Pure Copper vs. Oxygen-Free Copper

When it comes to selecting a metal that can conduct both heat and electricity efficiently, copper is the obvious choice. That's why it is considered the standard of electrical conductivity for other metals. In a home environment, copper is not as likely to corrode as it is in industrial settings, where factors such as oxidized acids, compounds of sulfur and ammonia, and oxidizing heavy-metal salts tend to speed up corrosion. This is why it's often used as the base metal for all the electrical and thermal products we use in our daily lives.

For industrial applications, it's important to protect against corrosion in more extreme environments-this is where oxygen-free copper can become an invaluable material. To help you make the right choice for your application, we discuss the differences between pure copper vs. oxygen-free copper and list the properties of each.

When a metal has a minimum copper content of 99.3%, it is known as commercially pure copper. However, such coppers are very soft and ductile in nature. That's why other alloying elements are often added to copper to optimize its properties for a wide range of usage. However, in terms of electrical conductivity, even 0.05% of arsenic impurity can decrease copper's conductivity by 15%. In this regard, oxygen-free copper offers mechanical strength coupled with high conductivity, all in one.

Oxygen-free copper (OFC) is copper that has gone through an electrolytic refinement process to remove all but a trace level of oxygen. It's the purest commercial copper grade available, containing 99.99% copper with a minimal amount of impurities, and is highly recommended for applications requiring superior conductivity and connectivity, such as superconducting wires, PCBs, X-ray tubes, vacuum interrupters, rotor bars, and motor coils.

Oxygen-free copper has:

A rich conductivity profile.

High immunity to hydrogen embrittlement.

Superior cryogenic properties.

Excellent malleability.

Oxygen-free copper is available in the following three grades:

C10100 (OFE): 99.99% pure copper with 0.0005% oxygen content

C10200 (OF): 99.95% pure copper with 0.001% oxygen content

C11000 (ETP): 99.9% pure copper with 0.02% to 0.04% oxygen content

Pure copper and OFC offer exceptional conductivity and high corrosion resistance, but they are difficult to machine as compared to oxygen-bearing coppers. Copper alloys with high purity levels are highly ductile. The chips stick to the tool during machining and are hard to remove; thus, the tool has to exhibit more force with each pass to get the job done. As a result, tool wear is also high.

To form needle-like, discontinuous chips while machining OFC, fabricators add chip-breaking elements such as lead, sulfur, and tellurium. However, these may reduce the electrical conductivity of the alloy if the elements are not used within certain specific requirements.

The machining properties of OFC are more or less similar to oxygen-bearing copper alloys with a homogeneous profile. Heterogenous copper alloys tend to have better machinability.

Founded in 2008, our company specializes in the international trade of high-quality copper products. We are dedicated to providing a comprehensive range of copper-based solutions to a global clientele.

Our core product portfolio encompasses a diverse spectrum of copper and copper alloy forms, including:

Copper Tubes & Pipes: Precision-engineered for applications in HVACR, plumbing, and industrial systems.
Copper Sheets & Plates: Available in various grades and thicknesses for roofing, fabrication, and architectural uses.
Copper Bars & Rods: Supplied as solid profiles, hexagons, or squares for machining, electrical components, and manufacturing.
Copper Wires & Strands: From fine enamelled wires to large conductive cables for electrical and winding applications.
Copper Foils & Strips: Thin-rolled products essential for electronics, transformers, RF shielding, and flexible circuits.

We also offer related products such as Copper Coils, Copper Profiles, Copper Blanks, Copper Busbars, Copper Fittings, Copper Alloys (including brass and bronze), Copper Anodes, and Copper Cathodes.

Email:sales@gneesteel.com