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Solder Alloy 137 vs. Solder Alloy 704

Both solder alloy 137 and solder alloy 704 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a modest 20% 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 (3, in this case) are not shown.

For each property being compared, the top bar is solder alloy 137 and the bottom bar is solder alloy 704.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 24
51
Elongation at Break, % 19
30
Poisson's Ratio 0.42
0.36
Shear Modulus, GPa 8.3
19
Tensile Strength: Ultimate (UTS), MPa 34
55

Thermal Properties

Latent Heat of Fusion, J/g 33
62
Melting Completion (Liquidus), °C 270
240
Melting Onset (Solidus), °C 190
220
Specific Heat Capacity, J/kg-K 150
220
Thermal Conductivity, W/m-K 38
50
Thermal Expansion, µm/m-K 27
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.9
13
Electrical Conductivity: Equal Weight (Specific), % IACS 7.7
15

Otherwise Unclassified Properties

Density, g/cm3 10
7.5
Embodied Carbon, kg CO2/kg material 6.3
19
Embodied Energy, MJ/kg 100
320

Common Calculations

Stiffness to Weight: Axial, points 1.3
3.8
Stiffness to Weight: Bending, points 9.2
17
Strength to Weight: Axial, points 0.9
2.1
Strength to Weight: Bending, points 2.2
4.3
Thermal Diffusivity, mm2/s 25
30
Thermal Shock Resistance, points 3.7
3.5

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 0.5 to 3.0
0 to 0.1
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 0.050
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), % 75.9 to 80
0 to 0.070
Nickel (Ni), % 0 to 0.010
0 to 0.010
Silver (Ag), % 0 to 0.1
4.8 to 5.2
Tin (Sn), % 19.5 to 20.5
94.3 to 95.2
Zinc (Zn), % 0 to 0.0010
0 to 0.0010