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Solder Alloy 181 vs. Solder Alloy 151

Both solder alloy 181 and solder alloy 151 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a modest 32% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 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 181 and the bottom bar is solder alloy 151.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 18
39
Elongation at Break, % 41
37
Poisson's Ratio 0.44
0.37
Shear Modulus, GPa 6.1
14
Tensile Strength: Ultimate (UTS), MPa 27
46

Thermal Properties

Latent Heat of Fusion, J/g 26
47
Melting Completion (Liquidus), °C 310
150
Melting Onset (Solidus), °C 300
150
Specific Heat Capacity, J/kg-K 130
190
Thermal Conductivity, W/m-K 24
44
Thermal Expansion, µm/m-K 29
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.3
10
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
10

Otherwise Unclassified Properties

Density, g/cm3 11
8.8
Embodied Carbon, kg CO2/kg material 6.2
9.2
Embodied Energy, MJ/kg 100
160

Common Calculations

Stiffness to Weight: Axial, points 0.86
2.5
Stiffness to Weight: Bending, points 7.7
13
Strength to Weight: Axial, points 0.66
1.4
Strength to Weight: Bending, points 1.8
3.2
Thermal Diffusivity, mm2/s 16
26
Thermal Shock Resistance, points 3.8
3.2

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 0 to 0.2
0 to 0.2
Arsenic (As), % 0 to 0.030
0 to 0.030
Bismuth (Bi), % 0 to 0.1
0 to 0.1
Cadmium (Cd), % 0 to 0.0020
17.5 to 18.5
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), % 96.2 to 98
30.3 to 33
Nickel (Ni), % 0 to 0.010
0 to 0.010
Silver (Ag), % 2.0 to 3.0
0 to 0.1
Tin (Sn), % 0 to 0.25
49.5 to 50.5
Zinc (Zn), % 0 to 0.0010
0 to 0.0010