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Solder Alloy 151 vs. Solder Alloy 181

Both solder alloy 151 and solder alloy 181 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 151 and the bottom bar is solder alloy 181.

Metric UnitsUS Customary Units

Mechanical Properties

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

Thermal Properties

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

Electrical Properties

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

Otherwise Unclassified Properties

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

Common Calculations

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

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), % 17.5 to 18.5
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), % 30.3 to 33
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), % 49.5 to 50.5
0 to 0.25
Zinc (Zn), % 0 to 0.0010
0 to 0.0010