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Zamak

Zamak 4 / ZL-4

Zamak 4 was developed for the Asian markets to reduce the effects of die soldering while maintaining the ductility of zamak 3. This was achieved by using half the amount of copper from the zamak 5 composition

When compared to Zamak 3, the mold sticking problem is improved and the flexibility remains unchanged. It is commonly used to produce clothing accessory such as zipper pulls and zipper sliders.

Zamak 4 was developed for the Asian markets to reduce the effects of die soldering while maintaining the ductility of zamak 3

• High strength-to-weight ratio and good ductility
• Better in mold adhesion problems encountered with Zamak 3
• Good performance on clothing accessories such as zipper sliders and zipper pulls

Zamak 4 Chemical Analysis

Analysis  ( %) Zamak 4 / ZL-4
Al 3.9 – 4.3
Cu 0.3 – 0.5
Mg 0.03 – 0.06
Pb ≤0.003
Fe ≤0.02
Cd ≤0.002
Sn ≤0.002
Si ≤0.02
Ni ≤0.001

Zamak 4 General Mechanical Properties

Mechanical Properties Metric Value
Ultimate Tensile Strength 317 MPa
Yield Strength (0.2% offset) 221—269 MPa
Impact Strength 61 J (7 J aged)
Elongation 7%
Shear Strength 214—262 MPa
Compressive Yield Strength 414—600 MPa
Fatigue Strength (reverse bending 5×108cycles) 48—57 MPa
Hardness 91 Brinell

Zamak 4 General Physical Properties

Physical Properties Metric Value
Solidification Range (melting range) 380—386 °C
Density 6.6 g/cm3
Coefficient of Thermal Expansion 27.4 μm/m-°C
Thermal Conductivity 108.9—113.0 W/m-K @ 100 °C
Electrical Conductivity 26-27% IACS
Specific Heat Capacity 418.7 J/kg-°C
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