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Solder Alloy 721 vs. Grade 2 Babbitt Metal

Both solder alloy 721 and grade 2 Babbitt Metal are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 89% of their average alloy composition in common. There are 13 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

For each property being compared, the top bar is solder alloy 721 and the bottom bar is grade 2 Babbitt Metal.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
53
Poisson's Ratio 0.36
0.35
Shear Modulus, GPa 19
19

Thermal Properties

Latent Heat of Fusion, J/g 61
72
Melting Completion (Liquidus), °C 220
350
Melting Onset (Solidus), °C 210
240
Specific Heat Capacity, J/kg-K 220
230
Thermal Expansion, µm/m-K 22
21

Otherwise Unclassified Properties

Density, g/cm3 7.4
7.3
Embodied Carbon, kg CO2/kg material 17
12
Embodied Energy, MJ/kg 280
200

Common Calculations

Stiffness to Weight: Axial, points 3.8
4.0
Stiffness to Weight: Bending, points 17
17

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0050
Antimony (Sb), % 0 to 0.1
7.0 to 8.0
Arsenic (As), % 0 to 0.030
0 to 0.1
Bismuth (Bi), % 0.8 to 1.2
0 to 0.080
Cadmium (Cd), % 0 to 0.0020
0 to 0.050
Copper (Cu), % 0.3 to 0.7
3.0 to 4.0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.080
Lead (Pb), % 0 to 0.070
0 to 0.35
Nickel (Ni), % 0 to 0.010
0
Silver (Ag), % 2.3 to 2.7
0
Tin (Sn), % 95 to 96.6
87.3 to 90
Zinc (Zn), % 0 to 0.0010
0 to 0.0050