Solder Alloy 502 vs. Solder Alloy 702
Both solder alloy 502 and solder alloy 702 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 96% of their average alloy composition in common.
For each property being compared, the top bar is solder alloy 502 and the bottom bar is solder alloy 702.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 53 | |
| 51 |
| Elongation at Break, % | 34 | |
| 21 |
| Poisson's Ratio | 0.36 | |
| 0.36 |
| Shear Modulus, GPa | 19 | |
| 19 |
| Tensile Strength: Ultimate (UTS), MPa | 58 | |
| 53 |
Thermal Properties
| Latent Heat of Fusion, J/g | 66 | |
| 61 |
| Melting Completion (Liquidus), °C | 350 | |
| 220 |
| Melting Onset (Solidus), °C | 220 | |
| 220 |
| Specific Heat Capacity, J/kg-K | 230 | |
| 220 |
| Thermal Conductivity, W/m-K | 47 | |
| 62 |
| Thermal Expansion, µm/m-K | 22 | |
| 22 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 12 | |
| 15 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 15 | |
| 18 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.4 | |
| 7.4 |
| Embodied Carbon, kg CO2/kg material | 15 | |
| 17 |
| Embodied Energy, MJ/kg | 260 | |
| 290 |
Common Calculations
| Stiffness to Weight: Axial, points | 4.0 | |
| 3.8 |
| Stiffness to Weight: Bending, points | 17 | |
| 17 |
| Strength to Weight: Axial, points | 2.2 | |
| 2.0 |
| Strength to Weight: Bending, points | 4.5 | |
| 4.2 |
| Thermal Diffusivity, mm2/s | 28 | |
| 38 |
| Thermal Shock Resistance, points | 3.6 | |
| 3.4 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.0010 | |
| 0 to 0.0010 |
| Antimony (Sb), % | 0 to 0.1 | |
| 0 to 0.1 |
| Arsenic (As), % | 0 to 0.030 | |
| 0 to 0.030 |
| Bismuth (Bi), % | 0 to 0.080 | |
| 0 to 0.1 |
| Cadmium (Cd), % | 0 to 0.0020 | |
| 0 to 0.0020 |
| Copper (Cu), % | 3.5 to 4.5 | |
| 0 to 0.050 |
| 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), % | 0 to 0.070 | |
| 0 to 0.070 |
| Nickel (Ni), % | 0 to 0.010 | |
| 0 to 0.010 |
| Silver (Ag), % | 0.8 to 1.2 | |
| 2.8 to 3.2 |
| Tin (Sn), % | 93.8 to 95.7 | |
| 96.3 to 97.2 |
| Zinc (Zn), % | 0 to 0.0010 | |
| 0 to 0.0010 |