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Die Casting

Zamak 3

Zamak 3

Zamak 3, or Zinc Alloy 3, is usually the first choice when considering zinc for die casting. It is the most widely used zinc alloy in North America. Its excellent balance of desirable physical and mechanical properties, superb castability and long-term dimensional stability are the reasons why most die castings are made from this alloy. Zamak 3 also offers excellent finishing characteristics for plating, painting and chromate treatments. In terms of die casting, it is the standard by which other zinc alloys are rated. Where higher strength is required, consider the other zinc alloys.

The behavior of zinc alloys under stress is non-linear and time-temperature dependent on strain-rate, i.e. the ratio of stress to strain is not constant, even at low stresses, and varies with time resulting in continuous plastic flow under constant applied load. Designers of structural components should be aware of the creep limitations of zinc alloys, which do not have a single value for elastic modulus. Yield strength (allowable stress) under sustained loading is dependent on the allowable design strain (% elongation) over the required service life. Working values for the elastic modulus and yield strength are important for design purposes.

This alloy exhibits excellent damping capacity and vibration attenuation in comparison with aluminum diecasting alloys.

Material Alloy Tensile Strength Yield Strength
(0.2% Offset)
Impact Strength Shear Strength Hardness Elongation
MPa psi MPa psi J ft. lb. MPa psi Brinell % in 50mm
Zinc Zamak 3 283 41 221 32 58 43 214 31 82 10

= Bar Chart

Material Alloy Density Melting Range Thermal
Conductivity
Coefficient of
Thermal Expansion
Electrical
Conductivity
g/cm3 lb/in3 W/m · K Btu-ft/h-ft °F µm/m°K µin/in°F x 10^-6 % IACS
Zinc Zamak 3 6.6 0.24 381-387 718-728 113 66.5 27.4 15.2 27

= Bar Chart

Material Percentage (%)
Zinc Zamak 3 Aluminum 3.5-4.3,
Copper 0.25 max
Magnesium 0.02-0.05
Iron 0.1 max
Lead 0.005 max
Cadmium 0.004 max
Tin 0.003 max
Zinc Remainder