Select high-performance copper grades customized for challenging environmental conditions
Premium precipitation-hardening copper alloy exhibiting ultimate tensile strength up to 1400 MPa and excellent spring resilience attributes.
Free-cutting micro-alloy with elevated machinability indexing (85%), optimal structural rigidity, and excellent electrical conductivity.
A premier selection for plasma nozzles and high-amperage connectors. Optimized for precision automatic lathed structural parts.
Ultra-pure oxygen-free copper featuring electrical conductivity exceeding 101% IACS. Extremely low hydrogen embrittlement susceptibility.
Engineered for critical tribological applications, showcasing self-lubrication, anti-seizure capacity, and outstanding wear resistance.
Proprietary high-conductivity, oxygen-free tellurium copper. Solves the trade-off between machinability and electrical conductivity.
Designed to optimize automated tool life, reduce machining heat, and maintain stable current pathing under high temperatures.
Top-grade raw material supply featuring strict tolerance control, uniform phase distribution, and excellent cold-workability.
Established in May 2017, Sichuan Kepai New Materials Co., Ltd. is a high-tech private enterprise specializing in the R&D, production, and sales of high-conductivity and high-strength free-cutting tellurium copper, oxygen-free copper, and other special copper alloys. With our modern 29,000 square meter factory floor space, we support global manufacturing industries with certified material processing expertise.
Our core focus is solving the engineering trade-offs of copper alloys: ensuring high electrical/thermal conductivity while enhancing tensile strength, wear resistance, and machinability. Through independent intellectual property rights, we are driving innovation across global supply chains.
In modern industrial applications, pure copper (Cu > 99.9%) and its alloys form the backbone of electrical, automotive, and thermodynamic systems. As a leading pure copper manufacturer and exporter, Sichuan Kepai New Materials has developed a deep understanding of metallurgy, production consistency, and performance optimization required by engineers worldwide.
Sourcing pure copper requires distinguishing between core material categories. Electrolytic Tough Pitch (ETP) Copper (C11000) is the industry standard for general electrical applications, maintaining a minimum nominal conductivity of 100% IACS. However, for specialized microelectronics and high-vacuum operations, ETP's oxygen content (~400 ppm) can cause hydrogen embrittlement when exposed to reducing atmospheres at elevated temperatures.
To prevent this failure mechanism, Kepai produces high-purity Oxygen-Free High Conductivity (OFHC) Copper (C10100 & C10200). With oxygen levels controlled below 10 ppm, these grades offer superior ductility, high thermal and electrical conductivity (exceeding 101% IACS), and a high-vacuum-compatible structure that prevents gas outgassing under extreme heat.
| Copper Grade | UNS Designation | Min. Cu Content | Electrical Conductivity | Key Advantage |
|---|---|---|---|---|
| Electrolytic Tough Pitch (ETP) | C11000 | 99.90% | 100% IACS | General-purpose electrical wiring and busbars |
| Oxygen-Free Electronic (OFE) | C10100 | 99.99% | 101% IACS | High-vacuum environments, semiconductor tooling |
| Tellurium Copper (TeCu) | C14500 | 99.20% (plus Te) | 93% - 98% IACS | 85% machinability; high strength and heat resistance |
| Beryllium Copper (BeCu) | C17200 | 98.10% (plus Be) | 22% - 28% IACS | Precipitation hardened; tensile strength up to 1400 MPa |
“The selection of copper alloys is no longer a search for raw conductivity; it is a balance of mechanical durability, machinability, and thermal stability in high-amperage systems.”
Sourcing from China provides a clear competitive edge, particularly when partnering with an integrated manufacturer like Sichuan Kepai. Our advantages include:
The global copper market is shifting towards high-purity, environmentally friendly, and micro-alloyed materials. These changes are driven by three major macro trends:
New Energy Vehicles (NEVs) require reliable high-current power transmission. From EV battery busbars to charging ports, components are subjected to high thermal loads and vibration. High-conductivity alloys like Tellurium Copper (C14500) and Sulfur Copper (C14700) are essential here, as they allow for fast machining while maintaining the necessary electrical efficiency.
As microchips become smaller and more powerful, the packaging and heat-dissipation substrates require high thermal conductivity and low thermal expansion. Ultra-pure oxygen-free copper and copper-nickel-silicon alloys are increasingly used in these high-reliability electronics to prevent thermal fatigue.
