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

Zamak 2 is a zinc-aluminum alloy. 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. It has the lowest electrical conductivity and a moderately high tensile strength relative to other zinc alloys.

Mechanical Properties

Graph bars compare Zamak 2 to other materials. From top to bottom: zinc-aluminum, zinc alloys, and the entire database.

Brinell Hardness

100

Compressive (Crushing) Strength

640 MPa 93 x 103 psi

Elastic (Young's, Tensile) Modulus

92 GPa 13 x 106 psi

Elongation at Break

6.0 %

Fatigue Strength (Endurance Limit)

59 MPa 8.6 x 103 psi

Knoop Hardness

130

Modulus of Resilience (Unit Resilience)

400 kJ/m3

Poisson's Ratio

0.26

Rockwell B Hardness

63

Shear Modulus

33 GPa 4.8 x 106 psi

Shear Strength

320 MPa 46 x 103 psi

Strength to Weight Ratio

51 kN-m/kg

Tensile Strength: Ultimate (UTS)

360 MPa 52 x 103 psi

Tensile Strength: Yield (Proof)

270 MPa 39 x 103 psi

Unit Rupture Work (Ultimate Resilience)

20 MJ/m3

Thermal Properties

Melting Onset (Solidus)

380 °C 710 °F

Solidification (Pattern Maker's) Shrinkage

1.3 %

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

110 W/m-K 63 BTU/h-ft-°F

Thermal Diffusivity

38 m2/s

Thermal Expansion

28 µm/m-K

Other Material Properties

Base Metal Price

20 % relative

Density

7.0 g/cm3 440 lb/ft3

Electrical Conductivity: Equal Volume

25 % IACS

Electrical Conductivity: Equal Weight (Specific)

32 % IACS

Electrical Resistivity Order of Magnitude

-7.0 10x Ω-m

Embodied Carbon

3.0 kg CO2/kg material

Embodied Energy

57 MJ/kg 24 x 103 BTU/lb

Embodied Water

380 L/kg 45 gal/lb

Alloy Composition

Zinc (Zn) 92.2 to 94
Aluminum (Al) 3.5 to 4.3
Copper (Cu) 2.5 to 3.3
Iron (Fe) 0 to 0.1
Magnesium (Mg) 0.020 to 0.060
Silicon (Si) 0 to 0.030
Nickel (Ni) 0 to 0.020
Lead (Pb) 0 to 0.0050
Cadmium (Cd) 0 to 0.0050
Tin (Sn) 0 to 0.0030

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

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

EN 12844: Zinc and zinc alloys - Castings - Specifications

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