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Zamak 7 vs. Z21721 Zinc

Both Zamak 7 and Z21721 zinc are zinc alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 96% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.

For each property being compared, the top bar is Zamak 7 and the bottom bar is Z21721 zinc.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 86
87
Elongation at Break, % 13
40
Poisson's Ratio 0.25
0.25
Shear Modulus, GPa 33
35
Tensile Strength: Ultimate (UTS), MPa 280
150
Tensile Strength: Yield (Proof), MPa 250
120

Thermal Properties

Latent Heat of Fusion, J/g 120
110
Maximum Temperature: Mechanical, °C 95
90
Melting Completion (Liquidus), °C 390
410
Melting Onset (Solidus), °C 380
390
Specific Heat Capacity, J/kg-K 410
390
Thermal Conductivity, W/m-K 110
110
Thermal Expansion, µm/m-K 27
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
27
Electrical Conductivity: Equal Weight (Specific), % IACS 38
37

Otherwise Unclassified Properties

Base Metal Price, % relative 11
11
Density, g/cm3 6.4
6.6
Embodied Carbon, kg CO2/kg material 3.0
2.8
Embodied Energy, MJ/kg 57
53
Embodied Water, L/kg 380
340

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 36
57
Resilience: Unit (Modulus of Resilience), kJ/m3 370
88
Stiffness to Weight: Axial, points 7.5
7.3
Stiffness to Weight: Bending, points 23
22
Strength to Weight: Axial, points 12
6.4
Strength to Weight: Bending, points 15
9.6
Thermal Diffusivity, mm2/s 43
44
Thermal Shock Resistance, points 8.6
4.8

Alloy Composition

Aluminum (Al), % 3.5 to 4.3
0 to 0.0020
Cadmium (Cd), % 0 to 0.0020
0 to 0.070
Copper (Cu), % 0 to 0.25
0 to 0.0050
Iron (Fe), % 0 to 0.075
0 to 0.010
Lead (Pb), % 0 to 0.0030
0 to 1.0
Magnesium (Mg), % 0.0050 to 0.020
0
Nickel (Ni), % 0.0050 to 0.020
0
Tin (Sn), % 0 to 0.0010
0
Titanium (Ti), % 0
0 to 0.020
Zinc (Zn), % 95.3 to 96.5
98.9 to 100