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C68700 Brass vs. Solder Alloy 121

C68700 brass belongs to the copper alloys classification, while solder alloy 121 belongs to the otherwise unclassified metals. There are 23 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 C68700 brass and the bottom bar is solder alloy 121.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 110
21
Poisson's Ratio 0.32
0.43
Shear Modulus, GPa 41
7.5
Tensile Strength: Ultimate (UTS), MPa 390
32

Thermal Properties

Latent Heat of Fusion, J/g 190
29
Melting Completion (Liquidus), °C 970
290
Melting Onset (Solidus), °C 930
230
Specific Heat Capacity, J/kg-K 400
140
Thermal Conductivity, W/m-K 100
31
Thermal Expansion, µm/m-K 19
28

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 23
8.8
Electrical Conductivity: Equal Weight (Specific), % IACS 25
7.4

Otherwise Unclassified Properties

Base Metal Price, % relative 26
80
Density, g/cm3 8.3
11
Embodied Carbon, kg CO2/kg material 2.8
5.6
Embodied Energy, MJ/kg 46
93
Embodied Water, L/kg 340
580

Common Calculations

Stiffness to Weight: Axial, points 7.3
1.1
Stiffness to Weight: Bending, points 19
8.6
Strength to Weight: Axial, points 13
0.84
Strength to Weight: Bending, points 14
2.1
Thermal Diffusivity, mm2/s 30
20
Thermal Shock Resistance, points 13
3.9

Alloy Composition

Aluminum (Al), % 1.8 to 2.5
0 to 0.0010
Antimony (Sb), % 0
0 to 0.5
Arsenic (As), % 0.020 to 0.1
0 to 0.030
Bismuth (Bi), % 0
0 to 0.25
Cadmium (Cd), % 0
0 to 0.0050
Copper (Cu), % 76 to 79
0 to 0.080
Gold (Au), % 0
0 to 0.050
Indium (In), % 0
0 to 0.1
Iron (Fe), % 0 to 0.060
0 to 0.020
Lead (Pb), % 0 to 0.070
83.4 to 85.5
Nickel (Ni), % 0
0 to 0.010
Silver (Ag), % 0
0 to 0.1
Tin (Sn), % 0
14.5 to 15.5
Zinc (Zn), % 17.8 to 22.2
0 to 0.0010
Residuals, % 0 to 0.5
0