C11000 ETP Copper: Electrolytic Tough Pitch — The Standard Electrical Grade
ASTM B152 · Published: 2026-06-03 · Updated: July 2026
C11000 Electrolytic Tough Pitch (ETP) copper is the most widely used copper grade — with 100% IACS minimum electrical conductivity, it is the standard material for electrical bus bars, wiring, transformer windings, and electrical connectors. It...
C11000 Electrolytic Tough Pitch (ETP) copper is the most widely used copper grade — with 100% IACS minimum electrical conductivity, it is the standard material for electrical bus bars, wiring, transformer windings, and electrical connectors. It contains a controlled oxygen content (~0.04%) for optimal conductivity.
Quick Facts
| Category | Copper Alloy |
| Standard | ASTM B152 |
| Density | 8.94 g/cm³ |
| Yield Strength | 69 MPa (annealed) |
| Tensile Strength | 220 MPa (annealed) |
Global Equivalents & Cross-Reference
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Frequently Asked Questions
Can ETP copper be welded?
ETP copper is not recommended for welding because the oxygen content can react with hydrogen at elevated temperature, causing steam embrittlement (hydrogen embrittlement). For welded applications, use oxygen-free copper (C10200) or phosphorus-deoxidized copper (C12200).
References & International Standards
- ASTM International. Standard Specifications for Steel & Metal Alloys. astm.org
- International Organization for Standardization (ISO). Metallic Materials — Cross-Reference Database. iso.org
- American Iron and Steel Institute (AISI). Steel Grade Designations & Equivalents. steel.org
- European Committee for Standardization (CEN). EN Steel Standards & Numbering System. cencenelec.eu