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ASTM B522 Class II vs. Zamak 7

ASTM B522 class II belongs to the otherwise unclassified metals classification, while Zamak 7 belongs to the zinc alloys. There are 23 material properties with values for both materials. Properties with values for just one material (11, 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 B522 class II and the bottom bar is Zamak 7.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 96
86
Elongation at Break, % 1.1 to 28
13
Knoop Hardness 88 to 150
99
Poisson's Ratio 0.41
0.25
Shear Modulus, GPa 34
33
Shear Strength, MPa 180 to 280
210
Tensile Strength: Ultimate (UTS), MPa 280 to 490
280
Tensile Strength: Yield (Proof), MPa 120 to 210
250

Thermal Properties

Latent Heat of Fusion, J/g 77
120
Melting Completion (Liquidus), °C 1030
390
Melting Onset (Solidus), °C 1030
380
Specific Heat Capacity, J/kg-K 160
410
Thermal Expansion, µm/m-K 15
27

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
27
Electrical Conductivity: Equal Weight (Specific), % IACS 5.7
38

Otherwise Unclassified Properties

Density, g/cm3 17
6.4

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.4 to 63
36
Resilience: Unit (Modulus of Resilience), kJ/m3 75 to 230
370
Stiffness to Weight: Axial, points 3.1
7.5
Stiffness to Weight: Bending, points 8.9
23
Strength to Weight: Axial, points 4.4 to 7.8
12
Strength to Weight: Bending, points 5.5 to 8.0
15
Thermal Shock Resistance, points 13 to 24
8.6

Alloy Composition


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Aluminum (Al), % 0
3.5 to 4.3
Cadmium (Cd), % 0
0 to 0.0020
Copper (Cu), % 0
0 to 0.25
Gold (Au), % 68.5 to 69.5
0
Iron (Fe), % 0
0 to 0.075
Lead (Pb), % 0
0 to 0.0030
Magnesium (Mg), % 0
0.0050 to 0.020
Nickel (Ni), % 0
0.0050 to 0.020
Platinum (Pt), % 5.5 to 6.5
0
Silver (Ag), % 24.5 to 25.5
0
Sulfur (S), % 0 to 0.010
0
Tin (Sn), % 0
0 to 0.0010
Zinc (Zn), % 0
95.3 to 96.5
Residuals, % 0 to 0.26
0