Zamak 7

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:  BrinellModulus of Elasticity:  psi x 10^6
41 (283)32 (221)138012.4

Typical Physical Properties
Density:  lb/in^3 (g/cc)Melt Range:  deg F (deg C)Electrical Conduct: %IACSSpecific Heat:  BTU/lb/deg FDie Shrinkage: in/in
0.240 (6.6)718-728 (381-387)270.100.007

Chemical Analysis
 AlMgCuFePbCdSnNiZn
Ingot (ASTM B240)3.9-4.3.010-.020.10 max0.35 max.003 max.002 max.001 max.005-.020balance
Die Cast (ASTM B86)3.7-4.3.005-.020.1 max.05 max.003 max.002 max.001 max.005-.020balance

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For additional properties of Zamak 7 and other zinc die casting alloys, please visit our technical library.