Solder Alloy 136 vs. Solder Alloy 721
Both solder alloy 136 and solder alloy 721 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (2, in this case) are not shown.
For each property being compared, the top bar is solder alloy 136 and the bottom bar is solder alloy 721.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 25 | |
| 51 |
| Elongation at Break, % | 19 | |
| 17 |
| Poisson's Ratio | 0.42 | |
| 0.36 |
| Shear Modulus, GPa | 8.9 | |
| 19 |
| Tensile Strength: Ultimate (UTS), MPa | 34 | |
| 50 |
Thermal Properties
| Latent Heat of Fusion, J/g | 34 | |
| 61 |
| Melting Completion (Liquidus), °C | 260 | |
| 220 |
| Melting Onset (Solidus), °C | 190 | |
| 210 |
| Specific Heat Capacity, J/kg-K | 150 | |
| 220 |
| Thermal Conductivity, W/m-K | 40 | |
| 56 |
| Thermal Expansion, µm/m-K | 27 | |
| 22 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 9.2 | |
| 14 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.0 | |
| 17 |
Otherwise Unclassified Properties
| Density, g/cm3 | 10 | |
| 7.4 |
| Embodied Carbon, kg CO2/kg material | 6.8 | |
| 17 |
| Embodied Energy, MJ/kg | 110 | |
| 280 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.4 | |
| 3.8 |
| Stiffness to Weight: Bending, points | 9.5 | |
| 17 |
| Strength to Weight: Axial, points | 0.92 | |
| 1.9 |
| Strength to Weight: Bending, points | 2.3 | |
| 4.1 |
| Thermal Diffusivity, mm2/s | 26 | |
| 34 |
| Thermal Shock Resistance, points | 3.6 | |
| 3.2 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0 to 0.0010 |
| Antimony (Sb), % | 0.5 to 2.0 | |
| 0 to 0.1 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 to 0.030 |
| Bismuth (Bi), % | 0 to 0.25 | |
| 0.8 to 1.2 |
| Cadmium (Cd), % | 0 to 0.0050 | |
| 0 to 0.0020 |
| Copper (Cu), % | 0 to 0.080 | |
| 0.3 to 0.7 |
| Gold (Au), % | 0 to 0.050 | |
| 0 to 0.050 |
| Indium (In), % | 0 to 0.1 | |
| 0 to 0.1 |
| Iron (Fe), % | 0 to 0.020 | |
| 0 to 0.020 |
| Lead (Pb), % | 71.9 to 75 | |
| 0 to 0.070 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 to 0.010 |
| Silver (Ag), % | 0 to 0.1 | |
| 2.3 to 2.7 |
| Tin (Sn), % | 24.5 to 25.5 | |
| 95 to 96.6 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 to 0.0010 |