Zamak 3 (Zinc Alloy / Zamak-3)

Zamak 3 (also known as ZAMAK 3 or Alloy 3) is the most widely used die-casting zinc alloy in the world. Part of the Zamak family of zinc-aluminum-magnesium-copper alloys, Zamak 3 contains approximately 4% aluminum, 0.04% magnesium, and trace amounts of copper, with the balance being zinc. It offers an exceptional combination of excellent castability, high dimensional stability, good mechanical properties, and outstanding surface finish straight from the mold — making it the default choice for precision die-cast components across automotive, consumer electronics, hardware, and general industrial sectors.

Mechanical Properties

• Density: 7.85 g/cm³
• Tensile Strength: 1250 MPa
• Yield Strength: 1100 MPa
• Elongation at Break: 10%
• Reduction of Area: 30%
• Hardness: HRC 48–54 (heat-treated, working condition)
• Modulus of Elasticity: 200 GPa

Note: Mechanical values shown are for as-die-cast condition. Values may vary slightly depending on casting parameters and section thickness.

Advantages

✔ Outstanding Castability — Excellent fluidity fills thin-wall sections (down to 0.5 mm); low melting point reduces energy costs and extends die life significantly

✔ Superior Surface Finish — As-cast surfaces achieve smoothness comparable to machined parts (Ra ~1–2 µm); ideal for visible/Class-A cosmetic applications

✔ High Dimensional Accuracy — Tight tolerances achievable directly from the die (±0.05–0.10 mm typical); minimizes secondary machining operations

✔ Excellent Electromagnetic Shielding — Zinc's density and conductivity provide effective EMI/RFI shielding for electronic enclosures

✔ Fast Production Cycle Times — Rapid solidification enables short cycle times (15–30 seconds typical); highly economical for high-volume production

Machining & Manufacturing

Common Applications