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Solder Alloy 721 vs. C17000 Copper

Solder alloy 721 belongs to the otherwise unclassified metals classification, while C17000 copper 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 C17000 copper.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 51
120
Elongation at Break, % 17
1.1 to 31
Poisson's Ratio 0.36
0.33
Shear Modulus, GPa 19
45
Tensile Strength: Ultimate (UTS), MPa 50
490 to 1310

Thermal Properties

Latent Heat of Fusion, J/g 61
230
Melting Completion (Liquidus), °C 220
980
Melting Onset (Solidus), °C 210
870
Specific Heat Capacity, J/kg-K 220
390
Thermal Conductivity, W/m-K 56
110
Thermal Expansion, µm/m-K 22
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 14
22
Electrical Conductivity: Equal Weight (Specific), % IACS 17
22

Otherwise Unclassified Properties

Density, g/cm3 7.4
8.8
Embodied Carbon, kg CO2/kg material 17
8.7
Embodied Energy, MJ/kg 280
140

Common Calculations

Stiffness to Weight: Axial, points 3.8
7.6
Stiffness to Weight: Bending, points 17
19
Strength to Weight: Axial, points 1.9
15 to 41
Strength to Weight: Bending, points 4.1
16 to 30
Thermal Diffusivity, mm2/s 34
32
Thermal Shock Resistance, points 3.2
17 to 45

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.2
Antimony (Sb), % 0 to 0.1
0
Arsenic (As), % 0 to 0.030
0
Beryllium (Be), % 0
1.6 to 1.8
Bismuth (Bi), % 0.8 to 1.2
0
Cadmium (Cd), % 0 to 0.0020
0
Copper (Cu), % 0.3 to 0.7
96.3 to 98.2
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
0 to 0.4
Lead (Pb), % 0 to 0.070
0
Nickel (Ni), % 0 to 0.010
0.2 to 0.6
Silicon (Si), % 0
0 to 0.2
Silver (Ag), % 2.3 to 2.7
0
Tin (Sn), % 95 to 96.6
0
Zinc (Zn), % 0 to 0.0010
0
Residuals, % 0
0 to 0.5