Precision-engineered materials providing superior mechanical workability and high electrical conductivity for global high-tech industries.
In the modern era of high-speed precision manufacturing, the choice of materials determines the boundary between standard output and bleeding-edge efficiency. Sulphur Copper (primarily designated under UNS C14700) stands as a monumental solution for industries seeking to reconcile two traditionally conflicting material properties: exceptional electrical/thermal conductivity and superior free-cutting workability.
Historically, leaded coppers were deployed to achieve high machinability. However, with the imposition of strict global environmental directives, including RoHS (Restriction of Hazardous Substances) and REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals), the demand for lead-free alternatives has surged. Sulphur Copper offers a clean, compliant, and highly functional replacement, rendering a machinability rating of 85% relative to free-cutting brass (C36000), while maintaining electrical conductivity upwards of 90% to 98% IACS (International Annealed Copper Standard).
An in-depth analysis of metallurgical profiles, processing mechanics, and global market positioning for Sulphur Copper and advanced copper systems.
The exceptional characteristics of Sulphur Copper (C14700) lie in its precise chemical composition. Typically containing 0.2% to 0.5% sulfur (S) and a minimum of 99.5% pure copper (Cu), this alloy operates via a dual-phase microstructure. The addition of sulfur forms cuprous sulfide (Cu2S) particles which disperse evenly throughout the copper matrix. During cutting operations, these Cu2S precipitates act as natural chip breakers, preventing the formation of long, continuous, and hazardous ribbons of scrap copper that typically clog high-precision lathe spindles.
Crucially, because sulfur has negligible solid solubility in copper at room temperature, it does not distort the copper lattice. This preservation of lattice uniformity ensures that electron scattering is minimized. Consequently, electrical conductivity remains close to the theoretical limits of oxygen-free copper, establishing Sulphur Copper as the premier choice for electrical contacts and high-amperage terminals.
| Alloy Grade | Composition Key Elements | Machinability Rating | Electrical Conductivity (IACS) | Key Industrial Application |
|---|---|---|---|---|
| Sulphur Copper (C14700) | Cu: 99.7%, S: 0.3% | 85% | 90% - 95% | EV Charging Pins, CNC Precision Connectors |
| Tellurium Copper (C14500) | Cu: 99.5%, Te: 0.5% | 85% | 93% - 98% | Plasma Cutting Nozzles, High-Current Relays |
| Beryllium Copper (C17300) | Cu: 97.7%, Be: 1.9%, Pb: 0.4% | 60% | 22% - 30% | High-Stress Aerospace Bearings & Contacts |
| Pure Copper (C11000) | Cu: 99.9% | 20% | 101% | General Busbars, Electrical Grounding |
As heavy machinery, aerospace networks, and telecommunication infrastructure expand, material procurement strategies have shifted towards high-integrity manufacturers who guarantee long-term supply chain security. As a leading exporter of special copper alloys, Sichuan Kepai New Material Co., Ltd. addresses the global demand for sustainable procurement. Our strategic positioning in Sichuan Province, adjacent to National Highway 108, facilitates highly efficient land, rail, and sea logistics routes that minimize lead times to major shipping ports.
The rise of 5G technologies, electric vehicles, and automation has triggered a structural supply gap for high-performance conductors. OEMs and global engineering networks require manufacturers capable of scaling customized runs without compromising physical tolerances or environmental standards. Kepai’s comprehensive production portfolio—ranging from smelting, extrusion, drawing, and straightening to final non-destructive testing—offers an integrated, zero-risk solution for global engineering pipelines.
"Sichuan Kepai New Material Co., Ltd. maintains a multi-tier Quality Management System compliant with international standards. By integrating continuous vertical casting, cold-drawing technology, and automated eddy current detection, we ensure that every batch of Sulphur Copper shipped overseas is free from subsurface inclusions, micro-voids, and mechanical anomalies."
Our research and development pipeline is currently focused on the synthesis of multi-element micro-alloyed coppers. By adding trace concentrations of elements like zirconium or tin to the sulfur-copper matrix, Kepai's engineering team is targeting tensile strengths exceeding 400 MPa while maintaining electrical conductivities above 88% IACS. This next-generation alloy family will allow engineers to design smaller, lighter, and more durable power connectors for ultra-fast EV chargers, directly supporting the transition to 800V-1000V drivetrain systems.
Sichuan Kepai New Material Co., Ltd.
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 advanced metallurgical solutions are mainly applied in high-tech fields such as new energy vehicles, 5G technology, laser cutting, and lithium battery relays. Situated in the western area of the Sichuan Guanghan Industrial Development Zone, we offer convenient logistics networks that serve as a solid foundation for rapid international enterprise distribution.
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.
We implement eco-friendly smelting practices, capture emission gases effectively, and utilize scrap recycling loops that minimize the carbon footprint of our copper production processes.
A closer look at our technical capabilities, diverse product portfolio, market reach, and corporate values.
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.
Our complete in-house processing setup ensures total traceability, precise dimensions, and defect-free alloy products.
Smelting System
Laying-off Machine
Extrusion Press
Precision Drawing
Straightening Line
Automated Packaging
Eddy Current Conductance
Chemical Composition Lab
Metallographic Polisher
Electro-hydraulic Servo UTM
LCD Electronic UTM
Digital Hardness Tester
Our operational processes and material products are fully verified and certified to comply with international reliability standards.
Critical metallurgical answers for procurement specialists and design engineers regarding high-performance copper alloy integration.
Explore our complete metallurgical catalog for advanced electronics, metallurgy, and industrial components.
Looking ahead, Sichuan Kepai New Materials Co., Ltd. will continue to uphold its original intention, with even greater enthusiasm and determination, to engage in research and application in the field of new materials, contributing to the development of the new copper alloy materials industry in China and globally. We look forward to working hand in hand with friends from all walks of life to create a brilliant future together!
Kepai
