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Precision-engineered oxygen free copper alloys optimized for welding electrodes, plasma cutting nozzles, and high-performance thermal applications.
Oxygen Free Copper (OFC) with 99.97% purity represents one of the most refined grades of copper available for industrial manufacturing. Produced through specialized continuous casting and vacuum smelting processes, this material achieves an oxygen content below 0.001%, eliminating the risk of hydrogen embrittlement and oxidation-related failures. In the context of welding and plasma cutting, 99.97% OFC delivers unmatched electrical conductivity (reaching up to 101% IACS), exceptional thermal dissipation, and superior resistance to arc erosion — making it the material of choice for high-demand fabrication environments worldwide.
Even trace oxygen levels above 0.003% can cause micro-porosity in weld zones, reduce electrode lifespan by up to 40%, and compromise plasma arc stability. Kepai's 99.97% OFC ensures zero oxygen-induced defects, delivering consistent arc performance, longer nozzle service life, and cleaner cut edges — directly reducing operational downtime and rework costs in industrial fabrication lines.
Six critical performance attributes that make 99.97% OFC the benchmark material for welding and plasma cutting systems.
Electrical conductivity ≥101% IACS ensures minimal resistive losses in welding cables, electrode holders, and plasma torch bodies, enabling higher power transfer efficiency.
Thermal conductivity of ~391 W/(m·K) allows rapid heat dissipation from welding tips and plasma nozzles, preventing premature thermal fatigue and extending component life by 2–3×.
Sub-0.001% oxygen content eliminates the risk of hydrogen embrittlement during high-temperature processing, maintaining ductility and structural integrity under extreme welding conditions.
Consistent grain structure and high purity enable precise CNC machining of complex nozzle geometries, electrode profiles, and contact tips with tight dimensional tolerances (±0.01mm).
The refined microstructure of 99.97% OFC provides enhanced resistance to arc erosion and pitting, critical for plasma cutting nozzles operating at 20,000–30,000°C arc temperatures.
Fully compliant with RoHS, REACH, and international environmental standards. 100% recyclable without purity loss, supporting circular economy manufacturing models.
The oxygen free copper market for welding and plasma cutting is experiencing accelerated growth driven by automation, EV manufacturing, and renewable energy infrastructure.
The global oxygen free copper market reached USD 4.8 billion in 2024, with welding and cutting applications accounting for approximately 28% of total demand.
Industry analysts project a compound annual growth rate of 7.2% for OFC in industrial applications through 2030, driven by EV battery manufacturing, aerospace welding, and robotic plasma cutting lines.
Over 65% of new industrial welding installations in 2024 incorporated automated or robotic systems, requiring higher-purity OFC materials to meet continuous-duty cycle performance demands.
Demand for OFC in new energy vehicle battery welding and busbar applications has tripled since 2020, with projections indicating further 4× growth by 2028 as global EV production scales.
Independent testing demonstrates that 99.97% OFC plasma nozzles and welding electrodes achieve 40% longer service life compared to standard electrolytic copper, delivering measurable ROI.
Kepai's high-purity OFC products are exported to over 120 countries, with growing demand from North America, Europe, Southeast Asia, and the Middle East for precision welding applications.
From automotive assembly lines to aerospace fabrication, 99.97% OFC enables superior performance across the most demanding welding and cutting environments.
EV battery tab welding requires ultra-precise resistance spot welding with electrodes that maintain dimensional stability at high cycle rates. 99.97% OFC electrodes deliver consistent weld nugget formation, critical for battery cell integrity and safety certification in Tesla, BYD, and CATL production lines.
Aerospace-grade TIG and MIG welding of aluminum alloys, titanium, and stainless steel demands contamination-free copper contact tips and nozzle bodies. OFC's zero-porosity microstructure prevents cross-contamination that could compromise weld certification to AS9100 and NADCAP standards.
CNC plasma cutting systems operating at 100–400A require nozzle materials with extreme arc erosion resistance. 99.97% OFC nozzles maintain bore geometry 40% longer than standard copper, ensuring cut quality consistency on structural steel, stainless, and aluminum plate up to 150mm thick.
High-voltage transformer busbar welding and substation copper bus joint fabrication require OFC materials that maintain electrical continuity post-weld. 99.97% purity ensures joint conductivity matches base material, critical for grid reliability in renewable energy installations.
Relay contact welding in lithium battery management systems demands micro-precision resistance welding with OFC electrodes that deliver repeatable micro-weld energy. Kepai's OFC materials are qualified for use in leading BMS relay manufacturers across China and Europe.
Marine environment welding of hull structures, offshore platform components, and subsea pipelines requires copper welding consumables with enhanced corrosion resistance. OFC's high purity base provides superior corrosion resistance when alloyed with tin or nickel for marine-grade welding wire production.
5G base station antenna welding and semiconductor package bonding require sub-micron contamination control. 99.97% OFC's ultra-clean composition prevents ionic contamination that could degrade RF performance or cause semiconductor junction failures in high-frequency applications.
Fiber laser cutting systems operating at 6–20kW use copper nozzle bodies that must maintain precise gas flow geometry under intense thermal cycling. 99.97% OFC's thermal stability and machinability enable nozzle tolerances of ±0.005mm, critical for kerf quality in precision sheet metal fabrication.
Kepai's 99.97% Oxygen Free Copper meets and exceeds international standards including ASTM B170, GB/T 11087, and ISO 1337.
| Parameter | Specification | Standard |
|---|---|---|
| Copper Purity | ≥ 99.97% | ASTM B170 / GB/T 11087 |
| Oxygen Content | ≤ 0.001% (10 ppm) | ASTM B170 Grade 1 |
| Electrical Conductivity | ≥ 101% IACS | IEC 60468 |
| Thermal Conductivity | 391 W/(m·K) | ISO 22007 |
| Tensile Strength | 200–250 MPa (annealed) | ASTM E8 |
| Elongation | ≥ 40% | ASTM E8 |
| Hardness (HV) | 40–65 HV (depending on temper) | ISO 6507 |
| Available Forms | Rod, Bar, Tube, Strip, Wire, Custom Profile | Custom per order |
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. The products are mainly applied in high-tech fields such as new energy vehicles, 5G technology, laser cutting, and lithium battery relays.
Is Established
Factory Covers an Area
An Office Space
Four pillars that position Kepai as a leading supplier of oxygen free copper for welding and plasma cutting applications globally.
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.
State-of-the-art manufacturing and quality control equipment ensuring every batch of OFC meets the strictest purity and dimensional standards.
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
Internationally recognized certifications and quality management systems guaranteeing product compliance for global welding and plasma cutting markets.
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.
Explore Kepai's full lineup of precision copper alloy materials engineered for welding electrodes, plasma nozzles, laser cutting heads, and high-conductivity industrial components.
C17200 High Strength Beryllium Copper Alloy for Welding Electrodes
High Performance Beryllium Copper Alloy for Plasma Cutting
C17500 Beryllium Cobalt Copper for Plasma Nozzles
C11000 Pure Copper OFC Grade for Welding
C18150 Chromium-Zirconium Copper Alloy for Welding Tips
UNS C51900 Copper Alloy for Precision Cutting Components
Kepai Oxygen Free High Conductivity Tellurium Copper
C17510 Copper-Nickel-Beryllium Alloy for Plasma Electrodes
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!
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