High-Purity Copper

Only silver surpasses copper in intrinsic electrical conductivity — yet copper's abundance, processability, and cost structure have made it the undisputed backbone of modern electrical and electronic infrastructure. From the kilometer-long wiring harnesses in aircraft to the nanoscale damascene interconnects within microprocessor chips containing over 100 kilometers of copper wiring, this reddish-orange metal conducts not just electrons but the very flow of technological progress. Eata Energy supplies a comprehensive range of high-purity copper products engineered for applications where conductivity, thermal transfer, and material consistency cannot be compromised.

Our catalog spans grades from 4N (99.99%) through 6N (99.9999%) and beyond, encompassing standard OFC (Oxygen-Free Copper), OFHC (Oxygen-Free High Conductivity) C10100/C10200, and ultra-high-purity variants for quantum device research. Available in foil, wire, rod, powder, sputtering targets, and custom-configured forms, each product ships with full traceability documentation and analytical certification.

Fundamental Properties of Copper Metal

Copper's position in Group 11 of the periodic table endows it with a half-filled 4s electron shell and a filled 3d subshell — an electronic configuration that explains its extraordinary conductivity and characteristic reddish color. The table below details the key physical properties that define copper's utility across research and industrial domains.

Figure 1: High-conductivity copper wire on industrial reels ready for electrical and research applications

Two stable isotopes dominate natural copper: ³Cu (69.17%) and ³Cu (30.83%). The 63Cu isotope's nuclear spin of 3/2 interacts with magnetic fields in ways exploited by NMR spectroscopists and condensed-matter physicists studying copper-based superconductors. For electronic and thermal applications, isotopic composition has negligible effect, but specialized research may specify isotopically enriched or depleted material.

Available Forms & Specifications

Eata Energy maintains inventory across the complete range of copper product geometries, each suited to distinct processing methodologies from thin-film deposition through heavy electrical conductor fabrication.

Copper Foil

Our copper foils serve as substrates for lithium-ion battery current collectors, flexible printed circuit laminates, and experimental platforms for 2D materials research. Rolled to tight thickness tolerances with controlled surface roughness for optimal coating adhesion.

• Thickness: 0.006 mm to 2 mm, tighter tolerances available on request
• Width: up to 600 mm depending on gauge
• Temper: annealed (soft), half-hard, full-hard
• Surface finishes: matte, shiny, double-shiny, micro-roughened for adhesion
• Grades: C11000 (ETP), C10200 (OF), C10100 (OFHC), 4N–6N research grades

Copper Wire

Bare and insulated copper wire configurations support electromagnetic coil winding, electrical testing, and experimental setups requiring known-conductivity conductors.

• Diameter: 0.025 mm (magnet wire) to 10 mm (bushing wire)
• Insulation options: bare, polyurethane, polyimide, PTFE, formvar
• Conductivity: 100–101% IACS for OFHC grades
• Applications: coil winding, test leads, superconducting magnet stabilizer, cryogenic wiring

Figure 2: Stack of mirror-finish high-purity copper foil sheets fanned for inspection

Copper Sputtering Targets

Full-density sputtering targets enable PVD deposition of copper seed layers, interconnects, and reflective coatings. Hot-isostatic pressing achieves >99.5% theoretical density with fine, uniform grain structure for consistent sputter profiles and extended target life.

• Purity: 99.99% (4N) to 99.9999% (6N)
• Dimensions: up to 400 mm diameter, custom planar or rotatable configurations
• Grain size: <50 μm for uniform erosion characteristics
• Bonding: indium or elastomer bonded to copper or molybdenum backing plates

Copper Rod, Ingot & Powder

Solid forms provide feedstock for in-house machining, alloy development, and powder metallurgy processes. Electrolytic refining ensures low oxygen and controlled trace element profiles.

