High-purity specifications engineered to meet international precision stamping, welding, and conductivity standards.
Deciphering Metallurgy, Precipitation Hardening Mechanisms, and Advanced Component Dynamics
In the landscape of modern electronics, micro-electromechanical systems (MEMS), and aerospace instrumentation, the demand for thin-gauge metal foils possessing an extraordinary combination of mechanical strength, high electrical conductivity, and thermal endurance is paramount. Custom Beryllium Copper Foil (BeCu) represents the pinnacle of high-performance copper-based metallurgy, overcoming the physical limitations of conventional phosphor bronzes, brasses, and standard copper-nickel alloys. By leveraging precise heat treatment profiles, precipitation hardening allows beryllium copper foils to achieve tensile strengths comparable to high-strength alloy steels while maintaining a major percentage of pure copper's electrical conductivity.
Beryllium copper foils are classified into two major categories depending on the alloying elements and target performance parameters: High-Strength Alloys (typically C17200, containing 1.8% to 2.0% Beryllium) and High-Conductivity Alloys (such as C17500 and C17510, which integrate cobalt or nickel alongside a lower beryllium composition of 0.2% to 0.7%).
During the casting and rolling stages at our partner factories, beryllium copper undergoes solution annealing to create a supersaturated solid solution. In this state, the material is highly ductile and can be cold-rolled into extremely thin gauges, down to thicknesses of 0.01 mm, without fracturing. Upon mechanical forming into final components, a precipitation hardening (age-hardening) thermal treatment is applied at temperatures ranging from 315°C to 480°C. This cycle causes sub-microscopic beryllium-rich particles (known as GP zones) to precipitate within the copper matrix, blocking dislocation pathways and multiplying the yield strength of the foil up to five-fold.
| Alloy Designation | Beryllium Content (%) | Electrical Conductivity (IACS %) | Tensile Strength (MPa) | Elastic Modulus (GPa) | Primary Applications |
|---|---|---|---|---|---|
| UNS C17200 (BeCu) | 1.80 - 2.00 | 22 - 28 | 1100 - 1400 | 131 | Spring contacts, shield finger strips, sensor diaphragms, bellows |
| UNS C17500 (Be-Co-Cu) | 0.40 - 0.70 | 45 - 60 | 680 - 960 | 138 | Resistance welding components, high-current connectors, switches |
| UNS C17510 (Be-Ni-Cu) | 0.20 - 0.60 | 45 - 60 | 680 - 960 | 138 | Heavy duty automotive electrical switches, high-frequency connectors |
| UNS C14500 (Tellurium Copper) | 0.00 | 90 - 98 | 250 - 380 | 117 | High-speed machining parts, electrical connectors, plasma torch tips |
Beryllium copper stands out because of its unique mechanical response to cyclical load stresses. In high-vibration and high-frequency environments, standard copper alloys quickly reach their fatigue limit and undergo catastrophic failure. Beryllium copper foils retain their mechanical integrity over hundreds of millions of cycles, making them the industry standard for diaphragm sensors and spring loaded contact terminals. Additionally, they resist stress relaxation under elevated temperatures, maintaining constant contact force even when exposed to operational temperatures exceeding 150°C. This thermal stability prevents high electrical resistance and subsequent thermal runaway in tight electronics spaces.
Sichuan Kepai New Materials Co., Ltd., established in 2017, is a high-tech enterprise integrating research and development, production, and sales. Currently, the factory covers an area of approximately 9,000 square meters, with an office space of about 1,000 square meters. The company primarily engages in the production of strategic emerging new materials for the national 13th Five-Year Plan, including special copper alloys such as tellurium copper, high-conductivity oxygen-free copper, silver copper, and dispersion copper, while also focusing on the research and development of high-conductivity, easy-to-machine, high-strength copper alloys. Our products are mainly applied in high-tech fields such as new energy vehicles, 5G technology, laser cutting, and lithium battery relays.
Our company is strategically located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108. This superior geographical position provides seamless access to major logistics channels and raw material hubs, laying a solid foundation for the rapid development of the enterprise. Since its establishment, Kepai has adhered to the business philosophy of "innovation-driven development, quality wins the market," committed to providing customers with the highest quality high-end copper alloy materials, and promoting industrial upgrading and sustainable development.
Why global OEMs choose Chinese precision metallurgy for high-reliability components
Deploying specialized alloys in next-generation manufacturing platforms
The transition to electric vehicles places immense demand on automotive electronic hubs. High-current relays, battery management systems (BMS), and electric drivetrain components must handle extreme electrical loads under continuous heat and mechanical shock. Our high-conductivity beryllium copper foils (C17500 / C17510) and chromium zirconium copper alloys (C18150) offer high electrical and thermal conductivity combined with mechanical strength, preventing safety contact degradation over long-term vehicle operation.
High-speed wireless networks rely on pristine signal transmission with minimal attenuation. Interconnection components, coaxial connectors, and shielding elements require thin-gauge foils with zero surface defects and high electrical conductivity. Our thin-rolled C17200 foils provide spring-loaded shielding solutions that protect delicate RF circuits from electromagnetic interference (EMI) while minimizing signal loss at higher GHz bands.