International environmental directives are restricting lead content in copper alloys. In response, Kepai's research team has developed lead-free, highly conductive alternatives. By utilizing micro-alloying elements like tellurium and sulfur, we achieve free-machining performance without using hazardous heavy metals, ensuring compliance for global importers.
Our materials support critical infrastructure, advanced electronics, and marine applications
Our facilities operate under international standards to ensure batch-to-batch consistency
Our in-house metallurgy experts control the entire production pipeline, from material design to final physical testing, ensuring consistent alloy properties.
Equipped with high-vacuum induction furnaces, continuous casting lines, and multi-stage cold drawing equipment to achieve tight dimensional tolerances.
Developed our proprietary oxygen-free tellurium copper, combining high electrical conductivity with the free-machining performance needed for automation.
Certified to ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018 standards, ensuring strict quality control and environmental compliance.
We participate in drafting national and industry standards for Chinese copper alloys, establishing ourselves as a trusted technical resource.
Focused on sustainability, we offer RoHS-compliant, lead-free free-cutting alloys that help global partners meet environmental requirements.
Kepai supplies high-conductivity copper alloys to both domestic and international markets. Our products are exported to manufacturing hubs in North America, Europe, East Asia, and the Middle East.
We work with international logistics partners to ensure timely customs clearance and secure container shipping, keeping global supply chains running smoothly.
Electrolytic Tough Pitch (ETP) C11000 has a copper purity of at least 99.90% but contains about 0.02% to 0.04% oxygen. Oxygen-Free High Conductivity (OFHC) C10100 has a higher purity of 99.99% and contains less than 10 ppm (0.001%) oxygen. OFHC copper is preferred for high-vacuum applications, electronic packaging, and components prone to hydrogen embrittlement when heated.
Pure copper is soft and ductile, which can lead to tool wear and long, stringy chips during machining. C14500 Tellurium Copper contains 0.4% to 0.7% tellurium, which acts as a chip breaker. This increases the material's machinability rating to 85% (compared to 20% for pure copper) while retaining 93% to 98% of its electrical conductivity. It is commonly used for plasma cutting nozzles, electrical connectors, and lathing operations.
Beryllium copper (such as C17200) undergoes precipitation hardening. Following a solution heat treatment and aging, beryllium precipitates out of the copper matrix, blocking crystal dislocations. This structural change yields a tensile strength of up to 1400 MPa—comparable to high-strength steels—while maintaining electrical conductivity in the range of 22% to 28% IACS. This combination is essential for heavy-duty spring contacts and connectors.
Our quality control program operates under ISO 9001:2015. We conduct spectrographic analysis on every melt batch to verify chemical composition. We also perform mechanical testing (tensile, hardness) and eddy current conductivity checks on finished profiles. Full mill test certificates (MTC) containing material chemical and physical test data are provided with all international shipments.
To comply with RoHS and REACH regulations, we offer Tellurium Copper (C14500) and Sulfur Copper (C14700). These alloys provide high machinability and conductivity without the addition of lead, helping manufacturers meet environmental compliance requirements in European and North American markets.
Get in touch with our technical team to request material data sheets, obtain pricing, or discuss custom alloy compositions for your production requirements.
Submit InquirySelect copper alloys for high-strength electrical applications and heavy-duty structural parts
High-purity ETP copper profiles, providing excellent conductivity and formability for power distribution busbars and grounding terminals.
Designed for deep drawing, stamping, and forming operations. Offers balanced ductility, tensile strength, and corrosion resistance.
The industry standard for free-machining operations, providing high production efficiency and excellent tool life for precision components.
Provides high tensile strength among copper-beryllium alloys, suitable for heavy-duty spring contacts and instrumentation parts.
Combines moderate strength with good electrical and thermal conductivity, suitable for resistance welding electrodes and electrical spring contacts.
High-performance material grades designed for demanding industrial environments, providing wear resistance and thermal stability.
Free-machining beryllium copper containing lead to improve tool feed rates while maintaining spring properties and fatigue resistance.
Features high thermal conductivity combined with mechanical strength, suitable for injection mold components and electrical switchgear.
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