Copper Alloy C28000 vs C47940
Copper Alloy · grade comparison
Copper Alloy C28000 and C47940 are both copper alloy grades. C47940 is the stronger of the two: yield strength 180 MPa (26.1 ksi) against 145 MPa (21 ksi) for C28000, about 24% more; tensile strength follows at 415 MPa (60.2 ksi) vs 372 MPa (54 ksi). In exchange, C28000 is the more ductile: elongation 45% versus 38% for C47940, and C47940 is harder (105 HB vs 75 HB). On the shop floor, C28000 welds better (fair vs poor) and C28000 sits in a lower cost tier (premium, $$$) than C47940 (high, $$$$).
C28000Choose it when the part is bent, formed or impact-loaded, or when it will be welded.
C47940Choose it when strength drives the design.
C28000 vs C47940: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all copper alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all copper alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Elastic (Young's) Modulus
Shear Modulus
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Vickers
Same in both: Bulk Modulus 112 GPa16.2 Msi · Poisson's Ratio 0.34
Physical
Density and transition temperatures.
Density
Melting Point (Solidus)
Liquidus Temperature
Thermal
How each material carries heat and how hot it can run.
Thermal Conductivity
Specific Heat Capacity
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Min Service Temperature
Same in both: Max Service Temperature (continuous) 200°C392 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Corrosion Resistance
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Same in both: Machinability 55 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Embodied Water
Typical Recycled Content
Common Calculations
Ratios derived from the values above.
Specific Strength (UTS / density)
Specific Stiffness (E / density)
Modulus of Resilience
Thermal Diffusivity
Thermal Shock Resistance Index
Strength versus weight
Yield strength against density for every copper alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
Manufacturing and finishing
| Capability | C28000 | C47940 |
|---|---|---|
| CNC machining | Yes | — |
| Sheet metal | Yes | — |
| Default condition | O | — |
| Relative cost | $$$ Premium | $$$$ High |
| Min. machined wall | 0.8 mm | — |
| Best machined surface | Ra 1.6 µm | — |
| Chrome Plating | Yes | — |
| Electropolishing | Yes | — |
| Nickel Plating | Yes | — |
| Painting | Yes | — |
| Tin Plating | Yes | — |
They share 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C28000 vs C47940 — frequently asked
Is C47940 stronger than C28000?
Yes. C47940 has a typical yield strength of 180 MPa (26.1 ksi) against 145 MPa (21 ksi) for C28000 — about 24% more. Tensile strength is 415 MPa (60.2 ksi) vs 372 MPa (54 ksi).
Which is cheaper, C28000 or C47940?
C28000 is the lower-cost material: it sits in the premium tier ($$$) while C47940 is high ($$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which welds better, C28000 or C47940?
C28000. Its weldability rates fair (50/100) against poor (25/100) for C47940.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C28000 and C47940 side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.