Zamak 3 (ASTM AG40A, Z33520, Mazak 3) Zinc Alloy

Zamak 3 is an alloy of zinc, further classified as a zinc-aluminum. It is typically furnished in the as-fabricated (no temper or treatment) condition. AG40A is the ASTM designation for this material. Z33520 is the UNS number. And Zamak 3 is the industry name.

Material Properties

Base Metal Price19 % rel

Compressive (Crushing) Strength410 MPa (59 x 103 psi)

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

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

Electrical Conductivity27 % IACS

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

Elongation at Break11 %

Fatigue Strength (Endurance Limit)48 MPa (7.0 x 103 psi)

Fracture Toughness12 MPa-m1/2

Knoop Hardness110

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

Poisson's Ratio0.25

Rockwell B Hardness50

Shear Modulus33 GPa (4.8 x 106 psi)

Shear Strength210 MPa (30 x 103 psi)

Solidification (Pattern Maker's) Shrinkage1.2 %

Specific Heat Capacity420 J/kg-K

Strength to Weight Ratio40 kN-m/kg

Tensile Strength: Ultimate (UTS)280 MPa (41 x 103 psi)

Tensile Strength: Yield (Proof)220 MPa (32 x 103 psi)

Thermal Conductivity110 W/m-K

Thermal Diffusivity37

Thermal Expansion27 µm/m-K

Alloy Composition

Zinc (Zn)95.3 to 96.5 %

Aluminum (Al)3.5 to 4.3 %

Copper (Cu)0 to 0.25 %

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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