An in-depth analysis of the structural properties, manufacturing standards, and metallurgical advantages of high-purity (OFC/OFHC) capillary tubes in ultra-high precision industries.
In the fields of modern electronics, cryogenics, and analytical sciences, the physical integrity of conductive tubing cannot be compromised. Oxygen-Free High Conductivity (OFHC) copper, designated under ASTM standards as C10100 (99.99% purity) and C10200 (99.95% purity), represents the pinnacle of pure metal metallurgical processing. Unlike conventional electrolytic tough pitch (ETP) copper (such as C11000), which contains residual copper oxides, OFC is refined in a strict oxygen-controlled environment.
When drawn into capillary dimensions (typically defined as tubes with inside diameters measuring under 2.0 mm down to as small as 0.1 mm), oxygen-free copper displays unparalleled characteristics. The complete absence of oxides prevents the occurrence of hydrogen embrittlement during heat treatment or welding, maintaining structural resilience under high vacuum and extreme cryogenic conditions.
Furthermore, because impurity levels are kept under extremely low margins, the electrical conductivity is guaranteed to meet or exceed 101% IACS (International Annealed Copper Standard), and thermal conductivity remains exceptionally stable across temperatures ranging from absolute zero to several hundred degrees Celsius.
| Parameters & Grades | C10100 (OFE) | C10200 (OF) | C11000 (ETP) |
|---|---|---|---|
| Purity (Minimum Cu) | 99.99% | 99.95% | 99.90% |
| Residual Oxygen Content | < 5 ppm (0.0005%) | < 10 ppm (0.001%) | 100 - 600 ppm |
| Electrical Conductivity | 101% - 102% IACS | 100% - 101% IACS | 100% IACS |
| Hydrogen Embrittlement | Immune | Immune | Highly Susceptible |
| Typical Applications | UHV, Cryogenics, Semi-con | Precision Electronics, HVAC | Busbars, Wiring, General |
Investigating the current market forces driving precision OFC demand and the exact localized environments where capillary tubing plays a mission-critical role.
With the global push toward high-frequency transmission in 5G base stations, fiber-optic transceiver systems, and satellite communication components, power dissipation has become a major roadblock. Capillary oxygen-free copper tubes function as high-performance micro-heat pipes, vapor chambers, and phase-change cooling devices directly embedded in power amplifiers and semiconductor chipsets. The high thermal conductivity ensures instant heat dispersion, preventing thermal throttling.
In medical fields, analytical instruments like Gas Chromatography (GC), High-Performance Liquid Chromatography (HPLC), and mass spectrometers rely on micro-bore OFHC capillary tubes to transport minuscule liquid or gaseous samples without cross-contamination. In magnetic resonance imaging (MRI) machines, superconducting magnets require constant cooling using liquid helium lines. OFC capillary tubes provide the precise conduit for cryogen distribution under extremely low temperatures without fracturing.
New energy vehicles (EVs) utilize massive arrays of lithium battery cells that require advanced heat-dissipation techniques. Micro-capillary systems containing cooling fluids cycle through battery packs to maintain optimal temperature zones. In aerospace, these copper capillaries act as pressure measurement conduits and fuel injector guide lines, where failure to tolerate vibration or pressure spikes translates to mission failure. Low impurity copper ensures high-fatigue life and resistance to thermal shock.
A pioneering, high-tech enterprise integrating R&D, advanced casting, precision drawing, and rigorous quality control for high-end copper alloy systems.
Established in 2017, Sichuan Kepai New Material Co., Ltd. is a state-of-the-art Chinese high-tech manufacturer specializing in advanced copper alloys. The enterprise integrates the entire lifecycle of material engineering—from basic scientific research and alloy formulation to automated smelting, extrusion, precise capillary cold-drawing, and final validation.
Conveniently located in the western area of the Sichuan Guanghan Industrial Development Zone, adjacent to National Highway 108, our logistics networks link directly to major global shipping ports, ensuring efficient transit to North America, Europe, and Southeast Asia. Since our inception, Kepai has operated on the core philosophy: "Innovation-driven development, quality wins the market." We are committed to providing first-class strategic new materials aligned with global industrial standards.
Our state-of-the-art facility encompasses approximately 9,000 square meters of manufacturing space and 1,000 square meters of dedicated R&D and office areas. We focus on strategic, high-conductivity, high-strength special copper alloys—such as tellurium copper, silver copper, dispersion copper, and oxygen-free copper, heavily utilized in high-tech fields including electric vehicles, 5G communications, microelectronics, and aerospace engineering.
Unlocking the pillars of Sichuan Kepai’s market leadership and technical capabilities in advanced metallurgical processing.
Our research and development team is comprised of senior metallurgical experts, material scientists, and process engineers who continuously push the physical boundaries of copper alloys. Through independent R&D and close collaboration with prominent research universities, Kepai has achieved breakthrough patents in manufacturing high-performance tellurium copper, lead copper, and sulfur copper alloys. Many of our technological milestones have reached international benchmarks, offering excellent electrical performance and precision machining efficiency.
Kepai’s product line ranges from raw high-purity billets to customized precision capillary profiles. Our focus remains on high-end, high-performance copper products: pure copper, oxygen-free copper, oxygen-free high-conductivity tellurium copper, nickel-tellurium-copper, tin bronze, beryllium copper, lead bronze, and chromium-zirconium-copper. These engineered materials play a key role in reducing downstream manufacturing costs while improving terminal product lifespan and reliability.
Adhering to the strategy of "Rooted in Sichuan, radiating nationwide, and moving towards the world," Kepai has established a robust sales network across China and long-term strategic relationships with leading enterprises globally. We export our precision copper alloys to major industrial hubs worldwide, participating actively in international competition and continuously enhancing the global reputation of China's advanced manufacturing capabilities.
Analyzing the supply chain factors that enable Kepai to deliver high-quality, cost-efficient copper solutions to global engineering and procurement departments.
Global procurement of micro-bore capillary tubing involves more than simply finding a low-cost supplier. Engineers and procurement officers must carefully evaluate raw material quality, dimensional consistency, manufacturing capacity, and supply chain reliability. Sichuan Kepai offers key advantages that bridge the gap between quality and economic feasibility:
As the electronic components industry transitions toward smaller form factors, the demand for capillary tubes with thinner walls and smaller diameters is growing rapidly. Micro-machined electronics, ultra-precise medical probes, and modern aerospace instrumentation are pushing the limits of physical dimensions.
Kepai is investing in advanced cold-drawing technology to manufacture capillary tubes with wall thicknesses under 0.1 mm, while preserving structural strength. Simultaneously, we are researching smart manufacturing technologies to monitor metallurgical grain growth in real-time, ensuring uniform crystallization and high mechanical reliability.
A look at our advanced manufacturing lines and laboratory equipment, ensuring high-quality material consistency from melting to final packaging.
Smelting Furnace Line
Laying-off Station
Extrusion Pressing
Precision Drawing Machine
Straightening Equipment
Protective Packaging Line
Eddy Current Conductance Tester
Chemical Composition Testing Room
Metallographic Polishing System
Electro-Hydraulic Universal Tester
Electronic Universal Testing Machine
Digital Hardness Tester
Sichuan Kepai operates in strict accordance with international standards, backed by ISO certifications and rigorous export quality credentials.
Key technical insights regarding oxygen-free copper standards, capillary tolerances, processing capabilities, and customization options.
Sichuan Kepai New Materials Co., Ltd. will continue to focus on the research, development, and application of advanced materials, contributing to the growth of the copper alloy industry in China and globally. We look forward to partnering with customers worldwide to build a successful future together.
Kepai
