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C14700 Sulfur Copper (also known as free-machining copper or sulfurized copper) is a premium copper alloy containing approximately 0.2–0.7% sulfur. This addition of sulfur dramatically improves machinability — making it one of the most efficient copper materials for high-speed CNC machining, screw machine production, and automated manufacturing lines. With electrical conductivity typically exceeding 96% IACS and excellent thermal conductivity, C14700 strikes a rare balance between functional performance and manufacturing efficiency.
In Japan, C14700 Sulfur Copper has become an indispensable material across multiple high-value industries. Japan's manufacturing sector — renowned globally for its precision, reliability standards, and technological innovation — demands copper alloys that meet strict JIS (Japanese Industrial Standards) specifications while offering superior machinability. C14700 fits this requirement perfectly, and its adoption has grown steadily alongside Japan's expanding electronics, automotive, semiconductor, and 5G infrastructure sectors.
Japan's industrial ecosystem includes world-class OEMs, precision parts manufacturers (known as "monozukuri" companies), and tier-1 electronics suppliers who source high-performance copper alloys in significant volumes. The demand for C14700 Sulfur Copper from Japanese factories is driven by the need for materials that can be processed at high speeds with minimal waste — directly aligning with Japan's lean manufacturing philosophy (kaizen and muda elimination). Leading industrial zones such as Aichi Prefecture (automotive hub), Osaka (electronics and machinery), and Kanagawa (semiconductor and precision equipment) are key consumption centers for C14700 alloys.
Japan's automotive giants — including Toyota, Honda, and Denso — rely on C14700 Sulfur Copper for precision connector pins, relay components, terminal blocks, and EV charging contact parts. The alloy's high machinability enables mass production of complex geometries required in next-generation electric vehicles.
As Japan accelerates its nationwide 5G rollout, C14700 is widely used in RF connectors, antenna base components, and signal transmission parts. Its excellent electrical conductivity (≥96% IACS) ensures minimal signal loss in high-frequency applications critical for 5G base stations.
Japan's semiconductor equipment manufacturers and PCB producers use C14700 for lead frames, contact springs, and precision-machined electronic components. The alloy's dimensional stability and machinability are vital for micro-precision parts in IC packaging and testing equipment.
With Japan's push toward carbon neutrality by 2050, lithium battery manufacturers and energy storage system integrators increasingly adopt C14700 for relay contacts, battery management system (BMS) terminals, and busbar connectors due to its superior conductivity and corrosion resistance.
Japan's thriving precision parts machining industry (monozukuri) leverages C14700's exceptional free-cutting properties for producing hydraulic valve bodies, instrument fittings, watch components, and medical device parts. High-speed CNC machining with C14700 achieves superior surface finishes with extended tool life.
As Japanese factories embrace Industry 4.0 and smart manufacturing, C14700 Sulfur Copper is specified for robot joint contacts, servo motor commutators, and automation relay components — where consistent electrical performance and machinability are non-negotiable requirements.
Japan's commitment to achieving 100% EV sales by 2035 is creating unprecedented demand for high-conductivity copper alloys. C14700 Sulfur Copper, used extensively in EV charging infrastructure and powertrain components, is projected to see double-digit annual demand growth in the Japanese market through 2030.
Japanese manufacturers increasingly prioritize environmentally compliant materials. C14700 Sulfur Copper, which replaces lead-containing free-machining copper alloys, aligns perfectly with Japan's strict RoHS and REACH environmental regulations — making it the preferred choice for eco-conscious Japanese OEMs and export-oriented manufacturers.
Japan's Society 5.0 initiative is pushing factories toward digital material management. Suppliers of C14700 are adapting by providing digital material certificates, real-time quality traceability, and AI-driven quality control — features increasingly demanded by Japanese procurement teams at Tier-1 manufacturers.
Japanese manufacturers are actively diversifying their copper alloy supply chains beyond domestic sources. High-quality C14700 suppliers from China — particularly those meeting JIS standards and ISO 9001 certification requirements — are gaining traction as reliable, cost-competitive alternatives in Japan's industrial procurement landscape.
Japanese universities and research institutes (such as Tohoku University's Institute for Materials Research) are collaborating with copper alloy manufacturers to develop next-generation sulfur copper variants with enhanced properties — including higher strength, improved corrosion resistance, and optimized machinability for micro-precision applications.
Japan's ¥10 trillion semiconductor industry investment plan (including TSMC's Kumamoto fab and Rapidus's Hokkaido facility) is creating new demand for precision copper alloy components used in chip manufacturing equipment, cleanroom installations, and high-purity electrical contacts.
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.
The products are mainly applied in high-tech fields such as new energy vehicles, 5G technology, laser cutting, and lithium battery relays — all sectors where Japan's industrial demand is rapidly expanding.
Located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, boasting a superior geographical location and convenient transportation — providing a solid foundation for rapid global expansion including Japan's demanding market.
The company is located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, boasting a superior geographical location and convenient transportation, which lays 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.
For Japan's market specifically, Kepai's commitment to sustainable, lead-free copper alloy production aligns with Japan's environmental standards and green procurement policies. Our C14700 Sulfur Copper products are produced using environmentally responsible processes, meeting the requirements of Japanese customers who prioritize both performance and ecological responsibility.
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 including Japan, 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.
Smelting
Laying-off
Extrusion
Drawing
Straightening
Package
Eddy Current Conductance Instrument
Chemical Composition Test Room
Metallographic Sample Polishing Machine
Microcomputer Controlled Electro-Hydraulic Servo Universal Testing Machine
Liquid Crystal Display Electronic Universal Testing Machine
Hardness Tester
High Performance Tellurium Copper — Japan Precision Parts
C18150 Chromium-Zirconium Copper Alloy — Japan Industrial
C14500 Tellurium Copper Alloy — Japan EV & 5G
Beryllium Copper Alloy — Japan Semiconductor Use
UNS C51900 Copper Alloy — Japan Spring & Contact
Lead Copper Bronze — Japan Bearing & Bushing
C17510 Copper-Nickel-Beryllium — Japan Relay & Connector
High Performance Oxygen Free Copper — Japan Audio & Power
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 — including our valued partners in Japan — to create a brilliant future together!
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