What Is the Difference Between C11000 and C10100 Copper?
For procurement professionals and engineers, understanding the difference between C11000 (Electrolytic Tough Pitch) and C10100 (Oxygen-Free Electronic) copper is essential for selecting the right material for critical applications. While both are high-purity copper grades, their differences in composition, properties, and applications are significant.
Composition and Purity
| Parameter | C11000 ETP | C10100 OFE |
|---|---|---|
| Copper Purity | 99.90% minimum | 99.99% minimum |
| Oxygen Content | 0.02-0.04% | <0.0005% (5 ppm max) |
| Other Impurities | Up to 0.10% total | <0.01% total |
Key Differences
Electrical Conductivity
C10100 OFE copper achieves up to 101% IACS conductivity, slightly higher than C11000’s 100% IACS minimum. For most applications, this difference is negligible, but for ultra-high-reliability electrical systems, every percentage point matters.
Ductility and Formability
Because oxygen-free copper lacks oxide inclusions, C10100 exhibits superior ductility and can withstand more severe forming operations without cracking. This makes it the preferred choice for deep drawing, thin foil rolling, and complex forming.
Outgassing and Vacuum Performance
C10100 contains essentially no oxygen, eliminating outgassing in vacuum environments. This is why oxygen-free copper is specified for semiconductor manufacturing equipment, particle accelerators, and vacuum systems. C11000’s oxygen content can cause issues in high-vacuum or hydrogen environments.
Weldability
C10100 offers superior weldability because oxygen-free material is less susceptible to hydrogen embrittlement during welding. C11000 can develop porosity and cracking in welded joints due to the reaction between oxygen and hydrogen (steam embrittlement).
Cost
C10100 OFE copper commands a significant premium — typically 20-50% higher than C11000. This price difference reflects the additional refining steps required to achieve 99.99% purity and strict quality control.
When to Choose Each Grade
Choose C10100 OFE when:
- Manufacturing semiconductor and electronic components
- Operating in high-vacuum environments
- Requiring the highest possible conductivity (cryogenic magnets, precision instruments)
- Performing critical welding operations
- Ultra-high reliability is mandatory
Choose C11000 ETP when:
- Standard electrical conductivity is sufficient
- Cost-effectiveness is a priority
- Applications are not in vacuum or hydrogen environments
- General construction, plumbing, roofing, or industrial use
- Large quantities are needed
Supply from Core Metal Steel
Core Metal Steel supplies both C11000 ETP and C10100 OFE copper in multiple product forms. Contact us for a quote and our technical team will help you select the optimal grade for your application.