Providing high-performance, precision-engineered copper alloys that drive industrial efficiency and sustainability globally.
Sulfur Copper (classified globally under UNS C14700 and DIN 2.1486) is a unique alloy engineered specifically to bridge the gap between high electrical conductivity and superior machinability. By introducing a controlled content of sulfur (typically between 0.2% and 0.7%) into highly refined oxygen-free copper, the resulting microstructure exhibits finely dispersed copper sulfide (Cu₂S) particles.
These microscopic inclusions act as natural chip breakers during high-speed CNC milling and Swiss-screw machining processes. Unlike leaded copper alloys, which pose environmental hazards, Sulfur Copper functions as a highly compliant, eco-friendly alternative while retaining up to 95% IACS (International Annealed Copper Standard) electrical conductivity.
Our specialized smelting processes ensure that these sulfides are distributed evenly along the longitudinal grain boundary pathways, yielding smooth surface finishes, reducing tool wear, and facilitating unmatched fabrication tolerances in precision contact pins, RF connectors, and plasma cutting nozzles.
| Property Standard | Sulfur Copper (C14700) | Tellurium Copper (C14500) | Leaded Copper (C18700) |
|---|---|---|---|
| Machinability Rating | 85% (Free-cutting) | 85% (Free-cutting) | 85% (Free-cutting) |
| Electrical Conductivity | ≥ 93% IACS | ≥ 93% IACS | ≥ 96% IACS |
| Thermal Conductivity | 355 W/(m·K) | 355 W/(m·K) | 365 W/(m·K) |
| RoHS/REACH Compliant | Yes (Lead-Free) | Yes | No (Leaded Exemption) |
| Hot Working Properties | Good | Excellent | Fair |
How modern manufacturing sectors leverage C14700 to overcome complex thermal and mechanical design challenges.
High-voltage charging infrastructure requires connectors that can withstand massive currents without generating localized heat. C14700's high thermal and electrical conductivity profile prevents thermal runaway in high-power charging sockets, while its high machinability facilitates the production of intricate internal connection terminals.
Precision coax connectors, signal relays, and transmission terminals operating at millimeter waves require zero surface defects. Sulfur Copper's chip morphology allows ultra-smooth finishes, reducing microwave skin-depth signal loss and ensuring long-term signal integrity without mechanical wear.
Plasma cutting torch nozzles require materials that stand up to high heat and resist spatter buildup. C14700 provides optimal thermal dispersion to prevent heat accumulation, while remaining easy to machine to extremely tight dimensional tolerances for stable gas flow dynamics.
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.
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.
Our proprietary manufacturing workflow from raw material smelting to molecular testing guarantees the highest purity and uniformity.
Using high-frequency vacuum melting furnaces to refine pure copper inputs, ensuring oxygen levels are consistently kept below 10ppm. Sulfur or tellurium elements are strictly added through a nitrogen-shielded injection system to prevent oxide contamination.
Cast billets are subjected to intense thermal homogenization before extrusion. Under specific temperature brackets, the eutectic sulfur phases are broken down into sub-micron particle bands, aligning with the grain layout to allow perfect chip fracture without brittle failure.
Drawn through diamond dies to establish final diameter tolerances up to +/-0.01mm. Cold working sequences are calibrated to achieve the required hardness temers (such as H02 half-hard or H04 hard) optimized for direct feed into high-speed automatic Swiss lathe systems.
Every bar passes through online eddy current testing systems to identify subcutaneous voids, cracks, or non-metallic inclusions. Magnetic sorting guarantees uniform conductivity along the entire length of the rod.
Integrating forward-thinking metallurgy, diverse product offerings, and globally certified operations.
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.
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 production backed by scientific verification ensures batch-to-batch consistency and zero defect rates.
Our operations comply strictly with international metallurgical protocols, ISO system qualifications, and eco-friendly standards.
As a prominent exporter sending high-performance copper materials across the Americas, EU, and Asia-Pacific regions, Sichuan Kepai ensures all sulfur copper orders meet rigorous global standards. Our C14700 alloys are verified for compliance under RoHS (Directive 2011/65/EU) and REACH, providing full material trace data sheets (MDS) for integration into the International Material Data System (IMDS) used by global automotive OEMs.
Our strategic export facilities coordinate specialized anti-tarnish packaging. Using vapor corrosion inhibitors (VCI) and moisture barrier protective films, we guarantee that precision copper bars and wires arrive at your ports oxide-free, ready to feed directly into CNC machinery without surface preparation delays.
Metallurgical answers to help procurement managers and design engineers choose the best high-conductivity copper alloys.
Our complete line of performance copper alloys engineered for high-conductivity and heavy-duty industrial applications.
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