Direct sourcing channels representing standard-defining tellurium copper and industrial-grade high-strength non-ferrous formulations.
Established in May 2017, Sichuan Kepai New Materials Co., Ltd. is a high-tech private enterprise specializing in the R&D, precision production, and global sales of premium high-conductivity and high-strength free-cutting tellurium copper and other specialized copper alloys. Over the years, we have positioned ourselves as a key partner for industries demanding raw materials of extreme thermal stability and electrical performance.
Our processing ecosystem seamlessly integrates research, manufacturing, and technical application services, allowing us to serve global manufacturing networks looking for sustainable, reliable, and standardized metallurgy supply chains.
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Bridging the gap between superior electrical conductivity and extreme mechanical machinability.
The Core Challenge: In electronic engineering, power generation, and precision machining, traditional materials face an persistent engineering compromise. Pure copper (such as C11000) provides exceptional electrical and thermal conductivity, yet it is notoriously difficult to machine due to its high ductility, leading to tool wear, massive burrs, and high scrap rates. Conversely, free-cutting brass (C36000) is easily machined but provides less than 28% IACS conductivity.
The Metallurgical Cure: Tellurium Copper (ASTM C14500) expertly resolves this compromise. By alloying 99% pure copper with a highly controlled 0.4% to 0.7% tellurium content, metallurgical engineers introduce micron-level telluride inclusions uniformly distributed throughout the copper matrix. This structure acts as a natural chip-breaker during high-speed CNC milling and turning, giving the alloy a machinability rating of 85% relative to free-cutting brass, while maintaining more than 93% to 98% IACS electrical conductivity.
Kepai's Technical Breakthrough: Oxygen-Free Tellurium Copper (OFT)
Conventional C14500 contains copper-oxide phases, which present a high risk of hydrogen embrittlement when subjected to high-temperature brazing or welding. Sichuan Kepai developed a proprietary oxygen-free high-conductivity tellurium copper (OFT) system. By smelting high-purity cathode copper under vacuum and introducing controlled deoxidization steps, we limit oxygen levels below 10ppm. The result is a highly stable, non-embrittling alloy suitable for aerospace vacuum systems and heavy welding processes.
| Alloy Grade | UNS Designation | Copper (Cu) Content | Tellurium (Te) Content | Oxygen (O) Limit | Electrical Cond. | Machinability Rating |
|---|---|---|---|---|---|---|
| OFT Copper | Custom Kepai OFT | >99.95% | 0.4 - 0.7% | <10 ppm | >98% IACS | 85% (Excellent) |
| C14500 Standard | C14500 | >99.3% | 0.4 - 0.7% | N/A | >93% IACS | 85% (Excellent) |
| C11000 ETP | C11000 | >99.90% | 0% | <400 ppm | 100% IACS | 20% (Poor) |
| C10100 OFE | C10100 | >99.99% | 0% | <5 ppm | 101% IACS | 20% (Poor) |
Modern global logistics require extreme raw material consistency, robust risk mitigation, and flexible scale. Driven by automated processes and strict quality systems, Sichuan Kepai New Materials operates as a benchmark for high-performance copper extrusion, drawing, and finished product fabrication.
Our 29,000-square-meter facility features automated vacuum melting induction furnaces, continuous casting systems, modern planetary rolling mills, and multi-stage precision cold-drawing lines. This advanced equipment ensures that every batch of tellurium copper rods, wires, tubes, or sheets maintains chemical homogeneity with minimal mechanical variation.
A full range of specialized alloys engineered for aerospace, electronic systems, marine engineering, and electric automotive infrastructure.
C19160 (CuNiSiCr) is a high-performance precipitation-strengthened copper-nickel-silicon alloy. Strengthened through proprietary heat treatments, it delivers exceptional tensile strength alongside high electrical conductivity and outstanding thermal softening resistance.
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C26000 is an engineering alloy combining excellent cold-forming and drawing capabilities with robust mechanical properties. Perfect for producing deep-drawn connectors, ammunition shells, and complex metal stampings.
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A classic tin-phosphorus bronze alloy (CuSn4) engineered for spring contacts and precision electronics. Outstanding fatigue resilience, high wear resistance, and absolute protection against stress-relaxation under heat.
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A multi-element copper-tin-phosphorus alloy offering exceptional sliding wear characteristics, good machinability, and superior spring efficiency. Perfect for sleeve bearings, thrust washers, and high-frequency connectors.
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High-strength, precipitation-hardening copper alloy with a minor lead addition to enhance machinability. Ideal for highly intricate machined contacts and heavy-duty spring-pin interfaces requiring long cycles.
