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ASTM B631 Class B vs. Zamak 2

ASTM B631 class B belongs to the otherwise unclassified metals classification, while Zamak 2 belongs to the zinc alloys. There are 17 material properties with values for both materials. Properties with values for just one material (18, 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 B and the bottom bar is Zamak 2.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 210
87
Poisson's Ratio 0.31
0.26
Rockwell B Hardness 53 to 85
63
Shear Modulus, GPa 78 to 79
33

Thermal Properties

Latent Heat of Fusion, J/g 150
130
Melting Completion (Liquidus), °C 2460 to 2480
390
Specific Heat Capacity, J/kg-K 170
410
Thermal Conductivity, W/m-K 450
110
Thermal Expansion, µm/m-K 12
28

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 50 to 53
25
Electrical Conductivity: Equal Weight (Specific), % IACS 32 to 34
35

Otherwise Unclassified Properties

Density, g/cm3 14
6.5
Embodied Carbon, kg CO2/kg material 49
3.0
Embodied Energy, MJ/kg 760
57

Common Calculations

Stiffness to Weight: Axial, points 8.1
7.5
Stiffness to Weight: Bending, points 14
23
Thermal Diffusivity, mm2/s 190
41