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Solder Alloy 721 vs. C90200 Bronze

Solder alloy 721 belongs to the otherwise unclassified metals classification, while C90200 bronze belongs to the copper alloys. 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 721 and the bottom bar is C90200 bronze.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
110
Elongation at Break, % 17
30
Poisson's Ratio 0.36
0.34
Shear Modulus, GPa 19
41
Tensile Strength: Ultimate (UTS), MPa 50
260

Thermal Properties

Latent Heat of Fusion, J/g 61
200
Melting Completion (Liquidus), °C 220
1050
Melting Onset (Solidus), °C 210
880
Specific Heat Capacity, J/kg-K 220
370
Thermal Conductivity, W/m-K 56
62
Thermal Expansion, µm/m-K 22
18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
13
Electrical Conductivity: Equal Weight (Specific), % IACS 17
13

Otherwise Unclassified Properties

Density, g/cm3 7.4
8.8
Embodied Carbon, kg CO2/kg material 17
3.3
Embodied Energy, MJ/kg 280
53

Common Calculations

Stiffness to Weight: Axial, points 3.8
7.0
Stiffness to Weight: Bending, points 17
18
Strength to Weight: Axial, points 1.9
8.3
Strength to Weight: Bending, points 4.1
10
Thermal Diffusivity, mm2/s 34
19
Thermal Shock Resistance, points 3.2
9.5

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0050
Antimony (Sb), % 0 to 0.1
0 to 0.2
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0.8 to 1.2
0
Cadmium (Cd), % 0 to 0.0020
0
Copper (Cu), % 0.3 to 0.7
91 to 94
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.2
Lead (Pb), % 0 to 0.070
0 to 0.3
Nickel (Ni), % 0 to 0.010
0 to 0.5
Phosphorus (P), % 0
0 to 0.050
Silicon (Si), % 0
0 to 0.0050
Silver (Ag), % 2.3 to 2.7
0
Sulfur (S), % 0
0 to 0.050
Tin (Sn), % 95 to 96.6
6.0 to 8.0
Zinc (Zn), % 0 to 0.0010
0 to 0.5
Residuals, % 0
0 to 0.6