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Solder Alloy 122 vs. Solder Alloy 181

Both solder alloy 122 and solder alloy 181 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 90% of their average alloy composition in common. There are 22 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.

For each property being compared, the top bar is solder alloy 122 and the bottom bar is solder alloy 181.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 20
18
Elongation at Break, % 30
41
Poisson's Ratio 0.43
0.44
Shear Modulus, GPa 6.9
6.1
Tensile Strength: Ultimate (UTS), MPa 30
27

Thermal Properties

Latent Heat of Fusion, J/g 27
26
Melting Completion (Liquidus), °C 300
310
Melting Onset (Solidus), °C 270
300
Specific Heat Capacity, J/kg-K 140
130
Thermal Conductivity, W/m-K 25
24
Thermal Expansion, µm/m-K 28
29

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
9.3
Electrical Conductivity: Equal Weight (Specific), % IACS 7.3
7.4

Otherwise Unclassified Properties

Density, g/cm3 11
11
Embodied Carbon, kg CO2/kg material 5.0
6.2
Embodied Energy, MJ/kg 84
100

Common Calculations

Stiffness to Weight: Axial, points 1.0
0.86
Stiffness to Weight: Bending, points 8.2
7.7
Strength to Weight: Axial, points 0.77
0.66
Strength to Weight: Bending, points 2.0
1.8
Thermal Diffusivity, mm2/s 17
16
Thermal Shock Resistance, points 3.9
3.8

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 0 to 0.5
0 to 0.2
Arsenic (As), % 0 to 0.030
0 to 0.030
Bismuth (Bi), % 0 to 0.25
0 to 0.1
Cadmium (Cd), % 0 to 0.0050
0 to 0.0020
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), % 88.4 to 90.5
96.2 to 98
Nickel (Ni), % 0 to 0.010
0 to 0.010
Silver (Ag), % 0 to 0.1
2.0 to 3.0
Tin (Sn), % 9.5 to 10.5
0 to 0.25
Zinc (Zn), % 0 to 0.0010
0 to 0.0010