In high-precision plasma and fiber laser cutting systems, material wear at the nozzle leads to degradation of cutting quality. Tellurium copper (C14500) and sulfur copper (C14700) are engineered to withstand extreme temperatures while maintaining excellent free-machining attributes. These alloys allow manufacturers to produce cutting tips that deliver stable gas flow dynamics and prolonged operational lifespans.
| Alloy & Type | Key Performance Attribute | Automotive / EV Application | Telecommunications / 5G | Energy & Heavy Industry |
|---|---|---|---|---|
| C17200 Foil | Ultra-High Yield Strength & Fatigue Limit | Sensor diaphragms, micro-relays | EMI shielding gaskets, connectors | Precision spring contacts, bellows |
| C17510 Foil | Balanced Electrical Conductivity & Toughness | BMS high-current terminals | Transmitter modules, power blocks | Heavy-duty switchgear plates |
| C18150 Rods/Plates | High Softening Temperature & Corrosion Resistance | Resistance welding electrodes | Antenna backing structures | Power grid switch contacts |
| C14500 Rods | High Machinability & Heat Dissipation | EV charging connector contacts | Precision coaxial pins | Plasma cutting torches & nozzles |
Advanced production and testing capabilities at Sichuan Kepai New Materials
Technological innovation is the core competitiveness of Sichuan Kepai New Materials Co., Ltd. The company has a research and development and production team composed of senior industry experts who keep pace with international cutting-edge technology trends and continuously explore the unknown boundaries in the field of new copper alloy materials. Through a combination of independent research and development and industry-university-research collaboration, Kepai has made breakthrough progress in several areas, including high-performance tellurium copper, lead copper, and sulfur copper. Many of its technological achievements have reached international advanced levels and have been successfully applied in various industries such as new energy vehicles, precision machining parts, plasma cutting, relays, and energy storage, earning widespread recognition and praise in the market.
Kepai's product line is rich and diverse, covering a comprehensive range of solutions from basic materials to high-end customization. We focus on providing customers with high-performance, high-quality high-end copper alloy products, including but not limited to pure copper, oxygen-free copper, oxygen-free high-conductivity tellurium copper, nickel tellurium copper, tin bronze, beryllium copper, lead bronze, sulfur copper, and chromium zirconium copper. These products play an important role in reducing production costs and enhancing product performance due to their excellent physical and chemical properties and environmental friendliness, creating significant economic and social benefits for customers.
In the face of global market competition, Sichuan Kepai New Materials adheres to the development strategy of "rooted in Sichuan, radiating nationwide, and moving towards the world." By continuously optimizing market layout and improving the sales network, we have established a stable customer base in multiple provinces and cities across the country and have formed long-term cooperative relationships with several internationally renowned enterprises. At the same time, the company actively expands into overseas markets, participates in international competition and cooperation, and strives to promote Kepai's brand influence on the global stage.
We understand that the long-term development of an enterprise is inseparable from an excellent corporate culture. We advocate the corporate spirit of "integrity, innovation, collaboration, and win-win," encouraging employees to explore boldly and innovate courageously, while also emphasizing teamwork and talent cultivation, striving to create a harmonious, open, and inclusive work atmosphere. We believe that only by continuously pursuing excellence and creating value can we win the trust of customers and the respect of society.
Precision machinery enabling complete control over physical, mechanical, and surface properties
A processing environment certified to meet rigorous global engineering and safety standard benchmarks
Mitigating regulatory, economic, and design risks in high-performance metallurgy procurement
As wearable consumer electronics, medical implants, and defense components decrease in size, demand for thinner foils is increasing. Standard production gauges of 0.05 mm are being replaced by ultra-thin 0.02 mm and 0.01 mm foils. Slicing copper alloys to these dimensions requires precise tension control during rolling and vacuum-annealing steps to prevent micro-cracking and work-hardening. Additionally, the industry is researching customized grain-refined structures to minimize springback variation, which helps ensure high yields during forming.
A primary consideration for global procurement managers is the environmental safety profile of beryllium-containing alloys. While solid beryllium copper in its finished state does not present inhalation hazards, working and manufacturing processes such as dry grinding or welding require appropriate ventilation systems. Our factories utilize wet processing, oil lubrication, and air scrubbing systems to protect workers. The finished, high-purity beryllium copper foils comply with RoHS and REACH regulations, as the beryllium remains locked in solid solution within the copper-cobalt-nickel matrix, posing no risk to end consumers.
Procuring specialized copper alloys demands consistency in both chemical compositions and physical geometries. Disruptions in material supply can halt automated production lines. By combining direct smelting, vertical continuous casting, and high-performance cold rolling mills, our factories offer stable material availability. We secure our raw materials domestically and maintain buffer reserves to support uninterrupted supply to global manufacturing clients in North America, Europe, and East Asia.
Direct technical insights to guide your metallurgical selection and application design
Explore our full line of specialized high-conductivity and high-strength copper formulations.
Kepai