• Rod: 3 mm to 100 mm diameter, as-drawn or annealed
• Ingot: electrolytic cathodes, cast bars up to 50 kg
• Powder: spherical (atomized) or irregular (electrolytic), 10 μm to 500 μm

Key Application Areas

Semiconductor Interconnects & Advanced Packaging

Since IBM introduced copper damascene interconnects in 1997, copper has displaced aluminum as the conductor of choice for on-chip wiring. A modern microprocessor may contain tens of interconnect layers with a total copper wire length approaching 100 kilometers. The shift to copper reduced wiring resistance by approximately 40% compared with aluminum, enabling higher clock speeds and lower power consumption. Eata Energy's 5N and 6N copper targets and evaporation materials support research into sub-3 nm node interconnects, where impurity control at the ppb level directly influences electromigration resistance and yield.

Figure 3: Close-up of copper damascene interconnect pattern on a semiconductor device wafer

Superconducting & Quantum Devices

At cryogenic temperatures, 6N copper (99.9999%) exhibits ultra-low electrical loss and exceptionally high thermal conductivity — properties critical for superconducting microwave cavities, quantum computing interconnects, and single-photon detector housings. Goodfellow and other research suppliers have documented that impurity-related scattering in standard electronic-grade copper introduces resistive losses and thermal instability that can compromise device performance at millikelvin temperatures. Our 6N copper foils and machined components address these challenges by virtually eliminating impurity-induced defects.

Thermal Management & Heat Dissipation

With thermal conductivity of 401 W/m·K, copper ranks second only to silver among pure metals. This property makes it indispensable for heat sinks, cold plates, heat spreaders, and vapor chamber cores in power electronics, LED lighting systems, and high-performance computing. OFHC copper (C10100) maintains conductivity values of 100% IACS even after brazing and thermal cycling, ensuring reliable heat transfer in mission-critical cooling systems.

Battery Current Collectors & Energy Storage

Thin copper foil (typically 8–12 μm) serves as the anode current collector in lithium-ion batteries, providing electron transport pathways while minimizing cell weight. As battery manufacturers push toward higher energy densities, research into ultrathin copper foils (sub-6 μm) and composite current collectors with polymer cores has intensified. Our rolled copper foils with controlled surface roughness optimize electrode coating adhesion and electrical contact resistance.

Figure 4: High-purity copper sputtering target mounted in a PVD coating chamber

Alloy Development & Materials Research

Copper forms the basis of numerous high-performance alloy systems: Cu-Be for non-sparking tools and springs, Cu-Ni for marine and coinage applications, Cu-Cr-Zr for resistance welding electrodes, and Cu-Ag for high-strength conductors. Our high-purity copper starting materials enable researchers to investigate alloy systems with controlled additions, studying precipitation hardening, solid-solution strengthening, and their effects on conductivity retention.

Purity Grades & Designations

Copper purity nomenclature varies by industry. The matrix below correlates common designations with composition and typical use cases.

Analytical Verification & Documentation

Every copper batch undergoes multi-technique analysis to verify composition, microstructure, and physical properties before release.

• GDMS (Glow Discharge Mass Spectrometry): bulk trace element analysis at ppb levels for 5N+ grades
• ICP-MS: quantitative impurity profiling for production lots
• XRF: rapid non-destructive composition screening
• Conductivity measurement: four-point probe or eddy current, reported as % IACS
• Oxygen analysis: inert gas fusion for OFC/OFHC grade verification
• Metallography: grain size and inclusion rating per ASTM E112

Figure 5: Copper powder in a glass beaker alongside small copper ingots and braided wire

Tailored Specifications & Custom Solutions

Eata Energy recognizes that standard catalog offerings may not address the specialized requirements of frontier research and advanced process development. Our engineering capabilities extend to custom copper products designed in collaboration with your technical team.

• Custom alloy casting: Cu-Ag, Cu-Cr, Cu-Ni-Sn, Cu-Nb and other research alloy compositions
• Specialized geometries: machined heat spreaders, shaped charges, tapered targets, slotted anodes
• Ultra-high purity: 6N+ grades with dedicated refining runs and enhanced characterization
• Surface engineering: micro-roughened foil, oxide-coated powder, composite cladding
• Order flexibility: research quantities from 50 g through production-scale lots

Consult our materials scientists during project planning to ensure optimal copper grade and form selection for your specific conductivity, thermal, or structural requirements.

For Research or Industrial Raw Materials, Not For Personal Medical Use!