Aluminum vs Zinc Die Casting: Which to Choose (2026)
June 29, 2026
Choose aluminum die casting for lightweight, strong, structural and heat-dissipating parts; choose zinc die casting for small, intricate parts that need fine detail, thin walls, a premium plated finish, and the longest die life. Both are high-pressure die casting (HPDC) processes — the difference is the alloy, and it changes weight, strength, detail, cost, and tooling life.
Key takeaways
- Aluminum → lighter, stronger, better heat dissipation; cast on cold-chamber machines.
- Zinc → finer detail, thinner walls, superior plating, far longer die life; cast on hot-chamber machines.
- Zinc is denser/heavier than aluminum but casts more accurately and at lower temperature.
- Both need a steel die, so both suit higher volumes; for low volumes use CNC machining.
This guide compares the two most common die casting alloys so you can choose. For the process itself, see our die casting services and what is die casting.
Aluminum vs zinc die casting at a glance
| Factor | Aluminum (ADC12 / A380) | Zinc (Zamak 3 / 5) |
|---|---|---|
| Weight (density) | Light (~2.7 g/cm³) | Heavy (~6.6 g/cm³) |
| Strength / structural | High strength-to-weight | Strong, great impact resistance |
| Detail & thin walls | Good | Excellent (finest detail) |
| Process | Cold-chamber | Hot-chamber (faster) |
| Die life | Shorter (hot aluminum wears dies) | Very long |
| Finishing / plating | Anodize, powder coat, paint | Plates beautifully (chrome, etc.) |
| Heat dissipation | Excellent (heat sinks) | Moderate |
| Best for | Lightweight structural / thermal parts | Small, detailed, decorative parts |
Aluminum die casting
Aluminum is the go-to for parts where weight and strength matter — automotive housings and brackets, electronics enclosures, and heat sinks (aluminum dissipates heat well). It uses the cold-chamber process because of its high melting point, and finishes well with anodizing, powder coating, or paint. The trade-off is that hot molten aluminum is harder on the die, so die life is shorter than zinc.
Zinc die casting
Zinc shines for small, intricate parts — connectors, locks, gears, hardware, and decorative trim. Its low melting point enables the faster hot-chamber process, casts the finest detail and thinnest walls, and gives the longest die life of common alloys. Zinc also takes electroplating exceptionally well (bright chrome and other finishes). The main downside is weight: zinc is more than twice as dense as aluminum, so it is not ideal for large lightweight parts.
How to choose: aluminum or zinc
- Need light weight or heat dissipation? Choose aluminum.
- Need fine detail, thin walls, or a premium plated finish? Choose zinc.
- Need the longest tooling life / smallest parts? Choose zinc (hot-chamber).
- Need large structural parts? Choose aluminum (weight).
- Low volume or prototypes? Skip casting tooling — use CNC machining.
Frequently asked questions
Is aluminum or zinc stronger for die casting?
Why does zinc die casting have longer die life?
Which is cheaper, aluminum or zinc die casting?
Can you plate die cast parts?
Not sure which alloy fits your part? Send your CAD to Sendot Technology for a free DFM review and a quote on aluminum or zinc die casting. Request a quote.
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