In high-precision electronics and vacuum technology, C10700 (Oxygen-Free Copper) is more than just a metal-it is a critical performance component. Known for its purity of ≥99.95% and a conductivity that can exceed 101% IACS, C10700 is the go-to material for environments where electrical resistance and thermal stress are non-negotiable.
This guide provides a professional deep dive into the properties, applications, and procurement standards of C10700 copper plates and rods.
1. Why C10700? The Technical Edge
C10700 is categorised under the Oxygen-Free (OF) copper group. Unlike standard ETP (Electrolytic Tough Pitch) copper, C10700 is refined in a vacuum or inert atmosphere, reducing its oxygen content to ≤0.0005%.
Key Performance Benefits:
Immunity to Hydrogen Embrittlement: Crucial for welding or brazing in hydrogen-rich atmospheres.
Extreme Conductivity: Offers lower energy loss compared to C11000.
Superior Ductility: Allows for intricate deep-drawing and cold-forming without cracking.
2. Technical Specifications: Chemical & Mechanical
Chemical Composition (ASTM B170 Compliance)
| Element | Content (%) | Impact on Performance |
| Copper (Cu + Ag) | ≥ 99.95% | Ensures maximum electron flow. |
| Oxygen (O) | ≤ 0.0005% | Prevents embrittlement during high-temp processing. |
| Phosphorus (P) | ≤ 0.0003% | Keeps conductivity at peak levels. |
| Total Impurities | ≤ 0.05% | Minimises lattice distortion. |
Mechanical Property Comparison (Soft vs. Hard Temper)
| Property | Soft (O) | Hard (H04) |
| Tensile Strength | 200 - 250 MPa | 300 - 350 MPa |
| Elongation (%) | ≥ 35% | ≥ 5% |
| Hardness (HV) | 40 - 60 | 80 - 110 |
3. Industrial Applications: Where C10700 Excels
C10700 is specifically chosen for high-end industrial and scientific equipment:
Vacuum Electronics: Anodes, cathodes, and vacuum seals for power tubes and magnetrons.
Power Distribution: High-conductivity busbars, winding wires for supercomputing cooling systems.
Scientific Research: Vacuum chambers for particle accelerators and superconducting magnet supports.
Semiconductors: Lead frames and high-purity sputtering targets.
4. Fabrication & Processing Notes for Engineers
Welding: Gas-shielded arc welding (TIG/MIG) is recommended. Avoid methods that introduce oxygen into the weld pool.
Machinability: C10700 has a machinability rating of approximately 20%. While it is "gummy" like most pure coppers, using sharp tools and the right lubricants ensures high-precision finishes.
Surface Treatment: To maintain its high emissivity and conductivity, C10700 copper plates can be supplied with Bright Annealed (BA), Matte, or Pickled finishes.
5. Procurement Strategy: Lead Times & Quality Assurance
At Baohui Steel, we understand that material traceability is vital for C10700.
Stock Dimensions:
Rods: Φ3mm to Φ150mm.
Plates: Thickness 0.5mm to 50mm.
Quality Control: Every batch undergoes Eddy Current Testing (ECT) and chemical analysis.
Global Fulfilment: Standard orders ship within 15–25 days with flexible MOQ options for R&D projects.
FAQ
What are the 4 types of copper?
In industrial manufacturing, copper is generally divided into four main groups:
Oxygen-Free Coppers (e.g., C10100, C10200, C10700): Best for vacuum and high-temp welding.
Electrolytic Tough Pitch (ETP) Coppers (e.g., C11000): The most common type for general electrical use.
Deoxidised Coppers (e.g., C12200): Standard for plumbing and HVAC tubes.
Copper Alloys: Brasses, bronzes, and speciality alloys (e.g., Beryllium Copper) for enhanced strength.
What is the composition of C10700?
C10700 consists of at least 99.95% Copper (including Silver). It is meticulously refined to keep Oxygen levels below 5 ppm (0.0005%), which distinguishes it from standard industrial coppers.
What is the difference between copper C101 and C110?
The main difference is Oxygen content and Purity.
C101 (OFE): 99.99% pure with almost zero oxygen. Used for the most demanding vacuum and cryogenic applications.
C110 (ETP): 99.90% pure but contains a small amount of oxygen (as cuprous oxide). It is cheaper but prone to hydrogen embrittlement if welded.
What material is C1100?
C1100 (often referred to as C11000 or ETP Copper) is the "workhorse" of the copper industry. It has high conductivity (min 100% IACS) and is used for busbars, terminals, and architectural cladding. However, it should not be used in high-temperature hydrogen environments due to the risk of cracking.
Choosing the Right Material for Your Project
Selecting the perfect grade of copper-whether it's C10700 copper plates for vacuum environments or C1100 for general electrical use-is a decision that impacts the longevity and efficiency of your engineering projects. At Baohui Steel, we don't just supply metal; we provide material solutions tailored to your specific technical requirements.
Need a customised quote or a technical consultation? Our team of experts is ready to assist you with material selection, precision processing, and global logistics.
Contact Our Engineers Today or email us at baohui@bhsteelpipe.com for a prompt response within 24 hours.
