Zinc Die Casting Alloys – ZP 5 (UNS Z35530, Z35531)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Other Designations


A variety of finishes can be given to zinc die cast alloys, gold, weathered brass, steel and leather are some of the finishes that can be done on zinc die cast alloys.

Zinc has a high density; hence its alloy castings are much more durable than their plastic counterparts. There are 4 main types of die cast zinc alloys, namely, ZP3, ZP5, ZP2 and ZP8. These alloys are die cast in the hot chamber in accordance with the European Standard – EN12844. ZP3 and ZP5 are most commonly used zinc die cast alloys. 

This datasheet will look into the chemical composition, properties and applications of zinc die casting alloy – ZP5.

Chemical Composition

The chemical composition of zinc die casting alloy – ZP5 is given in the following table.

Element Content (%)
Zinc, Zn Remainder
Aluminum, Al 4.3-3.7
Copper, Cu 0.7-1.2
Magnesium, Mn 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- ZP5.

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

Mechanical Properties

The mechanical properties of zinc die casting alloy – ZP5 are tabulated below.

Properties Metric Imperial
Tensile strength 331 MPa 48.6 ksi
Yield strength 295 MPa 42.7 ksi
Elongation at Break 3.40% 3.40%
Poissons Ratio 0.29 0.29

Other Designations

Some of the designations used to denote zinc die casting alloy –ZP5 are listed below:-

  • UNS Z35531
  • SAE 925
  • ASTM B240/ASTM B669 – AG41A


The zinc die casting alloy – ZP5 is used in the following:-

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

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