Copper Sheet Metal Fabrication: Conductive, Corrosion-Resistant Parts
Copper sheet metal fabrication: C11000 electrolytic copper (100% IACS conductivity), C12200 deoxidized copper, and C26000 cartridge brass. Laser cutting, CNC bending, brazing, and soldering. Excellent electrical and thermal conductivity.
Copper Sheet Metal Fabrication: Conductive, Corrosion-Resistant Parts
Copper sheet metal is the benchmark material for electrical and thermal applications. With 100% IACS electrical conductivity (the standard by which all conductors are measured) and 391 W/m·K thermal conductivity (twice that of aluminum, eight times that of steel), copper is essential for bus bars, heat sinks, electrical contacts, and heat exchangers. Copper also exhibits excellent corrosion resistance and antimicrobial properties.
At FIRMFG, we fabricate copper sheets from 0.3mm to 4mm thick across three grades: C11000 (highest conductivity), C12200 (best for welding), and C26000 cartridge brass (decorative + antimicrobial). Our capabilities include specialized fiber laser cutting for highly reflective copper, CNC bending with minimal springback, and silver brazing for conductive joints.
This guide covers copper grade selection, material properties, fabrication processes, design guidelines, surface finishing, and cost factors. Or, skip ahead and request a quote for an immediate price and lead time.
Copper Quick Specifications
Key specifications for copper sheet metal fabrication across all three grades.
| Specification | Value |
|---|---|
| Material Thickness | 0.3 – 4 mm |
| Dimensional Tolerance | ±0.1 mm |
| Electrical Conductivity | 100% IACS (C11000) |
| Thermal Conductivity | 391 W/m·K (C11000) |
| Density | 8.96 g/cm³ (C11000) |
| Max Sheet Size | 1000 × 2000 mm |
Copper Grades for Sheet Metal
Three grades cover virtually all copper sheet metal applications. Grade selection depends on the required conductivity, weldability, and appearance.
C11000 (Electrolytic Copper)
Highest Conductivity
Pure copper (99.9% Cu) with the highest electrical and thermal conductivity of all copper alloys. Excellent formability and corrosion resistance. The standard grade for electrical and thermal applications.
Properties: Conductivity: 100% IACS | Tensile: 220 MPa | Density: 8.96 g/cm³
Best for: Electrical bus bars, heat sinks, grounding, heat exchangers
C12200 (Deoxidized Copper)
Best for Welding
Phosphorus-deoxidized copper with excellent weldability and brazeability. Slightly lower conductivity (85% IACS) but superior to C11000 for welding applications. Used for plumbing and heat exchanger tubes.
Properties: Conductivity: 85% IACS | Tensile: 220 MPa | Density: 8.94 g/cm³
Best for: Welded components, plumbing, heat exchanger tubes
C26000 (Cartridge Brass)
Best for Decorative & Forming
70/30 copper-zinc alloy with golden appearance, excellent formability, and good corrosion resistance. Known as "cartridge brass" for its deep drawing capability. Antimicrobial properties.
Properties: Conductivity: 28% IACS | Tensile: 380 MPa | Density: 8.53 g/cm³
Best for: Decorative parts, deep-drawn shapes, electrical terminals, antimicrobial surfaces
Material Properties Comparison
Side-by-side comparison of C11000, C12200, and C26000 properties for material selection.
| Property | C11000 | C12200 | C26000 | Note |
|---|---|---|---|---|
| Density | 8.96 g/cm³ | 8.94 g/cm³ | 8.53 g/cm³ | Denser than steel (7.85) |
| Electrical Conductivity | 100% IACS | 85% IACS | 28% IACS | IACS = International Annealed Copper Standard |
| Thermal Conductivity | 391 W/m·K | 340 W/m·K | 121 W/m·K | 2× of aluminum, 8× of steel |
| Tensile Strength | 220 MPa | 220 MPa | 380 MPa | Brass is stronger |
| Elongation | 45% | 45% | 55% | Excellent formability |
| Corrosion Resistance | Excellent | Excellent | Very Good | Natural patina protects |
| Formability | Excellent | Excellent | Excellent | Best of all metals |
| Antimicrobial | Yes (rapid kill) | Yes | Yes (strong) | EPA-registered antimicrobial |
C11000 offers the highest conductivity. C12200 is best for welded components. C26000 brass offers higher strength and golden appearance at lower cost.
Fabrication Processes for Copper
Copper is one of the easiest metals to fabricate due to its excellent ductility and formability. Specialized equipment is needed for laser cutting due to reflectivity.