View Technical DataFeaturing the absolute highest mechanical strength among all copper-base alloys, our C17200 foils provide unmatched elasticity, fatiguing thresholds, and reliable corrosion protection for micro-switches and diaphragms.
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Hailed as the standard benchmark for industrial machinability, C36000 delivers maximum throughput during high-speed CNC milling and automatic lathe fabrication, keeping processing costs low.
View Technical DataExceptional thermal and electrical conductivity values (minimum 100% IACS). Designed for Li-ion battery current collectors, high-density transformer coils, and EMI/RFI shielding configurations.
View Technical DataSmelted in a protective inert atmosphere to ensure oxygen content is held below 5ppm. The primary choice for vacuum electronics, high-vacuum components, cryogenic vessels, and critical scientific apparatus.
View Technical DataEnsuring absolute compliance, seamless documentation, and reliable global delivery across diverse industrial environments.
We leverage independent intellectual property rights to produce Oxygen-Free High Conductivity Tellurium Copper, providing the international market with dynamic alloys that eliminate hydrogen embrittlement risks.
Our management and manufacturing protocols are strictly certified to ISO9001:2015, ISO14001:2015, and OHSAS 45001:2018, meeting rigorous global requirements for quality and safety.
By using clean induction melting equipment and keeping scrap recovery loops tightly sealed, we prioritize reduced-carbon footprints and full environmental accountability.
Providing custom physical properties and tailored alloy formulations across diverse global markets.
Copper alloys provide excellent antimicrobial performance, high electrical accuracy, and reliable stability, making them crucial for imaging chambers and surgical instruments.
Our high-conductivity alloys are engineered for high-power DC fast-charging ports, battery interconnection terminals, and robust power electronics modules.
Our Oxygen-Free Tellurium Copper provides exceptional resistance to hydrogen embrittlement, ensuring absolute reliability in high-vacuum systems and avionics contacts.
Outstanding resistance against marine biofouling and saline corrosion makes our specialized bronze and copper alloys ideal for offshore exploration hardware.
Tellurium copper is highly valued in the laser and plasma cutting industries for its ability to withstand severe thermal stress while maintaining precise electrical currents.
Providing durable grounding grids, distribution busbars, and solar array interconnects engineered to withstand decades of heavy outdoor service.
How四川科派 is designing next-generation conductive alloys to keep pace with evolving clean tech platforms.
Our long-term R&D is focused on further reducing energy consumption per ton during vacuum smelting. By using clean electricity and optimizing cooling systems, we are moving toward our goal of net-zero production phases for high-purity non-ferrous raw materials.
As micro-electronic interfaces demand higher currents in smaller footprints, our research labs are developing advanced ternary and quaternary alloy configurations. These include trace chromium and zirconium additions to enhance strength and resist thermal creep up to 400°C.
By optimizing our continuous extrusion machinery, we aim to produce near-net-shape custom profiles. This reduces machining scrap for downstream manufacturers, optimizing material utilization across the supply chain.
Clear, direct answers to common technical and logistical questions from procurement managers and design engineers.
ETP Copper (C11000) generates long, gummy chips that wrap around cutting tools, leading to rapid heat buildup, tool wear, and poor surface finishes. Because C14500 features fine copper telluride inclusions, it produces short, brittle chips that clear quickly from the tool. This enables up to 4 times higher cutting feeds and speeds while maintaining over 93% IACS electrical conductivity.
Oxygen-Free Tellurium Copper limits dissolved oxygen content to under 10 ppm. When standard C14500 is brazed or welded in hydrogen-rich atmospheres, oxygen atoms react to form internal high-pressure steam pockets, leading to cracking (hydrogen embrittlement). Our specialized Oxygen-Free Tellurium Copper prevents this, making it ideal for medical vacuum chambers, high-energy physics equipment, and heavy welding assemblies.
All Kepai shipments undergo strict validation and can be certified to ISO 9001:2015 (Quality), ISO 14001:2015 (Environment), and ISO 45001:2018 (Occupational Health and Safety). Our products also comply fully with EU RoHS and REACH directives, ensuring safe, hassle-free integration into European and American supply chains.
The copper telluride (Cu2Te) phase acts as a micro-structural solid lubricant, lowering the friction coefficient at the tool-chip interface. This dramatically reduces cutting forces and tool-edge built-up, extending carbide tool life by up to 300% compared to machining pure, non-alloyed copper.
Premium non-ferrous and specialized copper alloy products ready for international shipment.
Need custom dimensions, dynamic mechanical tolerances, or specialized oxygen-free formulations? Contact our engineering team for expert assistance and comprehensive quotes.
Kepai New Material