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Zhejiang Jingliang Copper-Tube Products Co., Ltd

Wholesale Oxygen-Free (OFC) Copper

Oxygen-Free (OFC) Copper

-- Steady & Reliable Manufacturer --

The Material of Choice for Vacuum and Audio Integrity

Oxygen-Free Copper (OFC), specifically the C10200 grade, is a high-conductivity copper that has been refined in a "Reducing Atmosphere" to eliminate the presence of cuprous oxides. At Zhejiang Jingliang, our OFC is produced with a maximum oxygen content of less than 10 ppm (parts per million). Why is this important? In standard ETP copper, oxygen reacts with hydrogen at high temperatures (like during brazing or welding) to form steam, which creates microscopic bubbles and cracks—a phenomenon known as "Hydrogen Embrittlement." By removing the oxygen, we create a material that is immune to this failure, making it the essential choice for "High-Integrity Joining" in vacuum tubes, power electronics, and aerospace components.

Our OFC production process involves "Continuous Casting" in a graphite-protected environment. This results in a material with a "Superior Surface Finish" and extremely high ductility. Beyond its industrial uses, OFC is the legendary standard for the "High-End Audio" industry. The absence of oxides means there are fewer "Grain Boundary" interruptions for the electrical signal to navigate, resulting in a cleaner, more accurate sound reproduction. Whether you are building "Hermetic Seals" for space-grade electronics or "Cryogenic Piping" for laboratory research, Jingliang's Oxygen-Free Copper provides the "Consistent Purity" and "Structural Reliability" that only oxygen-free metallurgy can provide.

OFC Metallurgical & Vacuum Specs

PropertyC10200 (OFC) Specification
Copper Content≥ 99.95% (Silver counted as copper)
Oxygen Content≤ 10 ppm (0.001%)
Electrical Conductivity≥ 101% IACS
Hydrogen EmbrittlementResistant (Passes ASTM B577)
Thermal Conductivity391 W/(m·K)
Ductility (Elongation)≥ 40% (Annealed)
Form AvailabilityTube, Wire, Strip, Rod, Sheet
StandardASTM B170 Grade 2 / DIN 1787
Surface RoughnessRa ≤ 0.4 μm (Draw dependent)
Application ClassVacuum / Electronic / Audio

Power Electronics, Vacuum Seals, and Audiophile Systems

OFC is the primary material for "High-Power Vacuum Electronics," including magnetrons, X-ray tubes, and klystrons, where hermetic glass-to-metal seals are required. In "Power Transmission," it is used for high-voltage busbars and "Superconducting Cable Bases." The "High-End Audio Industry" uses OFC for speaker wires, interconnects, and internal transformer windings to prevent signal degradation. It is essential in "Cryogenic Engineering" for cold fingers and thermal straps because it maintains high thermal conductivity at low temperatures. "Semiconductor Equipment" manufacturers use it for vacuum chambers and gas delivery lines. It is also found in "Aerospace Solar Panels" and "Satellite Antennas" where weight, conductivity, and vacuum stability are critical. Additionally, it is used for "Induction Melting Coils" and "Electronic Lead Frames" where high-temperature brazing is necessary during assembly.

No Embrittlement and Superior Signal Fidelity

The primary advantage is "Immunity to Hydrogen Embrittlement," allowing for "High-Temperature Brazing and Welding" in hydrogen atmospheres without any risk of internal cracking. Our OFC offers "Higher Electrical Conductivity" (101% IACS) than standard copper, which "Increases Energy Efficiency" in power systems. For the audio industry, it provides "Superior Signal Clarity," as the lack of internal oxides "Reduces Noise and Distortion" in high-frequency transmissions. The "High Ductility" of the alloy makes it "Easy to Draw into Fine Wires" or complex profiles without work-hardening too quickly. Our "Vacuum-Grade Cleanliness" ensures that the material does not "Outgas" in high-vacuum environments, "Maintaining System Pressure" in space and lab applications. Furthermore, the "Excellent Thermal Diffusivity" makes it the best choice for "High-Performance Heat Sinks." Finally, the "Improved Fatigue Life" of OFC ensures that components subjected to thermal cycling last significantly longer than those made from standard copper.

Oxidation-Free Packaging and High-Spec Logistics

Oxygen-free copper must be protected from the air. We ship our OFC in "Vacuum-Sealed VCI Bags" with moisture absorbers to ensure it arrives with a "Mill-Bright" finish. Payment is 30% T/T and 70% L/C. We ship via Ningbo/Shanghai, providing "Brazing Test Results" and "Oxygen Content Verification" reports. For the audio and electronic sectors, we offer "Custom Coil Sizes" and "Surface Passivation" to ensure the copper remains pristine even after the package is opened in your facility.

  • Q: Can I use regular copper instead of OFC for vacuum seals?
  • A: No. Regular copper contains oxygen that will cause the seal to fail during the heating process required to bond the metal to glass or ceramic.
  • Q: Why is OFC better for speaker cables?
  • A: The absence of cuprous oxides reduces the "Diode Effect" at grain boundaries, which enthusiasts believe results in a more natural and transparent sound.
ABOUT US
30+YEARS OF
EXPERIENCE
About Us

A Reliable Partner of the Copper Tube Industry

Zhejiang Jingliang Copper-Tube Products Co., Ltd is China Oxygen-Free (OFC) Copper and Oxygen-Free (OFC) Copper Factory, which established in 1994, has been deeply involved in the copper tube industry for over three decades. The company primarily produce various specifications of products such as copper tubes, brass tubes, copper square tubes, fin copper tubes, copper capillary tubes, condenser copper tubes, copper evaporator tubes, and conductive rods, which are of quality and have earned the trust and acclaim of customers both domestically and internationally.

Wide Applications:

These products are widely used in various fields including air conditioning, refrigeration, heat exchange, sanitary ware, automotive, machinery, electric furnaces, and chemical industries.

Convenient Transportation:

Strategically located in Tangpu Town, renowned as the “home of copper tubes” in East China. Our company enjoys a prime location, adjacent to the Shangsan Expressway and National Highway 104, and is conveniently situated just over 70 kilometers from Hangzhou and Ningbo, ensuring easy accessibility and a business position.

Strong Financial Resources:

With its strong financial resources and advanced copper tube processing technology, our company holds an advantageous position in market share, brand value, technological content, and product quality, becoming a preferred supplier for many listed groups.

Large Scale Production:

The company occupies an area of over 20,000 square meters, with a construction area of 12,800 square meters. In 2022, our annual production exceeded 7,500 tons, with a value output of up to 450 million yuan, demonstrating our strong production capacity and market competitiveness.

Comprehensive Industry Chain:

Jingliang has now developed into a complete industrial chain integrating smelting, extrusion, drawing, precision rolling, and annealing. It has been awarded multiple honors, including "Top Ten Copper Tube Enterprises" and "Leading Taxpayer in the Copper Tube Industry".

Smart Manufacturing:

Jingliang Copper-Tube Products will better integrate the concept of factory construction into its corporate development strategy, insist on refining technology and polishing products more finely, and the future of "intelligent manufacturing".

Genuine Cooperation:

Zhejiang Jingliang Copper-Tube Products Co.,Ltd warmly welcomes friends from all walks of life to visit and offer guidance. We look forward to joining hands with you to create a brilliant future together.

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