronics industry
-
Automotive and battery sectors
Global Trade and Standards
Copper cathodes are traded worldwide under strict standards.
Major producing countries include: Chile, Peru, Democratic Republic of Congo, Zambia, Kazakhstan, Russia, China, and Poland.
Cathodes registered under LME brands guarantee consistency, traceability, and quality, recognized by international buyers and financial institutions.
Importance of Copper Cathodes
In today’s global economy driven by electrification, clean energy, and digital technology, high-purity copper is a strategic resource.
From households to high-voltage grids, and to electric vehicles, copper cathodes form the backbone of modern infrastructure and global development.
Differences Between Branded and Non-Branded Copper Cathodes
A. Branded Copper Cathodes
-
Produced by internationally recognized smelters and refineries, officially registered with the London Metal Exchange (LME).
-
Meet strict LME quality requirements (Grade A, minimum 99.99% Cu).
-
Offer stable production standards, reliable supply, and full traceability.
-
Due to guaranteed quality and global market recognition, branded cathodes are usually priced higher and are easier to finance, trade, and deliver internationally.
B. Non-Branded Copper Cathodes
-
Produced by refineries not registered with the LME.
-
While they can still achieve acceptable purity levels (typically 99.97–99.99% Cu), they lack LME certification.
-
Prices are generally lower than LME-branded cathodes.
-
Common in emerging markets, buyers often require additional inspection, due diligence, and sometimes performance bonds to mitigate risks.
C. Price Differences
-
Branded cathode prices are directly linked to the official LME Grade A copper price.
-
Non-branded cathodes are usually sold at “LME price minus discount” (e.g., –12%, –16%, or even –20%), depending on origin, refinery reputation, and market conditions.
Summary
Branded cathodes provide guaranteed quality and global recognition, while non-branded cathodes are more competitively priced but carry higher risks, requiring stricter verification procedures.
Would you like me to also prepare this in a side-by-side bilingual format (Chinese–English) so it can serve as a professional reference for international partners?
Copper Cathodes – LME Grade A Specification
​
Copper Cathodes (Grade A) must comply with the requirements of the London Metal Exchange (LME) and ASTM B115. This guarantees global acceptance, consistent purity, and suitability for all industrial applications, including wire & cable, tubes, busbars, and high-conductivity components.
​
1. Chemical Composition (LME Grade A / ASTM B115)
​
Minimum Copper (Cu):
-
99.9935% (delivered LME good-delivery brands)
-
99.97% (minimum acceptance level)​
Maximum allowable impurities (ppm):​
​
Element Max (ppm)
Ag (Silver) 25
As (Arsenic) 5
Bi (Bismuth) 1
Cd (Cadmium) 1
Co (Cobalt) 1
Fe (Iron) 10
Mn (Manganese) 1
Ni (Nickel) 5
e (Tellurium) 2
​
​2. Physical Characteristics
​
-
Shape: Flat rectangular plates
-
Surface: Smooth, clean, free of oil, dust, rust, dirt, stones, grease, paint, or foreign materials
-
Tolerances: In accordance with ASTM B115 and LME regulations
-
Conductivity: Typically 100% IACS (International Annealed Copper Standard)
3. Dimensions & Weight
​
Standard export packing varies by producer, but typically:
​
-
Plate thickness: 8–12 mm
-
Plate size: Approx. 900 × 900 mm
-
Individual cathode weight: Approx. 80–125 kg
-
Bundle weight: 1,000–2,500 kg, strapped with steel bands
-
20' FCL loading: Approx. 20–22 MT
-
40' FCL loading: Approx. 24–26 MT
​
4. Packaging
​
-
Bundles strapped with steel bands
-
Bundles are placed on wooden or steel pallets for easier loading/unloading
-
Each cathode is marked with the producer’s brand, batch number, and weight
​
5. Inspection & Certification
​
-
Inspection: SGS / Bureau Veritas at loading port (or buyer’s nominated inspector)
-
Certificates:
-
Chemical composition analysis
-
Weight list
-
Packing list
-
Certificate of origin
-
LME registered brand certificate (when applicable)​
-
LME Grade A Copper Cathodes are high-purity copper plates (min. 99.97% Cu) produced in accordance with LME and ASTM B115 standards. They are the world’s benchmark quality for industrial processing and are used for manufacturing electrical conductors, wire & cable, tubes, sheets, and all applications requiring high conductivity and consistent metallurgical purity. Cuprumex supplies LME-branded and non-branded cathodes from global producers with full export documentation and SGS inspection.
Ni (Nickel) 5
P (Phosphorus) 2
Pb (Lead) 5
S (Sulphur) 15
Sb (Antimony) 4
Se (Selenium) 5
Sn (Tin) 2
Zn (Zinc) 5
O (Oxygen) 400
