Solder Alloy 721 vs. C18700 Copper
Solder alloy 721 belongs to the otherwise unclassified metals classification, while C18700 copper belongs to the copper alloys. There are 22 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is solder alloy 721 and the bottom bar is C18700 copper.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 51 | |
| 110 |
| Elongation at Break, % | 17 | |
| 9.0 to 9.6 |
| Poisson's Ratio | 0.36 | |
| 0.34 |
| Shear Modulus, GPa | 19 | |
| 43 |
| Tensile Strength: Ultimate (UTS), MPa | 50 | |
| 290 to 330 |
Thermal Properties
| Latent Heat of Fusion, J/g | 61 | |
| 210 |
| Melting Completion (Liquidus), °C | 220 | |
| 1080 |
| Melting Onset (Solidus), °C | 210 | |
| 950 |
| Specific Heat Capacity, J/kg-K | 220 | |
| 380 |
| Thermal Conductivity, W/m-K | 56 | |
| 380 |
| Thermal Expansion, µm/m-K | 22 | |
| 17 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 14 | |
| 98 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 17 | |
| 99 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.4 | |
| 9.0 |
| Embodied Carbon, kg CO2/kg material | 17 | |
| 2.6 |
| Embodied Energy, MJ/kg | 280 | |
| 41 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.8 | |
| 7.1 |
| Stiffness to Weight: Bending, points | 17 | |
| 18 |
| Strength to Weight: Axial, points | 1.9 | |
| 9.0 to 10 |
| Strength to Weight: Bending, points | 4.1 | |
| 11 to 12 |
| Thermal Diffusivity, mm2/s | 34 | |
| 110 |
| Thermal Shock Resistance, points | 3.2 | |
| 10 to 12 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0 |
| Antimony (Sb), % | 0 to 0.1 | |
| 0 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 |
| Bismuth (Bi), % | 0.8 to 1.2 | |
| 0 |
| Cadmium (Cd), % | 0 to 0.0020 | |
| 0 |
| Copper (Cu), % | 0.3 to 0.7 | |
| 98 to 99.2 |
| Gold (Au), % | 0 to 0.050 | |
| 0 |
| Indium (In), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.020 | |
| 0 |
| Lead (Pb), % | 0 to 0.070 | |
| 0.8 to 1.5 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 |
| Silver (Ag), % | 2.3 to 2.7 | |
| 0 |
| Tin (Sn), % | 95 to 96.6 | |
| 0 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.5 |