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ASTM B631 Class A vs. Solder Alloy 402

Both ASTM B631 class A and solder alloy 402 are otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is ASTM B631 class A and the bottom bar is solder alloy 402.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
52
Poisson's Ratio 0.3
0.36
Shear Modulus, GPa 85 to 86
19

Thermal Properties

Latent Heat of Fusion, J/g 160
64
Melting Completion (Liquidus), °C 2680 to 2690
310
Specific Heat Capacity, J/kg-K 160
230
Thermal Conductivity, W/m-K 420
61
Thermal Expansion, µm/m-K 11
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40 to 47
15
Electrical Conductivity: Equal Weight (Specific), % IACS 25 to 29
18

Otherwise Unclassified Properties

Density, g/cm3 15
7.3
Embodied Carbon, kg CO2/kg material 43
15
Embodied Energy, MJ/kg 670
250

Common Calculations

Stiffness to Weight: Axial, points 8.5
3.9
Stiffness to Weight: Bending, points 14
17
Thermal Diffusivity, mm2/s 180
37