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Zamak 2 / ZL0430 / ZnAl4Cu3

Zamak 2 has the greatest strength out of all the zamak alloys. Over time it retains its strength and hardness better than the other alloys; however, it becomes more brittle, shrinks, and less elastic.

Zamak 2 is also known as Kirksite when gravity cast for use as a die. It was originally designed for low volume sheet metal dies. It later gained popularity for making short run injection molding dies. It is also less commonly used for non-sparking tools and mandrels for metal spinning.

Zamak 2 is the highest strength and hardness of the Zamak family. This alloy has excellent casting characteristics including:

Zamak 2 has the same composition as zamak 3 with the addition of 3% copper in order to increase strength by 20%, which also increases the price.

• A higher creep performance than other zamak alloys
• Excellent damping capacity and vibration attenuation in comparison to aluminum die cast alloys
• High strength and hardness levels after long-term aging

Zamak 2 (EN1774 European Standard) Chemical Analysis

Analysis (EN1774) ( %) Zamak 2 / ZL0430 / ZnAl4Cu3
Al 3.8 – 4.2
Cu 2.7 – 3.3
Mg 0.035 – 0.06
Pb ≤0.003
Fe ≤0.02
Cd ≤0.003
Sn ≤0.001
Si ≤0.02
Ni ≤0.001

Zamak 2 General Mechanical Properties

Mechanical Properties Metric Value
Ultimate Tensile Strength 397 MPa (331 MPa aged)
Yield Strength 361 MPa
Impact Strength 38 J (7 J aged)
Elongation at Fmax 3% (2% aged)
Elongation at Fracture 6%
Shear Strength 317 MPa
Compressive Yield Strength 641 MPa
Fatigue Strength (reverse bending 5×108cycles) 59 MPa
Hardness 130 Brinell (98 Brinell aged)
Modulus of Elasticity 96 GPa

Zamak 2 General Physical Properties

Physical Properties Metric Value
Solidification Range (melting range) 379—390 °C
Density 6.8 kg/dm3
Coefficient of Thermal Expansion 27.8 μm/m-°C
Thermal Conductivity 105 W/mK
Electrical Resistivity 6.85 μΩ-cm at 20 °C
Latent Heat (heat of fusion) 110 J/g
Specific Heat Capacity 419 J/kg-°C
Coefficient of Friction 0.08
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