Copper Alloy C81800 vs Cu-ETP1
Copper Alloy · grade comparison
Copper Alloy C81800 and Cu-ETP1 are both copper alloy grades. C81800 is the stronger of the two: yield strength 550 MPa (79.8 ksi) against 70 MPa (10.2 ksi) for Cu-ETP1, about 7.9 times as much; tensile strength follows at 725 MPa (105 ksi) vs 220 MPa (31.9 ksi). In exchange, Cu-ETP1 is the more ductile: elongation 40% versus 8% for C81800, and C81800 is harder (220 HB vs 45 HB). C81800 is lighter (8.61 g/cm³ vs 8.93 g/cm³ for Cu-ETP1) and C81800 is stiffer (134 GPa vs 117 GPa). On the shop floor, C81800 machines more easily (fair vs poor) and C81800 welds better (good vs fair).
C81800Choose it when strength drives the design, or when weight is the constraint.
Cu-ETP1Choose it when the part is bent, formed or impact-loaded.
C81800 vs Cu-ETP1: 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
Bulk Modulus
Poisson's Ratio
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Rockwell C
Hardness, Vickers
Reduction in Area
Charpy V-Notch Impact (RT)
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)
Max Service Temperature (continuous)
Min Service Temperature
Same in both: Latent Heat of Fusion 205 J/g88.1 BTU/lb
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Galvanic Potential (seawater, vs SCE)
Same in both: Corrosion Resistance 65 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Same in both: Machinability Rating (AISI 1212 = 100 %) 20% · Polishability 80 / 100
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 350 L/kg41.9 gal/lb
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 | C81800 | Cu-ETP1 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C81800 vs Cu-ETP1 — frequently asked
Is C81800 stronger than Cu-ETP1?
Yes. C81800 has a typical yield strength of 550 MPa (79.8 ksi) against 70 MPa (10.2 ksi) for Cu-ETP1 — about 7.9 times as much. Tensile strength is 725 MPa (105 ksi) vs 220 MPa (31.9 ksi).
Which is cheaper, C81800 or Cu-ETP1?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, C81800 or Cu-ETP1?
C81800. Its machinability rates fair (40/100) against poor (30/100) for Cu-ETP1; for welding the order is C81800 first (good, 65/100) then Cu-ETP1 (fair, 50/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C81800 and Cu-ETP1 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.