Laser Cutting
Fiber laser cutting with nitrogen assist. Copper reflects IR, requiring specialized high-power fiber laser. Clean edges, no burr.
CNC Bending
Press brake bending with minimal springback (0.5–1.5°). Copper is extremely ductile and forms easily with small radii.
Brazing & Soldering
Silver brazing and soldering for electrical joints and sealed assemblies. Strong, conductive joints without base metal melting.
Stamping
Progressive die stamping for high-volume copper terminals, connectors, and contacts. Excellent formability enables complex shapes.
Design Guidelines for Copper
Copper is the most formable of all sheet metals. Follow these DFM rules to optimize parts for conductivity, corrosion resistance, and cost.
| Feature | Recommended | Minimum |
|---|---|---|
| Min Bend Radius | 0.5× thickness | 0.3× thickness (excellent formability) |
| Hole-to-Bend Distance | 2× thickness + bend radius | 1.5× thickness + bend radius |
| Min Flange Width | 3× thickness + bend radius | 2× thickness + bend radius |
| Avoid Stress Corrosion | Avoid ammonia environments for C26000 brass | Apply protective coating for ammonia exposure |
| Oxidation Prevention | Apply clear coat or plating for appearance | Passivation for corrosion protection |
| Brazing Joint Design | 0.05–0.15mm clearance for capillary flow | Lap joint with minimum 3× thickness overlap |
| Thermal Expansion | Account for 17×10⁻⁶/°C expansion in assemblies | Allow expansion in dissimilar metal joints |
| Max Part Dimensions | 1000 × 2000 mm | 1200 × 2500 mm (extended bed) |
DFM Tips for Copper
- Copper bends easily — use 0.5× thickness bend radius (smallest of all metals).
- Apply clear coat or tin plating to prevent oxidation on visible surfaces.
- Design brazing joints with 0.05–0.15mm clearance for optimal capillary flow.
- Avoid using C26000 brass in ammonia environments — it causes stress corrosion cracking.
- Account for thermal expansion (17×10⁻⁶/°C) when designing dissimilar metal assemblies.
- Recover copper scrap — it has the highest recyclable value of all common metals.
Surface Finishing for Copper
Copper forms a natural protective patina, but surface treatments can preserve appearance and enhance functionality.
| Finishing | Suitable Grades | Notes |
|---|---|---|
| Clear Coat (Anti-Oxidation) | All copper grades | Prevents tarnish and oxidation; preserves original color |
| Passivation | C11000, C12200 | Removes surface contaminants, enhances natural patina formation |
| Tin Plating | All copper grades | Electrical contact enhancement; prevents oxidation; solderable |
| Nickel Plating | All copper grades | Decorative + corrosion resistance; harder than copper |
| Silver Plating | C11000 | Highest conductivity plating for RF and electrical contacts |
| Polishing | All copper grades | Mirror finish for decorative applications |
What Drives Copper Cost?
Copper is 4–6× more expensive than steel. However, high scrap value and easy processing partially offset the material cost premium.
Copper Price High & Volatile
Copper raw material is 4–6× more expensive than steel. Price fluctuates with LME (London Metal Exchange) copper futures. Quotes are valid for 7 days.
Processing Cost Moderate
Copper is soft and easy to cut, bend, and form — processing cost is similar to aluminum. However, laser cutting requires specialized high-power fiber laser.
Scrap Value High
Copper scrap has the highest recyclable value of all common metals, offsetting 50–70% of material cost for high-scrap parts.
C26000 Brass More Stable
Brass (C26000) costs 20–30% less than pure copper and has more stable pricing, plus higher strength and golden appearance.
Cost by Grade and Thickness
| Grade | Thickness | Sheet Price | Fabrication | Note |
|---|---|---|---|---|
| C11000 (Electrolytic) | 1.0mm | $45 – $65 /m² | $8 – $20 /part | Highest conductivity |
| C11000 (Electrolytic) | 3.0mm | $120 – $180 /m² | $15 – $35 /part | Bus bars, heat sinks |
| C12200 (Deoxidized) | 1.0mm | $40 – $55 /m² | $8 – $18 /part | Welded components |
| C12200 (Deoxidized) | 3.0mm | $110 – $160 /m² | $12 – $30 /part | Heat exchangers |
| C26000 (Cartridge Brass) | 1.0mm | $32 – $45 /m² | $6 – $15 /part | Decorative + forming |
| C26000 (Cartridge Brass) | 3.0mm | $85 – $120 /m² | $10 – $25 /part | Terminals, hardware |
Copper prices fluctuate with LME (London Metal Exchange) futures. Quotes are valid for 7 days. Scrap credit can offset 50–70% of material cost for high-scrap parts.
