Grade Zamak 3

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties


Grade Zamak 3 alloy is the most widely used zinc alloy in the zinc die casting industry. It has excellent physical and mechanical properties, good castability and long term dimensional stability. It also offers excellent finishing characteristics for chromate treatments, painting and plating.

The following section will provide an overview of grade zamak 3 alloy.

Chemical Composition

The chemical composition of grade zamak 3 alloy is outlined in the following table.

Element Content (%)
Aluminum, Al 3.8-4.2
Copper, Cu 2.7-3.3
Magnesium, Mg 0.035-0.06
Iron, Fe 0.02
Silicon, Si 0.02
Lead, Pb 0.003
Cadmium, Cd 0.003
Tin, Sn 0.001
Nickel, Ni 0.001

Physical Properties

The following table shows the physical properties of grade zamak 3 alloy.

Properties Metric Imperial
Density 6.6 g/cm3 0.24 lb/in3
Melting point 381-387°C 718-728°F

Mechanical Properties

The mechanical properties of grade zamak 3 alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength 268 MPa 38900 psi
Yield strength 208 MPa 30200 psi
Modulus of elasticity 96 GPa 14000000 psi
Poisson’s ratio 0.27 0.27
Elongation at break 10% 10%
Brinell hardness 82 82

Thermal Properties

The thermal properties of grade zamak 3 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@100-200°C/68-212°F) 27.4 µm/m°C 15.2 µin/in°F
Thermal conductivity 113 W/mK 65.3².°F


The following are the list of applications of grade zamak 3 alloy:

  • Plumbing fittings
  • Zippers
  • Automotive parts
  • Ceiling fans
  • Blenders

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