Introduction
Choosing between zamak and aluminum is one of the most common decisions — and with the greatest impact on cost and performance — when designing a metal part. Both are versatile materials, but they respond to different needs: while zamak stands out in precision, cost per piece and medium-high series, aluminum gains ground when weight is critical.
At Funmak, we’ve been manufacturing zamak parts using die casting since 1992. In this guide, we compare both materials using objective criteria—including where aluminum is the better option—so you can make an informed decision based on facts, not assumptions.
Zamak vs Aluminum: Comparative Table
| Criterion | Zamak | Aluminum |
|---|---|---|
| Density / weight | Denser (~6,6 g/cm³) → heavier parts | Lighter (~2,7 g/cm³) → better when weight is critical |
| Melting point | Low (~380-390 °C) → faster injection cycles and more economical molds | High (~660 °C) → higher energy and tooling costs |
| Dimensional accuracy | Excellent for small and complex parts, very tight tolerances | Good, although generally with slightly wider tolerances in die casting |
| Mechanical resistance | High compressive strength and good performance in small to medium-sized parts | Improved strength-to-weight ratio in large parts |
| Corrosion resistance | Good as a base; excellent with finishes such as chrome plating or paint | Naturally good thanks to its oxide layer |
| Production cost (medium-high production runs) | Very competitive: fast cycle times, more durable and economical molds | Higher costs for molds and energy, although this is offset by the higher costs for large or lightweight parts |
| Surface finishes | Excellent base for chrome plating, painting, and galvanizing | Requires specific processes (anodizing) for similar finishes |
| Recyclability | Fully recyclable | Fully recyclable |
When to choose Zamak?
Zamak is the most suitable option when the project prioritizes:
- Small or medium-sized parts with complex geometries — hardware, connectors, housings, locksmith or faucet components.
- Medium-high series — low melting point allows for fast injection cycles and longer mold life, reducing cost per part to volume.
- Very tight tolerances — sectors such as electronics or automotive where millimeter-precise fit is critical.
- Quality surface finish — parts that need chrome plating, painting or galvanizing with a good final result.
When to choose aluminum?
- When the final weight of the part is a critical factor — sectors such as aeronautics or components where every gram counts.
- Large pieces — aluminum maintains a better strength/weight ratio as the volume of the piece grows.
- Very high service temperature environments — its higher melting point gives it more leeway in applications that work near elevated temperatures.
- When there is already an anodizing chain integrated into the customer’s production process.
Zamak and Aluminum in Practice: Our Experience
At Funmak we work mainly with zamak for automotive, locksmith and electronics clients, where the combination of precision, cost and finish makes the difference compared to other materials.
There is no “best” material in absolute terms — it depends on the target weight, production volume, and tolerances of your part. As a general rule: zamak for small-medium parts with medium-high series and demanding precision; aluminum when weight is the number one priority or the piece is large.
