Solder Alloy 121 vs. R30816 Cobalt
Solder alloy 121 belongs to the otherwise unclassified metals classification, while R30816 cobalt belongs to the cobalt alloys. There are 22 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is solder alloy 121 and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 11 | |
| 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 21 | |
| 210 |
| Elongation at Break, % | 25 | |
| 23 |
| Poisson's Ratio | 0.43 | |
| 0.3 |
| Shear Modulus, GPa | 7.5 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 32 | |
| 1020 |
Thermal Properties
| Latent Heat of Fusion, J/g | 29 | |
| 300 |
| Melting Completion (Liquidus), °C | 290 | |
| 1540 |
| Melting Onset (Solidus), °C | 230 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 140 | |
| 420 |
| Thermal Conductivity, W/m-K | 31 | |
| 13 |
| Thermal Expansion, µm/m-K | 28 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 11 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 5.6 | |
| 20 |
| Embodied Energy, MJ/kg | 93 | |
| 320 |
| Embodied Water, L/kg | 580 | |
| 440 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.1 | |
| 13 |
| Stiffness to Weight: Bending, points | 8.6 | |
| 22 |
| Strength to Weight: Axial, points | 0.84 | |
| 31 |
| Strength to Weight: Bending, points | 2.1 | |
| 25 |
| Thermal Diffusivity, mm2/s | 20 | |
| 3.3 |
| Thermal Shock Resistance, points | 3.9 | |
| 28 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0 |
| Antimony (Sb), % | 0 to 0.5 | |
| 0 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 |
| Bismuth (Bi), % | 0 to 0.25 | |
| 0 |
| Cadmium (Cd), % | 0 to 0.0050 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Copper (Cu), % | 0 to 0.080 | |
| 0 |
| Gold (Au), % | 0 to 0.050 | |
| 0 |
| Indium (In), % | 0 to 0.1 | |
| 0 |
| Iron (Fe), % | 0 to 0.020 | |
| 0 to 5.0 |
| Lead (Pb), % | 83.4 to 85.5 | |
| 0 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 0 to 0.010 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 3.5 to 4.5 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0 to 1.0 |
| Silver (Ag), % | 0 to 0.1 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Tin (Sn), % | 14.5 to 15.5 | |
| 0 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 |