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Zamak 7 vs. ASTM B631 Class A

Zamak 7 belongs to the zinc alloys classification, while ASTM B631 class A belongs to the otherwise unclassified metals. There are 16 material properties with values for both materials. Properties with values for just one material (19, 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 Zamak 7 and the bottom bar is ASTM B631 class A.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 86
220
Poisson's Ratio 0.25
0.3
Shear Modulus, GPa 33
85 to 86

Thermal Properties

Latent Heat of Fusion, J/g 120
160
Melting Completion (Liquidus), °C 390
2680 to 2690
Specific Heat Capacity, J/kg-K 410
160
Thermal Conductivity, W/m-K 110
420
Thermal Expansion, µm/m-K 27
11

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
40 to 47
Electrical Conductivity: Equal Weight (Specific), % IACS 38
25 to 29

Otherwise Unclassified Properties

Density, g/cm3 6.4
15
Embodied Carbon, kg CO2/kg material 3.0
43
Embodied Energy, MJ/kg 57
670

Common Calculations

Stiffness to Weight: Axial, points 7.5
8.5
Stiffness to Weight: Bending, points 23
14
Thermal Diffusivity, mm2/s 43
180