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Zamak 7 vs. Zamak 5

Both Zamak 7 and Zamak 5 are zinc alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. Their average alloy composition is basically identical. There are 34 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is Zamak 7 and the bottom bar is Zamak 5.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 80
92
Compressive (Crushing) Strength, MPa 410
600
Elastic (Young's, Tensile) Modulus, GPa 86
87
Elongation at Break, % 13
6.3
Fatigue Strength, MPa 47
56
Knoop Hardness 99
120
Poisson's Ratio 0.25
0.25
Shear Modulus, GPa 33
33
Shear Strength, MPa 210
260
Tensile Strength: Ultimate (UTS), MPa 280
330
Tensile Strength: Yield (Proof), MPa 250
240

Thermal Properties

Latent Heat of Fusion, J/g 120
120
Maximum Temperature: Mechanical, °C 95
95
Melting Completion (Liquidus), °C 390
390
Melting Onset (Solidus), °C 380
380
Solidification (Pattern Maker's) Shrinkage, % 1.2
1.2
Specific Heat Capacity, J/kg-K 410
410
Thermal Conductivity, W/m-K 110
110
Thermal Expansion, µm/m-K 27
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 27
26
Electrical Conductivity: Equal Weight (Specific), % IACS 38
37

Otherwise Unclassified Properties

Base Metal Price, % relative 11
12
Density, g/cm3 6.4
6.4
Embodied Carbon, kg CO2/kg material 3.0
3.0
Embodied Energy, MJ/kg 57
57
Embodied Water, L/kg 380
380

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 36
19
Resilience: Unit (Modulus of Resilience), kJ/m3 370
330
Stiffness to Weight: Axial, points 7.5
7.5
Stiffness to Weight: Bending, points 23
23
Strength to Weight: Axial, points 12
14
Strength to Weight: Bending, points 15
16
Thermal Diffusivity, mm2/s 43
42
Thermal Shock Resistance, points 8.6
9.9

Alloy Composition

Aluminum (Al), % 3.5 to 4.3
3.5 to 4.3
Cadmium (Cd), % 0 to 0.0020
0 to 0.0050
Copper (Cu), % 0 to 0.25
0.7 to 1.3
Iron (Fe), % 0 to 0.075
0 to 0.1
Lead (Pb), % 0 to 0.0030
0 to 0.0050
Magnesium (Mg), % 0.0050 to 0.020
0.025 to 0.080
Nickel (Ni), % 0.0050 to 0.020
0 to 0.020
Silicon (Si), % 0
0 to 0.030
Tin (Sn), % 0 to 0.0010
0 to 0.0030
Zinc (Zn), % 95.3 to 96.5
94.3 to 95.7