Die Casting Materials Guide
Select the optimal alloy for high-volume cast parts
Die casting material selection is driven by a different set of factors than machining. Fluidity (how well molten metal fills thin walls), solidification behavior, die life, and post-casting finishing options all matter. Here's what works and why.
Key Selection Factors
Fluidity
How well the molten alloy fills thin walls and complex features in the die.
Melting Point
Lower melting point = longer die life and faster cycle times.
Dimensional Stability
Shrinkage rates and warping tendency during solidification.
Surface Finish
As-cast surface quality — some alloys come out nearly polished.
Weight
Part weight affects shipping cost, end-product performance, and user experience.
Die Life
How many shots before the die wears out — zinc is gentlest, aluminum is moderate.
Recommended Materials
The most widely used die casting alloy globally. A380 offers the best combination of castability, mechanical properties, and cost. A383/ADC12 is the Asia-Pacific standard with similar properties.
The easiest alloy to die cast. Lowest melting point (380°C vs 660°C for aluminum) means 3–5x longer die life and fastest cycle times. Excellent for small, detailed parts.
The dominant die casting aluminum in Asia. Virtually identical performance to A383. If your parts are made in Vietnam or China, you'll likely use ADC12 — and that's a good thing.
Stronger and harder than Zamak 3 with better creep resistance. Choose this when parts need higher mechanical performance or will be under sustained load.
💡 Pro Tips
- ▸ Aluminum A380 and ADC12 are functionally equivalent — don't pay extra to "convert" between specs.
- ▸ For parts under 200g with fine detail, zinc often beats aluminum on cost AND quality.
- ▸ Die life: zinc dies last 500K–1M+ shots vs 100K–200K for aluminum. Factor this into total project cost.
- ▸ Wall thickness: aluminum can go down to 1.5mm, zinc can go thinner (0.6mm) due to better fluidity.
- ▸ Post-casting: both aluminum and zinc take plating, painting, and powder coating well.
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