Zinc-Aluminum 27 (ZA-27, Z35841)

ZA-27 is an alloy of zinc, further classified as a zinc-aluminum. Z35841 is the UNS number for this material. ZA-27 is the industry name.

It has three common variants, each represented as a separate material. The Material Properties section below shows ranges encompassing all variants. For more specific values, follow the links in the Variant Materials section.

Material Properties

Base Metal Price19 % rel

Brinell Hardness100 to 120

Compressive (Crushing) Strength260 to 370 MPa (38 to 54 x 103 psi)

Density5.0 g/cm3 (310 lb/ft3)

Elastic (Young's, Tensile) Modulus78 GPa (11 x 106 psi)

Electrical Conductivity30 % IACS

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

Elongation at Break2.0 to 4.5 %

Fatigue Strength (Endurance Limit)110 to 170 MPa (16 to 25 x 103 psi)

Fracture Toughness20 to 24 MPa-m1/2

Knoop Hardness120 to 140

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

Modulus of Resilience (Unit Resilience)430 to 880 kJ/m3

Poisson's Ratio0.27

Rockwell B Hardness60 to 72

Shear Modulus30 GPa (4.4 x 106 psi)

Shear Strength230 to 330 MPa (33 to 48 x 103 psi)

Solidification (Pattern Maker's) Shrinkage1.3 %

Specific Heat Capacity530 J/kg-K

Strength to Weight Ratio80 to 86 kN-m/kg

Tensile Strength: Ultimate (UTS)400 to 430 MPa (58 to 62 x 103 psi)

Tensile Strength: Yield (Proof)260 to 370 MPa (38 to 54 x 103 psi)

Thermal Conductivity130 W/m-K

Thermal Diffusivity49 m2/s

Thermal Expansion26 µm/m-K

Unit Rupture Work (Ultimate Resilience)7.1 to 7.8 MJ/m3

The length of each bar compares the given value to the highest value in the database.

Alloy Composition

Zinc (Zn)69.4 to 73 %

Aluminum (Al)25 to 28 %

Copper (Cu)2.0 to 2.5 %

Iron (Fe)0 to 0.075 %

Magnesium (Mg)0.010 to 0.020 %

Cadmium (Cd)0 to 0.0060 %

Lead (Pb)0 to 0.0060 %

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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