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Zinc Alloys
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Zamak #3
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Zamak #4
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Zamak #7
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ZA-8
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ZA-12
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ZA-27
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Mechanical Properties
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Ultimate Tensile
Strength: psi x 10³(MPa)
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41 (282.7) | 48 (328.0) | 41 (282.7 | 54 (374) | 58 (404) | 61 (425) |
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Yield Strength
-0.2% Offset: psi x 10³(MPa)
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42 (290) | 46 (320) | 53 (371) | |||
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Elongation: % in 2"
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10 | 7 | 13 | 6-10 | 4-7 | 1-3 |
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Shear strength:
psi x 10³(MPa)
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31 (213.7) | 38 (262.0) | 31 (213.7) | 40 (275) | 43 (296) | 47 (325) |
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Hardness: Brinell
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82 | 91 | 80 | 95-110 | 95-115 | 105-125 |
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Impact strength: ft-lb (J)
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43 (58.3) | 48 (65.1) | 43 (58.3) | 31 (42) | 21 (29) | 9 (5) |
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Fatigue Strength Rotary Bend - 5x10 8 cycles
psi x 10³(MPa) |
6.9 (47.6) | 6.8 (46.9) | 8.2 (56.5) | 15 (103) | 17 (117) | |
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Compressive Yield strength: 0.1% offset
psi x 10³(MPa) |
60 (413.7) | 87 (599.8) | 60 (413.7) | 37 (252) | 39 (269) | 52 (385) |
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Modules of elasticity:
psi x 10³(MPa)
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12.4 (85.5)
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12.4 (85.5) | 12.4 (85.5) | 12.4 (85.5) | 12.4 (85.5) | 11.3 (77.9) |
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Physical Properties
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Density lb/cu in (gm/cc)
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0.24 (6.6) | 0.24 (6.6) | 0.24 (6.6) | 0.227 (6.3) | 0.218 (6.0) | 0.181 (5.0) |
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Melting Range - Fahrenheit
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719-728 | 717-727 | 718-728 | 707-759 | 710-810 | 708-903 |
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Melting Range - Centigrade
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381-387 | 380-386 | 381-387 | 375-404 | 377-432 | 376-484 |
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Electrical Conductivity: % IACS
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27 | 26 | 27 | 27.7 | 28.3 | 29.7 |
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Thermal Conductivity: BTU/ft/hr/degree Fahrenheit (W/m/hr/degree Centigrade)
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65.3 (113.0) | 62.9 (108.9) | 65.3 (113.0) | 66.3 (114.7) | 67.1 (116.1) | 72.5 (125.5) |
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Coefficient of thermal expansion
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15.2 (27.4) | 15.2 (27.4) | 15.2 (27.4) | 12.9 (23.3) | 13.4 (24.2) | 14.4 (26.0) |
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Specific heat BTU/lb/degree Fahrenheit
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0.1 | .01 | .01 | 0.104 | 0.107 | 0.125 |
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Pattern shrinkage: inches/inches
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0.006 | 0.006 | 0.006 | 0.007 | 0.0075 | 0.008 |
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Chemical Specifications
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| AL | 3.5-4.3 | 3.5-4.3 | 3.5-4.3 | 8.0-8.8 | 10.5-11.5 | 25.0-28.0 |
| ZN | Balance | Balance | Balance | Balance | Balance | Balance |
| Mg | 0.02-0.05 | 0.03-0.08 | 0.005-0.020 | 0.015-0.030 | 0.015-0.030 | 0.010-0.020 |
| Cu | 0.25 max | 0.75-1.25 | 0.25 max | 0.8-1.3 | 0.5-1.25 | 2.0-2.5 |
| Fe (max) | 0.1 | 0.1 | 0.075 | 0.075 | 0.075 | 0.075 |
| Pb (max) | 0.005 | 0.005 | 0.003 | 0.006 | 0.006 | 0.006 |
| Cd (max) | 0.004 | 0.004 | 0.002 | 0.006 | 0.006 | 0.006 |
| Sn (max) | 0.003 | 0.003 | 0.001 | 0.003 | 0.003 | 0.003 |
| Ni | 0.005-0.020 | |||||
| Si | ||||||
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Industry Standard
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| ASTN | AG 40A | AC 41A | AG 40B | |||
| SAE | 903 | 925 | ||||
| UNS | Z33520 | Z35531 | Z33523 | Z35636 | Z35631 | Z35841 |
No Minimum Quantities - No Maximum Quantities