Zamak 7 (ASTM AG40B, Z33523, Mazak 7) Zinc Alloy
Zamak 7 is a zinc-aluminum alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. AG40B is the ASTM designation for this material. Z33523 is the UNS number. And Zamak 7 is the common industry name.
The graph bars on the material properties cards below compare Zamak 7 to: zinc-aluminums (top), all zinc alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Brinell Hardness
80
Compressive (Crushing) Strength
410 MPa 60 x 103 psi
Elastic (Young's, Tensile) Modulus
86 GPa 13 x 106 psi
Elongation at Break
13 %
Fatigue Strength
47 MPa 6.8 x 103 psi
Knoop Hardness
99
Poisson's Ratio
0.25
Shear Modulus
33 GPa 4.8 x 106 psi
Shear Strength
210 MPa 31 x 103 psi
Tensile Strength: Ultimate (UTS)
280 MPa 41 x 103 psi
Tensile Strength: Yield (Proof)
250 MPa 37 x 103 psi
Thermal Properties
Latent Heat of Fusion
120 J/g
Maximum Temperature: Mechanical
95 °C 200 °F
Melting Completion (Liquidus)
390 °C 730 °F
Melting Onset (Solidus)
380 °C 720 °F
Solidification (Pattern Maker's) Shrinkage
1.2 %
Specific Heat Capacity
410 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
110 W/m-K 65 BTU/h-ft-°F
Thermal Expansion
27 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
27 % IACS
Electrical Conductivity: Equal Weight (Specific)
38 % IACS
Otherwise Unclassified Properties
Base Metal Price
11 % relative
Density
6.4 g/cm3 400 lb/ft3
Embodied Carbon
3.0 kg CO2/kg material
Embodied Energy
57 MJ/kg 25 x 103 BTU/lb
Embodied Water
380 L/kg 45 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
36 MJ/m3
Resilience: Unit (Modulus of Resilience)
370 kJ/m3
Stiffness to Weight: Axial
7.5 points
Stiffness to Weight: Bending
23 points
Strength to Weight: Axial
12 points
Strength to Weight: Bending
15 points
Thermal Diffusivity
43 mm2/s
Thermal Shock Resistance
8.6 points
Alloy Composition
| Zn | 95.3 to 96.5 | |
| Al | 3.5 to 4.3 | |
| Cu | 0 to 0.25 | |
| Fe | 0 to 0.075 | |
| Ni | 0.0050 to 0.020 | |
| Mg | 0.0050 to 0.020 | |
| Pb | 0 to 0.0030 | |
| Cd | 0 to 0.0020 | |
| Sn | 0 to 0.0010 |
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
Corrosion Resistance of Zinc and Zinc Alloys, Frank C. Porter, 1994
Zinc Handbook: Properties, Processing, and Use In Design, Frank C. Porter, 1991
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993