What is Zamak?

ZAMAK is a family of alloys which has a base metal of zinc and alloying element of aluminum;magnesium and copper. New Jersey in 1929 invented zamak alloy. ZAMAK is an abbreviation of German name for the metals of which the alloys are composed: Zink (Zink) Aluminium Magnesium and Kupfer copper alloys. These alloys (especially #3s and #5) are often used for the Die Casting industry.

Difference between zamak 5 and zamak 3

Zamak 3 and Zamak 5 Chemical Composition

ElementZamak 3 Content(%)Zamak 5 Content(%)
Aluminum, Al3.5-4.33.5-4.3
Copper, Cu0.250.75-1.25
Magnesium, Mg0.02-0.050.02-0.05
Iron, Fe0.10.1
Lead, Pb0.0050.005
Cadmium, Cd0.0040.004
Tin, Sn0.0030.003

Zamak 3 and Zamak 5 Physical Properties

Density6.6 g/cm30.24 lb/in3
Melting point380-386°C717-727°F

Mechanical Properties

Zamak 3 alloy

Tensile strength268 MPa38900 psi
Yield strength208 MPa30200 psi
Modulus of elasticity96 GPa14000000 psi
Elongation at break10%10%
Brinell hardness8282

Zamak 5 alloy

Tensile strength331 MPa48000 psi
Yield strength295 MPa43000 psi
Modulus of elasticity96 GPa14000000 psi
Elongation at break7%7%
Brinell hardness9191

Thermal Properties

PropertiesZamak 3 MetricZamak 5 Metric
Thermal conductivity113 W/mK109 W/mK

Zamak 3 Equivalent

Zamak 3Alloy 3AG40AZDC 2ZX01Alloy AZ-A4Z400Z35520

Zinc Die Casting alloy Advantage

1. Relative specific gravity.

2. Good casting performance, can die-cast complex shape, thin-walled precision parts, smooth casting surface.

3. Surface treatment: electroplating, spraying, painting, polishing, grinding, etc.

4. No iron absorption when melting and die-casting, no corrosion of the die casting die, no sticky die.

5. have very good room temperature mechanical properties and wear resistance.

6. low melting point, melting at 385℃, easy to die-casting molding.

Zinc Die Casting Alloy Disadvantage

The most common defect of zinc alloy die casting is surface blistering.

Defects characterization: die casting surface has raised small bubbles; Mainly manifested as:

A. die-casting Parts come out of die with Porosity

B. polishing or processing revealed

C. After oil spraying or plating.

How can we reduce the disadvantages of zinc alloy die casting and improve its accuracy?

1, we have Multi-Slide and Conventional Die Casting machine. We determine the model according to the different requirements of different products.
2, we will do DFM parting in the mold design stage, and use computer-aided technology to predict the position of air bubbles and how to improve them in advance.
3. In the surface treatment stage of the product, we can strengthen the process control to improve the product yield rate.
4. With the help of CCD visual inspector, 100% full inspection, reduce the flow of defective products

Zinc Die Casting Applications

Now more and more industry are using zinc alloy material for their parts, such as in below industry.

Decoration Parts
Industry Parts
communication parts
Automotive parts
Consumer Parts

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