Solder Alloy 721 vs. C99750 Brass
Solder alloy 721 belongs to the otherwise unclassified metals classification, while C99750 brass belongs to the copper alloys. There are 20 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is solder alloy 721 and the bottom bar is C99750 brass.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 51 | |
| 130 |
| Elongation at Break, % | 17 | |
| 20 to 30 |
| Poisson's Ratio | 0.36 | |
| 0.32 |
| Shear Modulus, GPa | 19 | |
| 48 |
| Tensile Strength: Ultimate (UTS), MPa | 50 | |
| 450 to 520 |
Thermal Properties
| Latent Heat of Fusion, J/g | 61 | |
| 200 |
| Melting Completion (Liquidus), °C | 220 | |
| 840 |
| Melting Onset (Solidus), °C | 210 | |
| 820 |
| Specific Heat Capacity, J/kg-K | 220 | |
| 410 |
| Thermal Expansion, µm/m-K | 22 | |
| 20 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 14 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 17 | |
| 2.2 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.4 | |
| 8.1 |
| Embodied Carbon, kg CO2/kg material | 17 | |
| 3.1 |
| Embodied Energy, MJ/kg | 280 | |
| 51 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.8 | |
| 8.6 |
| Stiffness to Weight: Bending, points | 17 | |
| 21 |
| Strength to Weight: Axial, points | 1.9 | |
| 15 to 18 |
| Strength to Weight: Bending, points | 4.1 | |
| 16 to 18 |
| Thermal Shock Resistance, points | 3.2 | |
| 13 to 15 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0.25 to 3.0 |
| 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 | |
| 55 to 61 |
| Gold (Au), % | 0 to 0.050 | |
| 0 |
| Indium (In), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.020 | |
| 0 to 1.0 |
| Lead (Pb), % | 0 to 0.070 | |
| 0.5 to 2.5 |
| Manganese (Mn), % | 0 | |
| 17 to 23 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 to 5.0 |
| Silver (Ag), % | 2.3 to 2.7 | |
| 0 |
| Tin (Sn), % | 95 to 96.6 | |
| 0 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 17 to 23 |
| Residuals, % | 0 | |
| 0 to 0.3 |