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Modern industrial ecosystems are undergoing a massive transition driven by the twin engines of high-speed electrification and advanced computing architectures. Within this shifting paradigm, the standard pure copper rod is no longer just a basic structural metal. Instead, it is highly engineered to meet ultra-critical thresholds of electrical conductivity, thermal performance, and mechanical machinability.
The rapid proliferation of electric vehicle (EV) charging architectures, high-voltage battery cells, and high-frequency inverters has increased the demand for C10100 and C11000 pure copper rods. Manufacturers rely on these high-conductivity grades to ensure low resistive losses under intense electrical loads.
As 5G networks, aerospace communications, and precision computing systems become more complex, signals must travel over materials free from oxygen and hydrogen embrittlement. Vacuum-induction-melted Oxygen-Free Copper (OFC) has emerged as the premier choice to preserve clean, uncorrupted signals.
While pure copper is soft and challenging to machine, industrial manufacturers now require materials that combine electrical conductivity with excellent mechanical machinability. Alloys doped with Trace Tellurium (C14500) and Sulfur (C14700) address this, optimizing precision fabrication processes.
Understanding the differences in mechanical strength, conductivity, and machinability is essential to selecting the ideal copper grade for your application.
| UNS Grade Designation | Material Category | Electrical Conductivity (% IACS) | Tensile Strength (MPa) | Machinability Index (Free Brass = 100) | Key Industrial Applications |
|---|---|---|---|---|---|
| C10100 (OFE) | Oxygen-Free Electronic Copper | ≥ 101% | 220 - 380 | 20 | Superconductors, High-Vacuum Electronics, Aerospace Busbars |
| C11000 (ETP) | Electrolytic Tough Pitch Copper | ≥ 100% | 220 - 380 | 20 | Electrical Switches, Winding Wires, Stamped Components |
| C14500 | Tellurium Copper | 90% - 96% | 250 - 390 | 85 | Plasma Cutting Electrodes, Electrical Connectors, Switchgear |
| C14700 | Sulfur Copper | 90% - 95% | 240 - 380 | 85 | High-Speed Screw Machine Products, Semiconductor Assemblies |
| C17200 | Beryllium Copper (High Strength) | 22% - 28% | 680 - 1400 | 20 | Heavy-Duty Springs, Non-Sparking Tools, Aerospace Bushings |
| C36000 | Free-Cutting Lead Brass | 26% | 340 - 470 | 100 | Precision Turnings, High-Speed CNC Parts, Plumbing Hardware |
Established in May 2017, Sichuan Kepai New Materials Co., Ltd. is a high-tech private company specializing in the research, development, production, and sales of high-conductivity, high-strength free-cutting tellurium copper and other special copper alloys.
Operating from a state-of-the-art 29,000 square meter factory, Kepai is a pioneer in oxygen-free and high-conductivity tellurium copper alloys. Backed by independent intellectual property rights, our proprietary manufacturing processes consistently deliver the high performance required for demanding, high-end industrial applications.
In today's highly dynamic global economy, maintaining reliable material supplies is a core strategic requirement. Sichuan Kepai integrates advanced digital technologies and optimized logistics networks to deliver robust and highly responsive supply chain solutions.
Our production facilities utilize modern horizontal continuous casting and extrusion lines. Equipped with automated monitoring systems, this advanced equipment controls alloy composition, structural grain size, and oxide inclusion limits in real time.
Located in Sichuan, Kepai leverages extensive logistics networks that directly link to major global shipping ports. This strategic access ensures efficient transit times for both land-based rail corridors and ocean freight lanes.
Our quality management systems are fully certified to international standards, including ISO 9001:2015, ISO 14001:2015, and OHSAS 45001:2018. We maintain strict compliance with European RoHS and REACH directives for sustainable manufacturing.
Pure copper and copper alloys are key enabling materials across a broad range of sectors, providing high-efficiency thermal management, reliable electrical power transfer, and corrosion resistance.
