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Solder Alloy 102 vs. Solder Alloy 121

Both solder alloy 102 and solder alloy 121 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 52% of their average alloy composition in common. There are 23 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 102 and the bottom bar is solder alloy 121.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 38
21
Elongation at Break, % 48
25
Poisson's Ratio 0.39
0.43
Shear Modulus, GPa 14
7.5
Tensile Strength: Ultimate (UTS), MPa 31
32

Thermal Properties

Latent Heat of Fusion, J/g 46
29
Melting Completion (Liquidus), °C 180
290
Melting Onset (Solidus), °C 180
230
Specific Heat Capacity, J/kg-K 190
140
Thermal Conductivity, W/m-K 53
31
Thermal Expansion, µm/m-K 25
28

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
8.8
Electrical Conductivity: Equal Weight (Specific), % IACS 13
7.4

Otherwise Unclassified Properties

Density, g/cm3 8.8
11
Embodied Carbon, kg CO2/kg material 11
5.6
Embodied Energy, MJ/kg 180
93
Embodied Water, L/kg 930
580

Common Calculations

Stiffness to Weight: Axial, points 2.4
1.1
Stiffness to Weight: Bending, points 13
8.6
Strength to Weight: Axial, points 1.0
0.84
Strength to Weight: Bending, points 2.5
2.1
Thermal Diffusivity, mm2/s 32
20
Thermal Shock Resistance, points 2.4
3.9

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 0 to 0.050
0 to 0.5
Arsenic (As), % 0 to 0.030
0 to 0.030
Bismuth (Bi), % 0 to 0.050
0 to 0.25
Cadmium (Cd), % 0 to 0.0020
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), % 36 to 37.5
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), % 62.5 to 63.5
14.5 to 15.5
Zinc (Zn), % 0 to 0.0010
0 to 0.0010