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Solder Alloy 121 vs. C87700 Bronze

Solder alloy 121 belongs to the otherwise unclassified metals classification, while C87700 bronze belongs to the copper alloys. There are 24 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.

For each property being compared, the top bar is solder alloy 121 and the bottom bar is C87700 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 21
110
Elongation at Break, % 25
3.6
Poisson's Ratio 0.43
0.33
Shear Modulus, GPa 7.5
42
Tensile Strength: Ultimate (UTS), MPa 32
300

Thermal Properties

Latent Heat of Fusion, J/g 29
250
Melting Completion (Liquidus), °C 290
980
Melting Onset (Solidus), °C 230
900
Specific Heat Capacity, J/kg-K 140
400
Thermal Conductivity, W/m-K 31
120
Thermal Expansion, µm/m-K 28
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
45
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
48

Otherwise Unclassified Properties

Base Metal Price, % relative 80
29
Density, g/cm3 11
8.5
Embodied Carbon, kg CO2/kg material 5.6
2.7
Embodied Energy, MJ/kg 93
45
Embodied Water, L/kg 580
310

Common Calculations

Stiffness to Weight: Axial, points 1.1
7.4
Stiffness to Weight: Bending, points 8.6
19
Strength to Weight: Axial, points 0.84
9.8
Strength to Weight: Bending, points 2.1
12
Thermal Diffusivity, mm2/s 20
34
Thermal Shock Resistance, points 3.9
11

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
Antimony (Sb), % 0 to 0.5
0 to 0.1
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
87.5 to 90.5
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.5
Lead (Pb), % 83.4 to 85.5
0 to 0.090
Manganese (Mn), % 0
0 to 0.8
Nickel (Ni), % 0 to 0.010
0 to 0.25
Phosphorus (P), % 0
0 to 0.15
Silicon (Si), % 0
2.5 to 3.5
Silver (Ag), % 0 to 0.1
0
Tin (Sn), % 14.5 to 15.5
0 to 2.0
Zinc (Zn), % 0 to 0.0010
7.0 to 9.0
Residuals, % 0
0 to 0.8