Zamak die casting is, in the case of metals, the shortest path between raw material and the desired part, and its applications encompass virtually all sectors.

Its main advantages respect to other alloys are:

  • Greater dimensional accuracy and achievement of stricter tolerances: Less secondary machinings.
  • Greater lasting moulds (more than six times more than aluminium and twice that of magnesium); lesser cost of maintenance and replacement of moulds.
  • Ideal disposition for galvanic coatings (cromium, brass etc), wider possibilities for finishing and presentation of parts.

Main characteristics of commercial alloy ZAMAK-5 (EN 1774)

 Zamak Chemical Composition

In accordance with the norm UNE-EN 12844

Denomination: ZP5

Parts Chemical Composition (%)
Aluminium Al 3,7   -   4,3
Magnesium Mg 0,025 - 0,06
Copper Cu 0,7   -   1,2
Iron Fe máx.  0,050
Lead Pb máx.  0,005
Cadmium Cd máx.  0,005
Tin Sn máx.  0,002
Nickel Ni máx.  0,02
Silicium Si máx.  0,03

In accordance with the norm: UNE-EN 1774

Ingots Chemical Composition (%)
Aluminium Al 3,8  -   4,2
Magnesium Mg 0,035 - 0,06
Copper Cu 0,7   -   1,1
Iron Fe máx.  0,020
Lead Pb máx.  0,003
Cadmium Cd máx.  0,003
Tin Sn máx.  0,001
Nickel Ni máx.  0,001
Silicium Si máx.  0,02

Denomination: ZnAl4Cu1 - ZL5

Physical Properties
Density at 20ºC g/cm³ 6,7
Fusion Interval ºC 380-386
Casting temperature ºC 410-430
Contraction at solidification mm/m 5
Expansion coefficient x 10-6 K-1 27,4
Fusion heat KJ/kg 105
Specific heat J/kg x K 419
Thermal conductivity W/m x K 108
Electrical conductivity %IACS 26
Mechanical Properties for hot chamber cast parts
Tensile Strength N/mm² 280-350
Elongation % 3 - 8
Brinell hardness   85 - 105
Impact resistance J 65

(Charpy 6,35 x 6,35 unnotched)

* These properties given are for information purposes only and differ depending on the sape of the part and casting parameters.

Salt Spray resistence
The required resistence can be obtained with a corresponding thickness of the coating, and its cost would be proportional.
BICHROMATE Usually from 120 to 200 hours
CROMIUM From 400 to 1000 hours