Copper Alloy C81700 vs Cu-ETP1
Copper Alloy · grade comparison
Copper Alloy C81700 and Cu-ETP1 are both copper alloy grades. C81700 is the stronger of the two: yield strength 515 MPa (74.7 ksi) against 70 MPa (10.2 ksi) for Cu-ETP1, about 7.4 times as much; tensile strength follows at 655 MPa (95 ksi) vs 220 MPa (31.9 ksi). In exchange, Cu-ETP1 is the more ductile: elongation 40% versus 5% for C81700, and C81700 is harder (200 HB vs 45 HB). C81700 is stiffer (130 GPa vs 117 GPa) and Cu-ETP1 conducts heat better (394 W/m·K vs 190 W/m·K). On the shop floor, C81700 machines more easily (fair vs poor).
C81700Choose it when strength drives the design, or when the part is machined in volume.
Cu-ETP1Choose it when the part is bent, formed or impact-loaded.
C81700 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
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Rockwell C
Reduction in Area
Charpy V-Notch Impact (RT)
Hardness, Vickers
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)
Min Service Temperature
Same in both: Latent Heat of Fusion 205 J/g88.1 BTU/lb · 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)
Same in both: Corrosion Resistance 65 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Castability
Brazeability / Solderability
Polishability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 20%
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 | C81700 | Cu-ETP1 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C81700 vs Cu-ETP1 — frequently asked
Is C81700 stronger than Cu-ETP1?
Yes. C81700 has a typical yield strength of 515 MPa (74.7 ksi) against 70 MPa (10.2 ksi) for Cu-ETP1 — about 7.4 times as much. Tensile strength is 655 MPa (95 ksi) vs 220 MPa (31.9 ksi).
Which is cheaper, C81700 or Cu-ETP1?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, C81700 or Cu-ETP1?
C81700. Its machinability rates fair (45/100) against poor (30/100) for Cu-ETP1; for welding the order is Cu-ETP1 first (fair, 50/100) then C81700 (fair, 45/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C81700 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.