Answer: In the world of metal stamping, electrical components, and precision manufacturing, two copper-based alloys dominate: Pure Copper (C11000) and Brass (C26000). While both offer excellent conductivity and formability, their differences in composition, mechanical properties, corrosion resistance, and cost make them suited for entirely different applications. This detailed guide compares C11000 (Electrolytic Tough Pitch Copper) and C26000 (Cartridge Brass) across 12 key categories—helping engineers, procurement teams, and manufacturers make informed material decisions

Brass vs. Pure Copper: A Comprehensive Comparison of C26000 and C11000 in Metal Stamping and Manufacturing 

1. Chemical Composition

Property	C11000 (Pure Copper)	C26000 (Cartridge Brass)
Primary Elements	99.90% Cu, 0.04% O (max)	68–71% Cu, 29–32% Zn
Alloying Elements	Trace phosphorus (optional)	None (binary Cu-Zn alloy)
Oxygen Content	0.02–0.04% (ETP grade)	Negligible
Impurity Limits	Fe ≤ 0.05%, Pb ≤ 0.005%	Fe ≤ 0.05%, Pb ≤ 0.07%

2. Electrical Conductivity (IACS %)

Material	Conductivity (% IACS)	Resistivity (µΩ·cm)
C11000	100%	1.69
C26000	28%	6.2

C11000 is the gold standard for electrical applications—used in busbars, connectors, and PCB substrates. C26000 sacrifices conductivity for strength and aesthetics—common in decorative hardware and low-current terminals.

3. Mechanical Properties (Annealed Condition)

Property	C11000	C26000
Tensile Strength (MPa)	220–280	300–370
Yield Strength (MPa)	70–140	100–320
Elongation (%)	45–55%	50–65%
Hardness (HRB)	40–60	55–75
Springback	High	Moderate

C26000 offers 30–40% higher strength and better springback control—ideal for deep drawing, stamping springs, and connectors. C11000 is softer and more ductile, perfect for bending, flanging, and cold heading.

4. Formability in Metal Stamping

Process	C11000	C26000
Blanking	Excellent	Excellent
Deep Drawing	Good (soft)	Superior (controlled springback)
Progressive Die	High ductility	Better edge quality
Fine Blanking	Possible	Preferred
Coining	Excellent flow	Good

5. Corrosion Resistance

Environment	C11000	C26000
Atmospheric	Good (forms patina)	Excellent (dezincification-resistant)
Marine/Salt Spray	Moderate	Better (Zn protects Cu)
Ammonia/Stresses	Prone to SCC	Highly resistant
Acids (dilute)	Poor	Moderate

C26000 resists season cracking and dezincification in humid or chemical environments. C11000 requires protective coatings in aggressive settings.

6. Thermal Conductivity

Material	W/m·K
C11000	398
C26000	120

C11000 excels in heat exchangers, radiators, and thermal management. C26000 is used where moderate heat transfer is acceptable.

7. Machinability & Weldability

Property	C11000	C26000
Machinability	Poor (gummy)	Excellent (free-cutting)
Soldering	Excellent	Excellent
Brazing	Excellent	Good
Welding (TIG/MIG)	Excellent	Fair (Zn vapor)

C26000 is preferred for machined-stamped hybrids (e.g., screw-machined terminals). C11000 is welded seamlessly in busbar assemblies.

8. Cost Comparison

Factor	C11000	C26000
Base Metal Price/lb	$4.20–$4.60	$3.10–$3.50
Alloy Premium	None	+15–20% over Cu
Scrap Value	High	Moderate
Total Landed Cost	Higher	15–25% lower

9. Common Applications

C11000 (Pure Copper)	C26000 (Cartridge Brass)
Busbars, grounding straps	Electrical connectors, terminals
Heat sinks, radiators	Battery caps, fuse clips
Roofing, architectural flashings	Decorative hardware, locks, hinges
PCB substrates, flexible circuits	Ammunition casings, musical instruments
RF shielding, EMI gaskets	Automotive trim, lamp parts

10. Sustainability & Recyclability

Both are 100% recyclable. C11000: Higher scrap value → stronger closed-loop incentives. C26000: Zinc volatility in melting requires controlled recycling.

2025 Trend: C26000 gaining in EV battery terminals due to cost + formability, despite lower conductivity.

11. Standards & Specifications

Standard	C11000	C26000
ASTM	B152, B187, B370	B36, B19
UNS	C11000	C26000
Temper	O (annealed), H (cold-worked)	H00 to H10
RoHS/REACH	Compliant	Compliant

12. Decision Matrix: When to Choose Which?

Requirement	Choose C11000	Choose C26000
Max electrical conductivity	✅
High strength & springback control		✅
Cost-sensitive, high volume		✅
Decorative/aesthetic finish		✅ (golden tone)
Deep drawing or fine blanking		✅
Welding or brazing critical	✅
Marine or chemical exposure		✅

Conclusion: Not Competitors—Complementary Materials

Pure Copper (C11000) and Brass (C26000) are not interchangeable—they serve distinct roles in modern manufacturing:

• Use C11000 when electrical performance, thermal transfer, or ductility is non-negotiable.
• Choose C26000 for cost-effective, high-strength, aesthetically pleasing stamped parts with moderate conductivity.

In 2025, with EV battery terminals, 5G connectors, and renewable energy hardware driving demand, hybrid designs often combine both: C11000 busbars with C26000 stamped terminals—optimizing performance and cost.

Sources

• ASTM International Standards (B152, B36)
• Copper Development Association (CDA)
• Metal Stamping Atlas Industry Report, 2025
• LME Copper & Zinc Pricing, November 2025