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