C66700 Brass vs. C78200 Nickel Silver
Both C66700 brass and C78200 nickel silver are copper alloys. They have 90% of their average alloy composition in common.
For each property being compared, the top bar is C66700 brass and the bottom bar is C78200 nickel silver.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 110 | |
| 110 |
| Elongation at Break, % | 2.0 to 58 | |
| 3.0 to 40 |
| Poisson's Ratio | 0.31 | |
| 0.32 |
| Rockwell B Hardness | 57 to 93 | |
| 65 to 90 |
| Rockwell Superficial 30T Hardness | 30 to 90 | |
| 63 to 75 |
| Shear Modulus, GPa | 41 | |
| 43 |
| Shear Strength, MPa | 250 to 530 | |
| 280 to 400 |
| Tensile Strength: Ultimate (UTS), MPa | 340 to 690 | |
| 370 to 630 |
| Tensile Strength: Yield (Proof), MPa | 100 to 640 | |
| 170 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 180 | |
| 190 |
| Maximum Temperature: Mechanical, °C | 140 | |
| 160 |
| Melting Completion (Liquidus), °C | 1090 | |
| 1000 |
| Melting Onset (Solidus), °C | 1050 | |
| 970 |
| Specific Heat Capacity, J/kg-K | 390 | |
| 390 |
| Thermal Conductivity, W/m-K | 97 | |
| 48 |
| Thermal Expansion, µm/m-K | 20 | |
| 19 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 17 | |
| 11 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 19 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 25 | |
| 28 |
| Density, g/cm3 | 8.2 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.7 | |
| 3.3 |
| Embodied Energy, MJ/kg | 45 | |
| 52 |
| Embodied Water, L/kg | 320 | |
| 310 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 13 to 150 | |
| 18 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 49 to 1900 | |
| 130 to 1440 |
| Stiffness to Weight: Axial, points | 7.3 | |
| 7.4 |
| Stiffness to Weight: Bending, points | 19 | |
| 19 |
| Strength to Weight: Axial, points | 11 to 23 | |
| 12 to 21 |
| Strength to Weight: Bending, points | 13 to 21 | |
| 14 to 19 |
| Thermal Diffusivity, mm2/s | 30 | |
| 15 |
| Thermal Shock Resistance, points | 11 to 23 | |
| 12 to 21 |
Alloy Composition
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| Copper (Cu), % | 68.5 to 71.5 | |
| 63 to 67 |
| Iron (Fe), % | 0 to 0.1 | |
| 0 to 0.35 |
| Lead (Pb), % | 0 to 0.070 | |
| 1.5 to 2.5 |
| Manganese (Mn), % | 0.8 to 1.5 | |
| 0 to 0.5 |
| Nickel (Ni), % | 0 | |
| 7.0 to 9.0 |
| Zinc (Zn), % | 26.3 to 30.7 | |
| 20.2 to 28.5 |
| Residuals, % | 0 to 0.5 | |
| 0 to 0.5 |