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Solder Alloy 121 vs. C94700 Bronze

Solder alloy 121 belongs to the otherwise unclassified metals classification, while C94700 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 C94700 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 21
110
Elongation at Break, % 25
7.9 to 32
Poisson's Ratio 0.43
0.34
Shear Modulus, GPa 7.5
43
Tensile Strength: Ultimate (UTS), MPa 32
350 to 590

Thermal Properties

Latent Heat of Fusion, J/g 29
200
Melting Completion (Liquidus), °C 290
1030
Melting Onset (Solidus), °C 230
900
Specific Heat Capacity, J/kg-K 140
380
Thermal Conductivity, W/m-K 31
54
Thermal Expansion, µm/m-K 28
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 8.8
12
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
12

Otherwise Unclassified Properties

Base Metal Price, % relative 80
34
Density, g/cm3 11
8.8
Embodied Carbon, kg CO2/kg material 5.6
3.5
Embodied Energy, MJ/kg 93
56
Embodied Water, L/kg 580
350

Common Calculations

Stiffness to Weight: Axial, points 1.1
7.3
Stiffness to Weight: Bending, points 8.6
18
Strength to Weight: Axial, points 0.84
11 to 19
Strength to Weight: Bending, points 2.1
13 to 18
Thermal Diffusivity, mm2/s 20
16
Thermal Shock Resistance, points 3.9
12 to 21

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0050
Antimony (Sb), % 0 to 0.5
0 to 0.15
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
85 to 90
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
0 to 0.1
Manganese (Mn), % 0
0 to 0.2
Nickel (Ni), % 0 to 0.010
4.5 to 6.0
Phosphorus (P), % 0
0 to 0.050
Silicon (Si), % 0
0 to 0.0050
Silver (Ag), % 0 to 0.1
0
Sulfur (S), % 0
0 to 0.050
Tin (Sn), % 14.5 to 15.5
4.5 to 6.0
Zinc (Zn), % 0 to 0.0010
1.0 to 2.5
Residuals, % 0
0 to 1.3