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 with respect to other alloys are:

  • Greater dimensional accuracy and achievement of stricter tolerances: Fewer secondary machining operations.
  • Longer lasting moulds (more than six times those for aluminium and twice those for magnesium); lower maintenance and mould replacement costs.
  • Ideal disposition for galvanic coatings (chromium, 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 standard 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 max.  0.050
Lead Pb m&max.  0.005
Cadmium Cd max.  0.005
Tin Sn max.  0.002
Nickel Ni max.  0.02
Silicon Si max.  0.03

In accordance standard 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 max.  0.020
Lead Pb max.  0.003
Cadmium Cd max.  0.003
Tin Sn max.  0.001
Nickel Ni max.  0.001
Silicon Si max.  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 resistance
The required resistance can be obtained with a corresponding thickness of the coating, and its cost would be proportional.
BICHROMATE Usually from 120 to 200 hours
CHROMIUM From 400 to 1000 hours