Copper C101 vs C110 – What’s the Difference

Copper C101 vs C110

Copper has been an indispensable metal around the world for thousands of years. Its excellent electrical and thermal conductivity, malleability, and corrosion resistance have made it a suitable material for various applications. Copper is used extensively in electrical wiring, plumbing, and industrial applications. Though all copper types have similar properties, there are some differences between them that you should know. This article discusses the difference between the most common copper types – Copper C101 and C110.

What is Copper C101?

Copper C101 is a copper alloy of 99.9% pure electrolytic copper and 0.04-0.04% phosphorus. It has high electrical conductivity, excellent corrosion and oxidation resistance, good formability and ductility, superior strength at elevated temperatures and low magnetic permeability properties, making it perfect for applications such as electrical components, connectors, switches, motors and generator parts. Additionally, it offers excellent weldability without needing heat treatment or a controlled atmosphere.

What is Copper C110?

Copper C110 (UNS C11000 or Electrolytic Tough Pitch Copper) is a high copper-containing alloy with exceptional electrical and thermal conductivity. It contains 99.9% copper plus a small amount of oxygen, making it the most pure commercial copper available today. This alloy has great corrosion resistance due to its easy machinability and highly ductile nature. It also has excellent electrical properties, which make it ideal for use in several applications such as electrical engineering, marine vessels, chemical processing plants, aerospace components and many more areas where efficient power transfer is essential.

Difference Between Copper C101 and C110

Copper C101 and C110 are pure copper grades with a minimum content of 99.9% copper. The only difference between the two is the oxygen content. Copper C101 has a higher oxygen content than C110, with 0.04% of oxygen in C101 and 0.02% in C110. This difference might seem insignificant, but it significantly impacts the manufacturing and performance of these two copper grades.

Copper C101 is also known as Oxygen-Free Electronic (OFE) copper, while copper C110 is sometimes called Electrolytic-Tough-Pitch (ETP) copper. The higher oxygen content in C101 makes it a more suitable metal for electrical and electronic applications due to its higher conductivity. The purity of oxygen-free copper, coupled with its low electrical resistivity, ensures that electrical signals or impulses are transmitted over long distances without attenuation significantly.

Electrical Conductivity

Copper C110, on the other hand, has a lower electrical conductivity than C101, making it less suitable for electronic applications. However, it’s more malleable than C101, making it an ideal material for processing into thin sheets and wires. It’s often used in various applications, including heat exchangers, plumbing, and roofing materials.

Thermal Conductivity

Both copper C101 and C110 have excellent thermal conductivity, making them ideal heat transfer and piping materials in air conditioning and heating systems. They’re also corrosion-resistant and have antibacterial properties, making them ideal materials for water supply systems.


Because of copper C101’s higher purity, it’s more expensive than copper C110. That being said, the application and the performance required of the copper will dictate which one to select. In electronic or electrical applications where high conductivity is required, copper C101 is your best bet. For plumbing systems, roofing materials, and general use, copper C110 will do just fine.


Copper is a versatile metal with a wide range of applications, but it’s important to understand the differences between the different copper grades. Though Copper C101 and C110 are both pure copper grades, their difference in oxygen content has a significant impact on their applications. Copper C101 has a higher oxygen content, making it more suitable for electronic and electrical applications due to its higher conductivity. Copper C110 has a lower electrical conductivity than Copper C101, making it more malleable and ideal for processing into thin sheets and wires. As a result, selecting the appropriate copper type for your application is crucial; hopefully, this article has helped you make a more informed decision.



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