Zamak 3
Zamak 3 is the de facto standard for the zamak series of zinc alloys; all other zinc alloys are compared to this. Zamak 3 has the base composition for the zamak alloys (96% zinc, 4% aluminium). It has excellent castability and long term dimensional stability. More than 70% of all North American zinc die castings are made from zamak 3.
| Alloying elements | Impurities | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Standard | Limit | Al | Cu† | Mg | Pb | Cd | Sn | Fe | Ni | Si | In | Tl |
| ASTM B240 (Ingot) | min | 3.9 | - | 0.025 | - | - | - | - | - | - | - | - |
| max | 4.3 | 0.1 | 0.05 | 0.004 | 0.003 | 0.002 | 0.075 | - | - | - | - | |
| ASTM B86 (Cast) | min | 3.5 | - | 0.025 | - | - | - | - | - | - | - | - |
| max | 4.3 | 0.25 | 0.05 | 0.005 | 0.004 | 0.003 | 0.1 | - | - | - | - | |
| EN1774 (Ingot) | min | 3.8 | - | 0.035 | - | - | - | - | - | - | - | - |
| max | 4.2 | 0.03 | 0.06 | 0.003 | 0.003 | 0.001 | 0.02 | 0.001 | 0.02 | - | - | |
| EN12844 (Cast) | min | 3.7 | - | 0.025 | - | - | - | - | - | - | - | - |
| max | 4.3 | 0.1 | 0.06 | 0.005 | 0.005 | 0.002 | 0.05 | 0.02 | 0.03 | - | - | |
| JIS H2201 (Ingot) | min | 3.9 | - | 0.03 | - | - | - | - | - | - | - | - |
| max | 4.3 | 0.03 | 0.06 | 0.003 | 0.002 | 0.001 | 0.075 | - | - | - | - | |
| JIS H5301 (Cast) | min | 3.5 | - | 0.02 | - | - | - | - | - | - | - | - |
| max | 4.3 | 0.25 | 0.06 | 0.005 | 0.004 | 0.003 | 0.01 | - | - | - | - | |
| AS1881 | min | 3.9 | - | 0.04 | - | - | - | - | - | - | - | - |
| max | 4.3 | 0.03 | 0.06 | 0.003 | 0.003 | 0.001 | 0.05 | - | 0.001 | 0.0005 | 0.001 | |
| GB8738-88 | min | 3.9 | - | 0.03 | - | - | - | - | - | - | - | - |
| max | 4.3 | 0.1 | 0.06 | 0.004 | 0.003 | 0.0015 | 0.035 | - | - | - | - | |
| †Impurity | ||||||||||||
| Property | Metric value | English value |
|---|---|---|
| Mechanical properties | ||
| Ultimate tensile strength | 268 MPa | 38,900 psi |
| Yield strength (0.2% offset) | 208 MPa | 30,200 psi |
| Impact strength | 46 J (56 J aged) | 34 ft-lbf (41 ft-lbf aged) |
| Elongation at Fmax | 3% | |
| Elongation at fracture | 6.3% (16% aged) | |
| Shear strength | 214 MPa | 31,000 psi |
| Compressive yield strength | 414 MPa | 60,000 psi |
| Fatigue strength (reverse bending 5x108 cycles) | 48 MPa | 7,000 psi |
| Hardness | 97 Brinell | |
| Modulus of elasticity | 96 GPa | 14,000,000 psi |
| Physical properties | ||
| Solidification range (melting range) | 381—387 °C | 718—729 °F |
| Density | 6.7 g/cm3 | 0.24 lb/in3 |
| Coefficient of thermal expansion | 27.4 μm/m-°C | 15.2 μin/in-°F |
| Thermal conductivity | 113 W/mK | 784 BTU-in/hr-ft2-°F |
| Electrical resistivity | 6.37 μΩ-cm at 20 °C | 2.51 μΩ-in at 68 °F |
| Latent heat (heat of fusion) | 110 J/g | 4.7x10−5 BTU/lb |
| Specific heat capacity | 419 J/kg-°C | 0.100 BTU/lb-°F |
| Coefficient of friction | 0.07 | |
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