Copper Alloy C90700 vs Cu-OF
Copper Alloy · grade comparison
Copper Alloy C90700 and Cu-OF are both copper alloy grades. C90700 is the stronger of the two: tensile strength 305 MPa (44.2 ksi) against 230 MPa (33.4 ksi) for Cu-OF, about 33% more. In exchange, Cu-OF is the more ductile: elongation 30% versus 12% for C90700, and C90700 is harder (80 HB vs 65 HB). C90700 runs hotter in service (250°C vs 200°C continuous) and Cu-OF conducts heat better (340 W/m·K vs 50 W/m·K). On the shop floor, C90700 machines more easily (fair vs poor) and Cu-OF welds better (good vs poor).
C90700Choose it when strength drives the design, or when the part sees heat.
Cu-OFChoose it when the part is bent, formed or impact-loaded, or when it will be welded.
C90700 vs Cu-OF: 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
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
Hardness, Vickers
Fracture Toughness (K_IC)
Same in both: 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
Max Service Temperature (continuous)
Min Service Temperature
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
Machinability Rating (AISI 1212 = 100 %)
Weldability
Formability (cold)
Castability
Brazeability / Solderability
Polishability
Sustainability
Primary-production footprint per kilogram.
Embodied Energy (primary production)
Embodied Carbon (primary production)
Typical Recycled Content
Same in both: Embodied Water 300 L/kg35.9 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 | C90700 | Cu-OF |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C90700 vs Cu-OF — frequently asked
Is C90700 stronger than Cu-OF?
Yes. C90700 has a typical tensile strength of 305 MPa (44.2 ksi) against 230 MPa (33.4 ksi) for Cu-OF — about 33% more.
Which is cheaper, C90700 or Cu-OF?
Both sit in the same relative cost tier ($$$$, high); the part price will be decided by machining time, tolerance and quantity rather than by the material.
Which is easier to machine, C90700 or Cu-OF?
C90700. Its machinability rates fair (45/100) against poor (20/100) for Cu-OF; for welding the order is Cu-OF first (good, 55/100) then C90700 (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C90700 and Cu-OF 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.