Copper Alloy C85700 vs C86300
Copper Alloy · grade comparison
Copper Alloy C85700 and C86300 are both copper alloy grades. C86300 is the stronger of the two: yield strength 470 MPa (68.2 ksi) against 140 MPa (20.3 ksi) for C85700, about 3.4 times as much; tensile strength follows at 820 MPa (119 ksi) vs 380 MPa (55.1 ksi). In exchange, C85700 is the more ductile: elongation 18% versus 15% for C86300, and C86300 is harder (225 HB vs 75 HB). C86300 is lighter (7.65 g/cm³ vs 8.41 g/cm³ for C85700) and C85700 conducts heat better (84 W/m·K vs 36 W/m·K). On the shop floor, C85700 machines more easily (very good vs poor), C86300 welds better (30 vs 20 out of 100), and C85700 sits in a lower cost tier (premium, $$$) than C86300 (specialty, $$$$$).
C85700Choose it when the part is bent, formed or impact-loaded, or when the part is machined in volume.
C86300Choose it when strength drives the design, or when weight is the constraint.
C85700 vs C86300: 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
Shear Strength
Fatigue Strength (Endurance Limit)
Charpy V-Notch Impact (RT)
Hardness, Brinell
Reduction in Area
Compressive Strength
Hardness, Rockwell B
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
Thermal Expansion (CTE, 20–100 °C)
Latent Heat of Fusion
Min Service Temperature
Same in both: Specific Heat Capacity 377 J/kg·K0.09 BTU/lb·°F · Max Service Temperature (continuous) 200°C392 °F
Electrical
Conductivity and insulation.
Electrical Conductivity
Electrical Resistivity
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V · Corrosion Resistance 45 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Weldability
Brazeability / Solderability
Polishability
Machinability Rating (AISI 1212 = 100 %)
Formability (cold)
Same in both: Castability 80 / 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
Same in both: Thermal Shock Resistance Index 15
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 | C85700 | C86300 |
|---|---|---|
| CNC machining | — | Yes |
| Default condition | — | As Cast |
| Relative cost | $$$ Premium | $$$$$ Specialty |
| Min. machined wall | — | 0.8 mm |
| Best machined surface | — | Ra 1.6 µm |
| Chrome Plating | — | Yes |
| Electropolishing | — | Yes |
| Nickel Plating | — | Yes |
| Painting | — | Yes |
| Tin Plating | — | Yes |
They share 4 finishes: Copper Plating, Electroless Nickel (EN), Gold Plating, Silver Plating.
C85700 vs C86300 — frequently asked
Is C86300 stronger than C85700?
Yes. C86300 has a typical yield strength of 470 MPa (68.2 ksi) against 140 MPa (20.3 ksi) for C85700 — about 3.4 times as much. Tensile strength is 820 MPa (119 ksi) vs 380 MPa (55.1 ksi).
Which is cheaper, C85700 or C86300?
C85700 is the lower-cost material: it sits in the premium tier ($$$) while C86300 is specialty ($$$$$). Part price depends far more on geometry, tolerance and quantity than on raw stock — upload a CAD file for a live quote.
Which is easier to machine, C85700 or C86300?
C85700. Its machinability rates very good (80/100) against poor (25/100) for C86300; for welding the order is C86300 first (poor, 30/100) then C85700 (poor, 20/100).
Ready to make it?
Upload a CAD file and FabDigit prices the part in C85700 and C86300 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.