MetalsWhat is C11000 electrolytic copper and what is it used for? High conductivity
C11000 copper is high-conductivity electrolytic copper. In this guide we explain what C11000 electrolytic copper is, its composition, its properties, what it is used for and the sizes we stock.
What is electrolytic copper C11000?
C11000 (ETP) copper, a high-grade electrolytic copper, is a high-purity copper (99.90 % min) known for its excellent electrical and thermal conductivity. In H02 and H04 tempers it offers higher mechanical strength while retaining very high conductivity, making it ideal for bus bars, conductors, connections and electrical components.
Chemical composition of C11000 electrolytic copper
This is the typical composition of C11000 copper (UNS C11000 / ASTM/ASME B152 / B187 / EN CW004A / DIN 2.0060 / JIS C1100 standard):
| Element | Contents | What for? |
|---|---|---|
| Copper (Cu) | 99.90 % min. | Base metal |
| Oxygen (O) | 0.02 – 0.04 % | Refining oxygen (tough pitch copper) |
| Others | 0.06 % max. | Other elements, kept limited |
C11000 properties and temper
C11000 is nearly pure copper (99.90 % minimum), so its key strength is electrical and thermal conductivity, among the highest of all metals. Being pure copper, it does not harden by heat treatment: it gains strength through cold working. In the H02 and H04 tempers (half-hard and hard) its mechanical strength rises while retaining very high conductivity, ideal for busbars and conductors.
What is it for? Applications of C11000
C11000 copper is mainly used in:
- Busbars
- Electrical conductors and cables
- Connectors and terminals
- Conductive welding components
- Contacts and switching
- Heat exchangers
- Heat sinks
- Electrical hardware and accessories
- Electronic components
Forms and sizes we carry
At NAT MAC we stock C11000 electrolytic copper in these forms and sizes:
| Package size | Sizes |
|---|---|
| Plates | 1/8" – 1/4" (3.18 – 6.35 mm) |
| Round bars | 1/4" – 6" (6.35 – 152.4 mm) |
| Flat bars | 1/8" – 1-1/2" (3.18 – 38.1 mm) |
| Sheet | Cal 26 – Cal 14 (0.41 – 1.63 mm) |
If you need a particular size, tell us which one and we will gladly source it for you.
C11000 equivalents and standards
C11000 copper is also identified by these standards: UNS C11000 / ASTM/ASME B152 / B187 / EN CW004A / DIN 2.0060 / JIS C1100. You can see how to read them in our article on metal standards.
In summary
- C11000 (ETP) is high-purity electrolytic copper (99.90 % min)
- Its strength is electrical and thermal conductivity; work hardens by cold working (H02/H04)
- Ideal for bus bars, conductors, connections and heat sinks
- We carry it in plates, round bars, flat bars, sheet, cut to size
Why buy your C11000 copper at NAT MAC?
We have more than 54 years of experience as an industrial supplier and ISO 9001 certified quality. We carry copper and its alloys, and we help you choose the right grade for your application.
- Quality C11000 copper, fully backed and traceable
- Material cut to the size you need
- Advice on choosing the right copper for your conductivity and strength needs
- Electrolytic copper and high-performance alloys
- On-time deliveries and competitive prices
Tell us what you'll make and what you need (conductivity, strength or weldability), and we'll recommend the right copper and form. Request your free quote.
Sources: data sheet from our NAT MAC catalog (composition, sizes and applications) and public references from the copper industry. Values are for reference and may vary by standard, temper and heat.
