Copper Wire Rod 8mm (LME Grade A) - High Conductivity

Overview

Copper Wire Rod 8 mm is a continuously cast and rolled product made from 99.99 % pure copper cathode.
It forms the basis of electrical manufacturing industries—from power transmission and motors to telecommunications.
Known for its high conductivity, mechanical flexibility, and clean surface, copper wire rod is one of the most demanded forms of refined copper for industrial use.

What Is Copper Wire Rod

Copper Wire Rod is produced by melting high-purity cathodes and casting them into 8 mm diameter rods through Continuous Casting and Rolling (CCR) or Upcast processes.
The rods are then drawn into finer wires for cables, busbars, transformers, and electronic components.
Each coil is tested for conductivity (≥ 101 % IACS), surface finish, and dimensional precision to ensure stable downstream performance.

Production Process

Continuous Casting and Rolling (CCR)

1. Copper cathodes are melted at approximately 1200 °C.

2. The molten metal passes through a casting wheel to form a continuous bar.

3. The bar is rolled through several stands to reach the final 8 mm diameter.

4. The rod is cooled and coiled into clean, oxide-free bundles.

This process provides consistent mechanical strength, smooth surface quality, and uniform conductivity.

Upcast Technology

Used primarily for oxygen-free (OFC) production.
Molten copper is drawn vertically upward through graphite dies, producing rods with superior purity and low oxygen content.
Suitable for magnet wire, electronic, and high-frequency applications.

Grades and Standards

Technical Characteristics

Applications

Copper Wire Rod is widely used in:

• Power and control cables

• Transformers and electric motors

• Enamelled magnet wire

• Automotive wiring and EV systems

• Busbars, switchgear, and control panels

• Telecommunication and data cables

Copper’s unique conductivity and ductility make it indispensable in modern electrical infrastructure.

Quality Assurance

Each coil undergoes strict testing:

• Visual inspection for cracks, voids, or oxidation

• Certified chemical composition (COA per batch)

• Conductivity and elongation tests

• Dimensional control within ± 0.4 % tolerance

• Optional third-party inspection (SGS / BV / Intertek)

Compliance standards: ASTM B49, EN 1977, ISO 1634
All coils carry heat number, production date, and batch ID for traceability.

Market and Pricing

Copper Wire Rod follows the London Metal Exchange (LME) copper price plus a manufacturing premium.
Typical export range: USD 8,200 – 9,500 per MT, depending on purity, brand, and logistics.
Market variables include energy costs, LME/SHFE stocks, freight rates, and currency movement.

FAQ — Technical Questions

1. What is the standard diameter?
8 mm is the international standard; 9.5 mm and 12 mm are produced on request.

2. What conductivity should it have?
At least 101 % IACS to ensure low resistance and energy efficiency.

3. Difference between ETP and OFC grades?
ETP contains ~ 0.04 % oxygen for easier drawing; OFC is oxygen-free and used where maximum conductivity is required.

4. How are prices determined?
Based on LME Copper Cash/3M plus processing premium.

5. Container capacity?
20 – 22 MT per 20-ft container.

6. Can wire rod be re-melted for alloys?
Yes, its purity makes it suitable for brass and bronze production.

7. What tests are critical before export?
Conductivity, tensile strength, and surface oxidation tests.