Genesis Alloy 4 (GZ4)
Alloy 4 was developed in Asia. It has a copper level midway between Alloy 3 & 5. It has been found to reduce the effects of die soldering that occurs in some castings when made from Alloy 3, but still retains ductility similar to Alloy 3.
 
Typical Compositions of GZ4
Element   Percentage (%)
Aluminum (Al)   4.1
Magnesium (Mg)   0.045
Copper (Cu)   0.4
Lead (Pb)   0.002
Cadmium (Cd)   0.001
Tin (Sn)   < 0.001
Iron (Fe)   0.002
Nickel (Ni)   < 0.001
Silicon (Si)   0.005
Indium (In)   < 0.0005
Thallium (Tl)   < 0.001
Zinc (Zn)   Balance
 
Chemical Specifications of GZ4
Element   Min(%)   Max(%)
Aluminum (Al)   3.9   4.2
Magnesium (Mg)   0.04   0.05
Copper (Cu)   0.3   0.4
Lead (Pb)   --   0.003
Cadmium (Cd)   --   0.002
Tin (Sn)   --   0.001
Iron (Fe)   --   0.020
Nickel (Ni)   --   0.001
Silicon (Si)   --   0.02
Indium (In)   --   0.0005
Thallium (Tl)   --   0.001
Zinc (Zn)   --   Balance
 
Physical Specification
      Slab   Bundle
  Grade Stamp   GZ4   --
  Mass (nominal)   10kg   1120kg
  Dimensions in mm (nominal)   480 x 109 x 36   960 x 436 x 540
  Pack Size   --   112