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Solder Alloy 181 vs. Solder Alloy 137

Both solder alloy 181 and solder alloy 137 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 78% of their average alloy composition in common. There are 22 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 181 and the bottom bar is solder alloy 137.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 18
24
Elongation at Break, % 41
19
Poisson's Ratio 0.44
0.42
Shear Modulus, GPa 6.1
8.3
Tensile Strength: Ultimate (UTS), MPa 27
34

Thermal Properties

Latent Heat of Fusion, J/g 26
33
Melting Completion (Liquidus), °C 310
270
Melting Onset (Solidus), °C 300
190
Specific Heat Capacity, J/kg-K 130
150
Thermal Conductivity, W/m-K 24
38
Thermal Expansion, µm/m-K 29
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.3
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
7.7

Otherwise Unclassified Properties

Density, g/cm3 11
10
Embodied Carbon, kg CO2/kg material 6.2
6.3
Embodied Energy, MJ/kg 100
100

Common Calculations

Stiffness to Weight: Axial, points 0.86
1.3
Stiffness to Weight: Bending, points 7.7
9.2
Strength to Weight: Axial, points 0.66
0.9
Strength to Weight: Bending, points 1.8
2.2
Thermal Diffusivity, mm2/s 16
25
Thermal Shock Resistance, points 3.8
3.7

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 0 to 0.2
0.5 to 3.0
Arsenic (As), % 0 to 0.030
0 to 0.030
Bismuth (Bi), % 0 to 0.1
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), % 96.2 to 98
75.9 to 80
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
19.5 to 20.5
Zinc (Zn), % 0 to 0.0010
0 to 0.0010