Zamak 2 (ASTM AC43A, Z35541, Mazak 2) Zinc Alloy

Zamak 2 is an alloy of zinc, further classified as a zinc-aluminum. It is typically furnished in the as-fabricated (no temper or treatment) condition. AC43A is the ASTM designation for this material. Z35541 is the UNS number. And Zamak 2 is the industry name.

Material Properties

Base Metal Price19 % rel

Compressive (Crushing) Strength640 MPa (93 x 103 psi)

Density7.0 g/cm3 (440 lb/ft3)

Elastic (Young's, Tensile) Modulus98 GPa (14 x 106 psi)

Electrical Conductivity25 % IACS

Electrical Resistivity Order of Magnitude-7 10x Ω-m

Elongation at Break7.0 %

Fatigue Strength (Endurance Limit)59 MPa (8.6 x 103 psi)

Knoop Hardness130

Melting Onset (Solidus)380 °C (720 °F)

Poisson's Ratio0.26

Rockwell B Hardness63

Shear Modulus33 GPa (4.8 x 106 psi)

Shear Strength320 MPa (46 x 103 psi)

Solidification (Pattern Maker's) Shrinkage1.3 %

Specific Heat Capacity420 J/kg-K

Strength to Weight Ratio51 kN-m/kg

Tensile Strength: Ultimate (UTS)360 MPa (52 x 103 psi)

Thermal Conductivity100 W/m-K

Thermal Diffusivity34

Thermal Expansion28 µm/m-K

Alloy Composition

Zinc (Zn)92.5 to 94 %

Aluminum (Al)3.5 to 4.3 %

Copper (Cu)2.5 to 3.0 %

Iron (Fe)0 to 0.1 %

Magnesium (Mg)0.020 to 0.050 %

Lead (Pb)0 to 0.0050 %

Cadmium (Cd)0 to 0.0040 %

Tin (Sn)0 to 0.0030 %

Further Reading

ASTM B86: Standard Specification for Zinc and Zinc-Aluminum (ZA) Alloy Foundry and Die Castings

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993

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