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Solder Alloy 703 vs. Solder Alloy 171

Both solder alloy 703 and solder alloy 171 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 64% of their average alloy composition in common.

For each property being compared, the top bar is solder alloy 703 and the bottom bar is solder alloy 171.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 15
16
Elastic (Young's, Tensile) Modulus, GPa 51
38
Elongation at Break, % 35
45
Poisson's Ratio 0.36
0.39
Shear Modulus, GPa 19
14
Tensile Strength: Ultimate (UTS), MPa 57
48

Thermal Properties

Latent Heat of Fusion, J/g 61
47
Melting Completion (Liquidus), °C 220
180
Melting Onset (Solidus), °C 220
180
Specific Heat Capacity, J/kg-K 220
190
Thermal Conductivity, W/m-K 55
50
Thermal Expansion, µm/m-K 22
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
12
Electrical Conductivity: Equal Weight (Specific), % IACS 17
12

Otherwise Unclassified Properties

Density, g/cm3 7.4
8.8
Embodied Carbon, kg CO2/kg material 18
13
Embodied Energy, MJ/kg 300
210

Common Calculations

Stiffness to Weight: Axial, points 3.8
2.4
Stiffness to Weight: Bending, points 17
13
Strength to Weight: Axial, points 2.1
1.5
Strength to Weight: Bending, points 4.4
3.3
Thermal Diffusivity, mm2/s 33
30
Thermal Shock Resistance, points 3.7
3.7

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 0 to 0.1
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
0 to 0.0020
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
34.7 to 36.7
Nickel (Ni), % 0 to 0.010
0 to 0.010
Silver (Ag), % 3.3 to 3.7
1.8 to 2.2
Tin (Sn), % 95.8 to 96.7
61.5 to 62.5
Zinc (Zn), % 0 to 0.0010
0 to 0.0010