Zamak 7 is a modification of Zamak 3 in which lower magnesium content is specified to improve fluidity. To avoid problems with intergranular corrosion, lower levels of impurities are required and a small amount of nickel is specified. Zamak 7 also has slightly better ductility than Zamak 3 with other properties remining relatively equal. It is a popular choice for those special cases where the die caster is making thin walled components requiring a good surface finish. However, research has shown that metal and die termperatures have a greater effect than changing alloys. Close attention to control of the die casting process is important so as to eliminate defects and achieve a consistent quality.
Typical Mechanical Properties
| UTS: ksi (MPa) | Yield Strength: ksi (MPa) | Elongation: % | Hardness: Brinell | Modulus of Elasticity: psi x 10^6 |
| 41 (283) | 32 (221) | 13 | 80 | 12.4 |
Typical Physical Properties
| Density: lb/in^3 (g/cc) | Melt Range: deg F (deg C) | Electrical Conduct: %IACS | Specific Heat: BTU/lb/deg F | Die Shrinkage: in/in |
| 0.240 (6.6) | 718-728 (381-387) | 27 | 0.10 | 0.007 |
Chemical Analysis
| | Al | Mg | Cu | Fe | Pb | Cd | Sn | Ni | Zn |
| Ingot (ASTM B240) | 3.9-4.3 | .010-.020 | .10 max | 0.035 max | .003 max | .002 max | .001 max | .005-.020 | balance |
| Die Cast (ASTM B86) | 3.7-4.3 | .005-.020 | .1 max | .05 max | .003 max | .002 max | .001 max | .005-.020 | balance |
Recommended Downloads
For additional properties of Zamak 7 and other zinc die casting alloys, please visit our technical library.
