Copper Alloy C90700 vs GRCop-42
Copper Alloy · grade comparison
Copper Alloy C90700 and GRCop-42 are both copper alloy grades. GRCop-42 is the stronger of the two: yield strength 275 MPa (39.9 ksi) against 152 MPa (22 ksi) for C90700, about 81% more; tensile strength follows at 455 MPa (66 ksi) vs 305 MPa (44.2 ksi). GRCop-42 is the more ductile: elongation 33% versus 12% for C90700, and GRCop-42 is harder (132 HV vs 85 HV). GRCop-42 is stiffer (120 GPa vs 110 GPa) and GRCop-42 runs hotter in service (700°C vs 250°C continuous). On the shop floor, GRCop-42 machines more easily (good vs fair) and GRCop-42 welds better (good vs poor).
GRCop-42Choose it when strength drives the design, or when the part is bent, formed or impact-loaded.
C90700 vs GRCop-42: 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
Reduction in Area
Compressive Strength
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Hardness, Rockwell B
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)
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)
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 | C90700 | GRCop-42 |
|---|---|---|
| Default condition | — | — |
| Relative cost | $$$$ High | $$$$ High |
| Min. machined wall | — | — |
| Best machined surface | — | — |
Both take the same 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C90700 vs GRCop-42 — frequently asked
Is GRCop-42 stronger than C90700?
Yes. GRCop-42 has a typical yield strength of 275 MPa (39.9 ksi) against 152 MPa (22 ksi) for C90700 — about 81% more. Tensile strength is 455 MPa (66 ksi) vs 305 MPa (44.2 ksi).
Which is cheaper, C90700 or GRCop-42?
Both sit in the same relative cost tier ($$$$, 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 GRCop-42?
GRCop-42. Its machinability rates good (55/100) against fair (45/100) for C90700; for welding the order is GRCop-42 first (good, 60/100) then C90700 (poor, 25/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C90700 and GRCop-42 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.