ETP and OF Copper Rods for Electric Vehicles

HIGH-RELIABILITY MATERIAL

Superior Conductivity Solutions for Next-Generation EV Performance

ETP (Electrolytic Tough Pitch) and OF (Oxygen-Free) copper rods deliver the electrical backbone that every high-performance electric vehicle demands. With an electrical conductivity of up to 59.6 MS/m—significantly higher than aluminum—these copper rods enable efficient transmission of power across EV motors, battery interconnects, and charging systems with minimal energy loss. For EV manufacturers pushing the boundaries of range, power density, and reliability, the right copper rod isn’t just a component—it’s a competitive advantage.

At IMC, we engineer ETP and OF copper rods specifically for the electric vehicle industry, ensuring every rod meets the exacting standards that modern EV powertrains require.

WHY ENGINEERS CHOOSE OF / OFHC COPPER ROD

Why EV Manufacturers Choose Our ETP and OF Copper Rods

Maximum Conductivity

Our rods are produced from 99.9%+ pure copper, including C11000 (ETP) and C10200 (OFHC) grades, with oxygen content carefully controlled. The high purity of these copper rods reduces electrical resistance in EV applications, directly lowering I²R losses and improving motor efficiency across every driving cycle.

Temperature Resistance

EV power electronics and motor windings face junction temperatures up to 175 °C and thermal swings exceeding 125 °C. Our ETP and OF copper rods maintain performance through tens of thousands of thermal cycles, preventing thermal throttling in critical EV components.

Corrosion Protection

Both ETP and OF copper rods offer excellent resistance to corrosion and mechanical wear. This durability reduces degradation over time, lowering maintenance costs and extending the service life of battery packs and connectors.

Precision Manufacturing

Tight dimensional tolerances (±0.3% or better) across diameters from 5 mm to 35 mm ensure our rods meet strict automotive industry standards. Every rod ships with a bright, smooth finish free of pits, inclusions, or surface defects.

Sustainable Solution

Copper is approximately 95% recyclable, and our manufacturing process supports sustainable development goals. Using highly recyclable metals reduces the total environmental footprint of every vehicle produced.

WHAT SETS OUR ROD APART

What Makes IMC ETP and OF Copper Rods Different

Most copper suppliers focus on generic rod products built for general industrial use. They aren’t engineered for the unique thermal, mechanical, and conductivity demands of electric vehicles.

IMC is built differently:

EV-Specific Alloy Formulation – Beyond standard OFHC and ETP grades, we offer advanced Cu-Cr-Zr alloy formulations (e.g., Cr ~0.45%, Zr ~0.18%) that suppress grain growth and raise recrystallization temperatures. These alloys resist softening under sustained heating and high current loads common in EV motor windings, wiring harnesses, and battery connections.
Advanced Forming Capabilities – We produce rods in round, square, and flat cross-sections to optimize slot fill factor in motors and maximize packing density in battery interconnects. Copper rods have replaced traditional round copper wires in many EV motor stators, and our custom geometries increase the slot fill factor from a typical 45% to 70–80%.
Quality Certification – IMC maintains ISO/TS 16949 automotive quality management certification, ASTM B49 compliance for electrical copper rod, and UL/IEC standards—authority signals that many competitors simply cannot match.

OUR PRODUCTS

High-Quality Copper Products Built to Specification

We supply a full range of copper products and specialty metals designed to meet the demands of modern industrial and manufacturing applications. From standard stock materials to fully custom specifications, every product is produced with consistency, performance, and reliability in mind. Whether you’re sourcing for precision components or large-scale production, IMC delivers materials you can trust to meet your exact requirements.

Motor Integration

ETP and OF copper rods form the core windings in electric motors, where copper's low resistance improves torque delivery and creates a stronger magnetic field. Higher copper fill in motors leads to increased power density, enabling smaller and lighter EV motors without compromising output. Using high-purity copper reduces energy loss as heat, contributing directly to extended driving range.

Battery Connection

Copper rods are processed into busbars that connect battery cells and modules, ensuring consistent energy flow with minimal voltage drop. A typical EV contains three to four times more copper than ICE vehicles, and reliable busbar connections play a pivotal role in overall pack performance, durability, and safety under vibration.

