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ASTM B631 Class B vs. Solder Alloy 121

Both ASTM B631 class B and solder alloy 121 are otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is ASTM B631 class B and the bottom bar is solder alloy 121.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
21
Poisson's Ratio 0.31
0.43
Shear Modulus, GPa 78 to 79
7.5

Thermal Properties

Latent Heat of Fusion, J/g 150
29
Melting Completion (Liquidus), °C 2460 to 2480
290
Specific Heat Capacity, J/kg-K 170
140
Thermal Conductivity, W/m-K 450
31
Thermal Expansion, µm/m-K 12
28

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 50 to 53
8.8
Electrical Conductivity: Equal Weight (Specific), % IACS 32 to 34
7.4

Otherwise Unclassified Properties

Density, g/cm3 14
11
Embodied Carbon, kg CO2/kg material 49
5.6
Embodied Energy, MJ/kg 760
93

Common Calculations

Stiffness to Weight: Axial, points 8.1
1.1
Stiffness to Weight: Bending, points 14
8.6
Thermal Diffusivity, mm2/s 190
20