Copper Sheet Metal FAQ
Answers to the most common questions about copper sheet metal fabrication at FIRMFG.
QWhat is the electrical conductivity of copper sheet metal?
C11000 electrolytic copper has 100% IACS (International Annealed Copper Standard) conductivity — the benchmark by which all other conductors are measured. This means 5.96 × 10⁷ S/m. C12200 deoxidized copper has 85% IACS due to phosphorus content. C26000 cartridge brass has 28% IACS. For comparison, aluminum 6061 has 43% IACS and steel has only 7% IACS. Copper is the second-best conductor after silver (105% IACS) but is far more cost-effective.
QCan copper be brazed or soldered?
Yes, copper is one of the easiest metals to braze and solder. Silver brazing (brazing with silver-based filler at 600–800°C) produces strong, conductive joints without melting the base metal. Soldering (tin-lead or lead-free at 180–250°C) is used for electrical connections and plumbing. For best results: (1) Clean the joint thoroughly — copper oxide must be removed with flux. (2) Design joints with 0.05–0.15mm clearance for capillary action. (3) Use lap joints with minimum 3× thickness overlap. C11000 and C12200 braze excellently; C26000 brass also brazes well but may dezincify at high temperatures.
QHow do you prevent copper from oxidizing?
Copper naturally forms a protective patina (copper oxide → copper carbonate) that slows further corrosion but changes the surface color from bright orange to brown to green. To preserve the original appearance: (1) Clear coat — acrylic or polyurethane clear coat prevents oxidation and maintains shine. (2) Tin plating — provides a solderable, oxidation-resistant surface for electrical contacts. (3) Nickel plating — harder, more durable protection with silver appearance. (4) Passivation — removes surface contaminants and stabilizes the oxide layer. For electrical applications, tin plating is the standard choice as it prevents oxidation while maintaining solderability.
QWhat is the minimum thickness for copper sheet metal?
We can fabricate copper sheets as thin as 0.3mm. Copper is extremely ductile and can be bent, stamped, and deep-drawn even at very thin gauges. Common thicknesses in stock: 0.3, 0.5, 0.8, 1.0, 1.5, 2.0, 2.5, 3.0, 4.0mm. For thicknesses below 0.3mm, copper foil is used (typically adhesive-backed for EMI shielding applications). The maximum thickness for laser cutting is 4mm; for bending, 4mm; for stamping, 3mm.
QHow much does copper sheet metal fabrication cost?
Copper fabrication costs 4–6× more than equivalent steel parts due to the high raw material cost. C11000 electrolytic copper is the most expensive grade at $45–$180/m² depending on thickness. C12200 is 10–15% cheaper. C26000 brass costs 20–30% less than pure copper and offers higher strength. However, copper scrap has the highest recyclable value of all common metals — 50–70% of material cost can be recovered for high-scrap parts. Processing costs are moderate, similar to aluminum, as copper is soft and easy to form.
QWhat is the lead time for copper fabrication?
Standard lead time is 3–5 business days for simple parts in small batches. Complex parts with brazing or multiple bends take 5–7 days. For batches of 50+ parts, lead time extends to 7–10 days. C11000, C12200, and C26000 in standard thicknesses (0.3–4mm) are in stock. Surface finishing (tin plating, nickel plating, clear coat) adds 3–5 days. Rush service (2-day turnaround) is available for simple laser-cut parts without bending.
Applications of Copper Sheet Metal
Copper is used wherever electrical conductivity, thermal conductivity, or antimicrobial properties are required.
Electrical Connections
Bus bars, terminals, connectors, grounding plates
Heat Sinks
CPU coolers, power electronics, LED cooling
Grounding Parts
Grounding straps, EMI shielding, electrical contacts
Decorative Parts
Architectural trim, signage, artistic elements
Heat Exchangers
Radiators, evaporators, condensers, cooling coils
Antimicrobial Surfaces
Medical hardware, touch surfaces, food equipment
Related Sheet Metal Services
Explore our other sheet metal fabrication capabilities.
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Complete sheet metal fabrication including laser cutting, bending, welding, stamping, and surface finishing.
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Learn MoreAluminum Sheet Metal
5052, 6061, and 7075 aluminum fabrication. Lightweight alternative to copper for non-critical conductivity.
Learn MoreStart Your Copper Project
Upload your CAD files and get a free copper fabrication quote within 24 hours. Our engineers provide grade selection advice (C11000/C12200/C26000), brazing joint design, and conductivity optimization at no cost. 3-day turnaround.