Solder Alloy 137 vs. Solder Alloy 121
Both solder alloy 137 and solder alloy 121 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a moderately high 94% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.
For each property being compared, the top bar is solder alloy 137 and the bottom bar is solder alloy 121.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 24 | |
| 21 |
| Elongation at Break, % | 19 | |
| 25 |
| Poisson's Ratio | 0.42 | |
| 0.43 |
| Shear Modulus, GPa | 8.3 | |
| 7.5 |
| Tensile Strength: Ultimate (UTS), MPa | 34 | |
| 32 |
Thermal Properties
| Latent Heat of Fusion, J/g | 33 | |
| 29 |
| Melting Completion (Liquidus), °C | 270 | |
| 290 |
| Melting Onset (Solidus), °C | 190 | |
| 230 |
| Specific Heat Capacity, J/kg-K | 150 | |
| 140 |
| Thermal Conductivity, W/m-K | 38 | |
| 31 |
| Thermal Expansion, µm/m-K | 27 | |
| 28 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 8.9 | |
| 8.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 7.7 | |
| 7.4 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 85 | |
| 80 |
| Density, g/cm3 | 10 | |
| 11 |
| Embodied Carbon, kg CO2/kg material | 6.3 | |
| 5.6 |
| Embodied Energy, MJ/kg | 100 | |
| 93 |
| Embodied Water, L/kg | 660 | |
| 580 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.3 | |
| 1.1 |
| Stiffness to Weight: Bending, points | 9.2 | |
| 8.6 |
| Strength to Weight: Axial, points | 0.9 | |
| 0.84 |
| Strength to Weight: Bending, points | 2.2 | |
| 2.1 |
| Thermal Diffusivity, mm2/s | 25 | |
| 20 |
| Thermal Shock Resistance, points | 3.7 | |
| 3.9 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0 to 0.0010 |
| Antimony (Sb), % | 0.5 to 3.0 | |
| 0 to 0.5 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 to 0.030 |
| Bismuth (Bi), % | 0 to 0.25 | |
| 0 to 0.25 |
| Cadmium (Cd), % | 0 to 0.0050 | |
| 0 to 0.0050 |
| Copper (Cu), % | 0 to 0.080 | |
| 0 to 0.080 |
| 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), % | 75.9 to 80 | |
| 83.4 to 85.5 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 to 0.010 |
| Silver (Ag), % | 0 to 0.1 | |
| 0 to 0.1 |
| Tin (Sn), % | 19.5 to 20.5 | |
| 14.5 to 15.5 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 to 0.0010 |