ZP 3 Zinc Die Casting Alloy (UNS Z35521, Z33520)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Other Designations


Die cast alloys have a variety of uses and zinc casting alloys are much stronger than reinforced molded polymers. The hardness, dimensional stability, self lubrication and high modulus of zinc metal are incorporated in its alloys. Zinc also exhibits good thermal and electrical conductivity. Zinc can be cast easily at moderate temperatures as the casting tolerances are precise.

These alloys are die cast in a hot chamber according to the European Standard – EN12844 and ZP3 and ZP5 are most widely used. These alloys are mainly composed of aluminum and zinc. The alloy number used to designate ZP3 alloy is ZP0400.

This datasheet will look into the chemical composition, properties and applications of zinc die casting alloy – ZP3.

Chemical Composition

The chemical composition of zinc die casting alloy – ZP3 is given in the following table.

Element Content (%)
Zinc, Zn Remainder
Aluminum, Al 4.3-3.7
Copper, Cu 0.1
Magnesium, Mg 0.05-0.025
Iron, Fe 0.05
Silicon, Si 0.03
Nickel, Ni 0.02
Lead, Pb 0.005
Cadmium, Cd 0.005
Tin, Sn 0.002

Physical Properties

The following table discusses the physical properties of zinc die casting alloy- ZP3.

Properties Metric Imperial
Density 6.6 gm/cm3 0.24 lb/in3

Mechanical Properties

The mechanical properties of zinc die casting alloy – ZP3 are tabulated below.

Properties Metric Imperial
Tensile strength 308 MPa 44.6 ksi
Yield strength 268 MPa 38.8 ksi
Elongation at Break 5.80% 5.80%
Poissons Ratio 0.29 0.29

Other Designations

Some of the designations used to denote zinc die casting alloy –ZP3 are listed below:

  • UNS Z33520
  • SAE903
  • ASTM B240/ASTM B669 – AG41A


The zinc die casting alloy – ZP3 is used in the following applications:

  • Door, window and bath fittings
  • Office equipment
  • Automotive equipment
  • Electronic components.

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