C11000 Bare Copper Rod 99.9% Pure, Annealed for Superior Ductility Diameter 4 -

Product Specification

C11000 Bare Copper Rod 99.9% Pure, Annealed for Superior Ductility Diameter 4 - 300mm

Specification of our copper products

C11000 Bare Copper Rod 99.9% Pure, Annealed for Superior Ductility – Diameter 4 – 300mm

Product Overview

C11000 bare copper rod, also known as Electrolytic Tough Pitch (ETP) copper or Cu-ETP, is one of the most widely used high-conductivity copper alloys in industrial and electrical applications. With a minimum purity of 99.9% copper and carefully controlled oxygen content (typically 200–400 ppm), C11000 offers an exceptional balance of electrical conductivity, thermal performance, mechanical workability, and corrosion resistance. This product is supplied in an annealed condition to maximize ductility—making it ideal for bending, drawing, stamping, and other forming operations without cracking or failure.

Manufactured to meet international standards such as ASTM B187, UNS C11000, EN 13601 (Cu-ETP), and ISO 1337, our C11000 bare copper rods are available in diameters ranging from 4 mm to 300 mm, catering to diverse engineering needs—from fine electrical components to heavy-duty busbars and grounding systems.

This product information sheet provides a comprehensive overview of the material’s composition, physical and mechanical properties, typical applications, processing guidelines, and ordering specifications.

Chemical Composition

C11000 is defined by its high copper content and minimal impurities. The oxygen present enhances castability and hot workability but must be controlled to avoid hydrogen embrittlement in reducing atmospheres.

Note: Silver may be present as a residual element and does not significantly affect conductivity.

Key Properties

Electrical Conductivity

C11000 exhibits excellent electrical conductivity—typically ≥ 100% IACS (International Annealed Copper Standard) when fully annealed. This makes it the benchmark material for electrical wiring, bus conductors, and transformer windings.

Thermal Conductivity

With a thermal conductivity of approximately 398 W/m·K at 20°C, C11000 efficiently dissipates heat, making it suitable for heat exchangers, motor components, and electronic cooling systems.

Mechanical Properties (Annealed Condition)

The annealing process relieves internal stresses and refines the grain structure, resulting in superior formability:

Values may vary slightly depending on diameter and exact annealing parameters.

Advantages of Annealed C11000 Copper Rod

• Superior Ductility: Enables deep drawing, coiling, and complex bending without fracture.
• High Purity: Ensures consistent electrical and thermal performance.
• Excellent Solderability & Brazability: Readily joins with common techniques.
• Good Corrosion Resistance: Performs well in atmospheric, freshwater, and many chemical environments.
• Recyclable: 100% recyclable without loss of properties—supports sustainability goals.

Common Applications

C11000 annealed copper rods are indispensable across multiple sectors due to their reliability and performance:

• Electrical Engineering: Busbars, switchgear components, transformer leads, grounding rods.
• Electronics: Connectors, terminals, lead frames, and printed circuit board (PCB) through-holes.
• Renewable Energy: Solar inverter bus conductors, wind turbine electrical systems.
• Automotive: EV battery interconnects, charging infrastructure components.
• Industrial Machinery: Bearings, bushings, and wear-resistant parts (when combined with surface treatments).
• Construction: Lightning protection systems, architectural grounding networks.

Processing & Fabrication Guidelines

Machining

While C11000 is not classified as a "free-machining" alloy, it can be machined using sharp tools, low cutting speeds, and adequate lubrication. Chip breakers are recommended to manage long, stringy chips.

Forming

The annealed condition allows extensive cold forming:

• Bending: Minimum bend radius = 1× rod diameter.
• Drawing: Can be drawn to smaller diameters or shaped into complex profiles.
• Stamping/Punching: Suitable for flat stock derived from rod rolling.

Joining

• Soldering: Excellent with rosin-core or acid-core fluxes.
• Brazing: Use phosphorus-containing filler metals (e.g., BCuP alloys) for self-fluxing joints.
• Welding: Generally not recommended due to porosity risk from oxygen; if required, use inert gas shielding (TIG/MIG) with deoxidized copper filler.

Heat Treatment

• Annealing: Typically performed at 400–700°C in a protective atmosphere (to prevent oxidation), followed by rapid or slow cooling depending on desired grain size.
• Stress Relieving: At 250–300°C for 30–60 minutes to reduce residual stresses without significant softening.

Avoid exposure to hydrogen-containing atmospheres above 200°C, as hydrogen can react with oxygen to form steam, causing internal cracks (hydrogen embrittlement).

Dimensional Tolerances & Surface Finish

Our C11000 rods are manufactured to tight dimensional controls and smooth surface finishes suitable for secondary processing:

Custom tolerances and finishes (e.g., polished, peeled, or centerless ground) available upon request.

Rods are typically supplied straight-cut (1–6 meters) or coiled (for diameters ≤ 20 mm), with ends deburred and packaged to prevent surface damage during transit.

Quality Assurance & Certification

Every batch undergoes rigorous quality control, including:

• Spectrometric analysis for chemical composition
• Eddy current testing for electrical conductivity verification
• Tensile and hardness testing per ASTM E8/E18
• Visual and dimensional inspection

Mill Test Reports (MTRs) conforming to EN 10204 3.1 or 3.2 are provided with each shipment. Full traceability from raw material to finished product is maintained.

Ordering Information

To place an order or request a quotation, please specify the following:

Lead times typically range from 2 to 4 weeks, depending on size and quantity.

Environmental & Safety Notes

C11000 copper is non-toxic and poses no significant health hazards under normal handling conditions. However:

• Wear gloves to prevent skin oils from tarnishing the surface.
• Use eye protection when cutting or machining.
• Ensure adequate ventilation when brazing or heating to avoid fume inhalation.

Copper is one of the most recycled metals globally—over 80% of all copper ever mined is still in use today. Choosing C11000 supports circular economy principles.

Why Choose Our C11000 Copper Rod?

• Consistent Quality: Produced in ISO 9001-certified facilities with real-time process monitoring.
• Global Compliance: Meets ASTM, EN, JIS, and GB standards.
• Technical Support: Our metallurgical team assists with material selection and application design.
• Sustainable Sourcing: Raw materials sourced from responsibly managed mines.

Whether you’re designing high-efficiency motors, next-generation power electronics, or robust grounding infrastructure, our annealed C11000 bare copper rod delivers the purity, ductility, and performance your project demands.