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Solder Alloy 121 vs. C94100 Bronze

Solder alloy 121 belongs to the otherwise unclassified metals classification, while C94100 bronze belongs to the copper alloys. They have a modest 26% 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 (7, in this case) are not shown.

For each property being compared, the top bar is solder alloy 121 and the bottom bar is C94100 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 21
92
Elongation at Break, % 25
7.8
Poisson's Ratio 0.43
0.36
Shear Modulus, GPa 7.5
34
Tensile Strength: Ultimate (UTS), MPa 32
190

Thermal Properties

Latent Heat of Fusion, J/g 29
160
Melting Completion (Liquidus), °C 290
870
Melting Onset (Solidus), °C 230
790
Specific Heat Capacity, J/kg-K 140
330
Thermal Expansion, µm/m-K 28
20

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
9.0
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
8.8

Otherwise Unclassified Properties

Base Metal Price, % relative 80
29
Density, g/cm3 11
9.2
Embodied Carbon, kg CO2/kg material 5.6
3.0
Embodied Energy, MJ/kg 93
48
Embodied Water, L/kg 580
370

Common Calculations

Stiffness to Weight: Axial, points 1.1
5.5
Stiffness to Weight: Bending, points 8.6
16
Strength to Weight: Axial, points 0.84
5.8
Strength to Weight: Bending, points 2.1
8.1
Thermal Shock Resistance, points 3.9
7.6

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0050
Antimony (Sb), % 0 to 0.5
0 to 0.8
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0 to 0.25
0
Cadmium (Cd), % 0 to 0.0050
0
Copper (Cu), % 0 to 0.080
72 to 79
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.25
Lead (Pb), % 83.4 to 85.5
18 to 22
Nickel (Ni), % 0 to 0.010
0 to 1.0
Phosphorus (P), % 0
0 to 1.5
Silicon (Si), % 0
0 to 0.0050
Silver (Ag), % 0 to 0.1
0
Sulfur (S), % 0
0 to 0.080
Tin (Sn), % 14.5 to 15.5
4.5 to 6.5
Zinc (Zn), % 0 to 0.0010
0 to 1.0
Residuals, % 0
0 to 1.3