Due to its high thermal and electrical conductivity, pure copper is the ideal material for high-voltage battery busbars, electric motor rotors, and fast-charging connectors. It helps minimize system losses and optimize range efficiency.
Pure copper offers excellent antimicrobial, antioxidant, and anti-inflammatory properties. These natural features make it highly valuable for antimicrobial surfaces, MRI shielding systems, and specialized clinical diagnostic tools.
High-conductivity copper wire and rods are critical elements in aircraft power generation systems, signal guidance networks, and communications instrumentation, delivering reliable performance in harsh flight environments.
Copper alloys offer strong natural resistance to marine biofouling and saltwater corrosion. This makes them highly suitable for offshore drilling platforms, heat exchangers, shipboard seawater systems, and coastal structures.
Additional High-Performance Application Fields: Plasma Cutting Electrodes, Laser Welding Contact Tips, High-Voltage Power Transmission Connectors, Solar Photovoltaic Grid-Ties, Utility-Scale Battery Storage Systems, and Heavy-Duty Spring Contacts.
Our specialized R&D team continuously refines production methodologies and material properties to meet the evolving demands of our global partners.
Kepai operates an independent research facility equipped with advanced casting, drawing, and microstructural analysis instruments. This end-to-end setup allows us to monitor structural evolution from the raw melt stage through to the finished, precision-drawn rod.
Beyond standard copper alloys, Kepai has successfully developed high-conductivity, oxygen-free tellurium copper. Compared with standard commercial grades, this material offers lower impurity profiles and improved cold workability.
Global Certification Compliance Portfolio:
Essential technical insights and common questions addressed by our metallurgy experts to assist procurement officers and design engineers.
C11000 Electrolytic Tough Pitch (ETP) copper is the standard high-conductivity grade, containing a small amount of controlled oxygen to scavenge impurities, yielding a typical electrical conductivity of 100% to 101% IACS. However, it is susceptible to hydrogen embrittlement when exposed to reducing atmospheres at elevated temperatures.
C10100 Oxygen-Free Electronic (OFE) copper is melted under strict vacuum conditions, reducing the oxygen content to less than 0.0005% (5 ppm). This refined structure yields a conductivity of at least 101% IACS, eliminates the risk of hydrogen embrittlement, and is highly suitable for high-vacuum and electronic applications.
Pure copper is highly ductile and challenging to machine on high-speed CNC equipment, often producing long, continuous stringy chips that can bind tools.
Adding trace amounts of Tellurium (0.4% - 0.7%) forms tiny copper telluride (Cu2Te) precipitates within the copper matrix. These act as natural chip breakers during machining, increasing the machinability index from 20 to 85. This allows for significantly faster cutting feeds and speeds while retaining over 93% of the material's original electrical conductivity.
Our production line utilizes high-purity cathode copper as feedstock. Chemical compositions are checked before casting using advanced optical emission spectrometers (OES).
Our continuous extrusion and cooling processes maintain a consistent, refined grain structure. Regular non-destructive eddy current testing is also performed to identify and eliminate sub-surface voids or physical defects.
Yes. All our specialized tellurium, sulfur, and pure oxygen-free copper rods conform strictly to EU RoHS 2.0 (Directive 2011/65/EU) and REACH criteria. For leaded alloys, such as C36000 lead brass, we offer specialized options that comply with the strict lead exemptions permitted for electronic components and industrial fixtures.
We provide comprehensive OEM customization. Our manufacturing lines can supply round, square, hexagonal, and custom profile shapes in specific tempers (e.g., hard, half-hard, annealed). Diameters can be drawn from 2.0 mm up to 120 mm with precise dimensional tolerances to suit your specific CNC or extrusion systems.
Comprehensive metallurgical options for high-conductivity and high-wear applications.
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Sichuan Kepai provides reliable material options, consistent chemical composition control, and robust supply chain solutions. Contact our engineering team today to request a quote or order a technical sample.
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