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Solder Alloy 402 vs. Solder Alloy 704

Both solder alloy 402 and solder alloy 704 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 95% 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 402 and the bottom bar is solder alloy 704.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 52
51
Elongation at Break, % 20
30
Poisson's Ratio 0.36
0.36
Shear Modulus, GPa 19
19
Tensile Strength: Ultimate (UTS), MPa 57
55

Thermal Properties

Latent Heat of Fusion, J/g 64
62
Melting Completion (Liquidus), °C 310
240
Melting Onset (Solidus), °C 230
220
Specific Heat Capacity, J/kg-K 230
220
Thermal Conductivity, W/m-K 61
50
Thermal Expansion, µm/m-K 22
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 15
13
Electrical Conductivity: Equal Weight (Specific), % IACS 18
15

Otherwise Unclassified Properties

Density, g/cm3 7.3
7.5
Embodied Carbon, kg CO2/kg material 15
19
Embodied Energy, MJ/kg 250
320

Common Calculations

Stiffness to Weight: Axial, points 3.9
3.8
Stiffness to Weight: Bending, points 17
17
Strength to Weight: Axial, points 2.2
2.1
Strength to Weight: Bending, points 4.5
4.3
Thermal Diffusivity, mm2/s 37
30
Thermal Shock Resistance, points 3.6
3.5

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 0 to 0.1
0 to 0.1
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), % 2.5 to 3.5
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), % 0 to 0.070
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), % 95.9 to 97.5
94.3 to 95.2
Zinc (Zn), % 0 to 0.0010
0 to 0.0010