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Solder Alloy 201 vs. Solder Alloy 137

Both solder alloy 201 and solder alloy 137 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a modest 22% of their average alloy composition in common, which, by itself, doesn't mean much. 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 201 and the bottom bar is solder alloy 137.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 50
24
Elongation at Break, % 38
19
Poisson's Ratio 0.35
0.42
Shear Modulus, GPa 19
8.3
Tensile Strength: Ultimate (UTS), MPa 41
34

Thermal Properties

Latent Heat of Fusion, J/g 64
33
Melting Completion (Liquidus), °C 240
270
Melting Onset (Solidus), °C 240
190
Specific Heat Capacity, J/kg-K 220
150
Thermal Conductivity, W/m-K 28
38
Thermal Expansion, µm/m-K 21
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
8.9
Electrical Conductivity: Equal Weight (Specific), % IACS 15
7.7

Otherwise Unclassified Properties

Density, g/cm3 7.3
10
Embodied Carbon, kg CO2/kg material 15
6.3
Embodied Energy, MJ/kg 250
100
Embodied Water, L/kg 1320
660

Common Calculations

Stiffness to Weight: Axial, points 3.8
1.3
Stiffness to Weight: Bending, points 17
9.2
Strength to Weight: Axial, points 1.6
0.9
Strength to Weight: Bending, points 3.6
2.2
Thermal Diffusivity, mm2/s 17
25
Thermal Shock Resistance, points 2.7
3.7

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 4.5 to 5.5
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 0.050
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), % 0 to 0.070
75.9 to 80
Nickel (Ni), % 0 to 0.010
0 to 0.010
Silver (Ag), % 0 to 0.1
0 to 0.1
Tin (Sn), % 94 to 95.5
19.5 to 20.5
Zinc (Zn), % 0 to 0.0010
0 to 0.0010