Performance Results

The measurable impact is clear: copper's high thermal performance supports effective heat management, copper components lower electrical resistance resulting in enhanced efficiency, and copper's high power density contributes to optimized EV performance. Research on EV power modules with Cu clip bonding shows thermal resistance increases of only ~20% after 70,000 power cycles at Tjmax of 175 °C—demonstrating the long-term reliability manufacturers require.

SUPPLY & DOCUMENTATION

Technical Specifications

Material

C10200 (OFHC), C11000 (ETP), C10100 (OFE); copper content ≥ 99.95% for OFHC grades

Purity

Oxygen content < 5 ppm (OFHC); total impurities < 0.05%

Electrical Conductivity

≥ 100% IACS; resistivity at 20 °C ≤ 1.72 µΩ·cm

Tensile Strength

200–270 MPa

Elongation

≥ 30%, typically 35–45% for excellent formability

Available Diameters

5 mm to 35 mm (per ASTM B49); custom sizes available

Cross Sections

Round, square, flat/rectangular

Surface Finish

8mm to 25mm

Certifications

Bright, smooth, free of pits and flaking

Packaging

Coils or straight-length bundles; custom packaging for high-volume automotive delivery

Testing Protocols

Conductivity verification, tensile/elongation testing, power cycling validation, embrittlement testing for oxygen-free grades

HOW IT'S MADE

Industries We Serve

Our ETP and OF copper rods support the full spectrum of the electric vehicle industry:

Electric vehicle motor manufacturers

High-purity copper cathode is produced through electrolysis, then melted under controlled conditions to maintain chemistry, oxygen level, and cleanliness — a maximum of 0.02% phosphorus contributes to excellent workability.

Battery pack assemblers

Molten copper is continuously cast and processed through a rolling mill to produce rod with controlled diameter, sound internal structure, and stable surface condition — ready for drawing, bending, drilling, riveting, and forming.

EV charging infrastructure companies

Before shipping, rod is verified for electrical conductivity, chemical composition, dimensional accuracy, and surface finish, confirming the minimum 100% IACS requirement and reducing downstream risk.

Power electronics manufacturers

The transition to electrification will continue to grow copper demand across all these segments. EVs will require an additional 978,000 tonnes of copper by 2040, and the wiring loom alone will account for over 50% of that demand. IMC is positioned to meet this future head-on.

FAQ

Frequently Asked Questions

Can you meet automotive production volumes?

Yes. IMC has the manufacturing capacity and scale to supply multi-ton orders of ETP and OF copper rods with consistent quality. Our ISO/TS 16949 certification ensures our quality management system aligns with automotive industry requirements for traceability, process control, and continuous improvement.

How do your ETP and OF copper rods improve EV motor efficiency?

Copper wire improves motor efficiency and reduces energy loss by minimizing I²R losses. Our OFHC and ETP rods, with conductivity ≥ 100% IACS, ensure that more electricity reaches the motor as useful torque rather than being lost as heating. Copper rods also increase slot fill factor to 70–80%, boosting power density and enabling more compact motor designs. Future EVs may contain as much as 72 kg of copper, and the purity of that copper directly impacts overall vehicle efficiency.

What certifications do you maintain for automotive applications?

IMC maintains ASTM B49 compliance, ISO/TS 16949 automotive quality certification, UL and IEC electrical safety standards, and full UNS designation traceability for C10200, C11000, and C10100 grades.

Do you offer custom specifications for specific EV applications?

Absolutely. We specialize in custom diameters, cross-sectional shapes, and alloy formulations—including Cu-Cr-Zr variants engineered for anti-softening performance in wiring harnesses and high-temperature applications. Our engineering team works directly with OEMs to create specifications that match exact motor, battery, or connector designs. Additionally, copper wire manufacturing involves drawing, annealing, twisting, and stranding, and we support the full process from rod to finished wire form.

How does copper compare to aluminum in EV applications?

Copper offers roughly double the conductivity of aluminum per unit volume, along with superior thermal stability and fatigue resistance. While aluminum provides weight savings, copper's excellent conductivity and reliability make it ideal for high-performance motors, battery interconnects, and sensors where energy efficiency is non-negotiable. The choice often depends on balancing performance, cooling requirements, and cost for each specific application.

Contact Us

Need a Reliable Copper Supplier? Let’s Talk.

Whether you need a quote, have technical specifications to review, or are looking for a more dependable supply partner, our team is ready to help. IMC works with engineers, manufacturers, and procurement teams to deliver high-quality copper products and specialty metals with the reliability your operation depends on.