Die-casting has a lot of uses and benefits, that’s why a lot of industries are now using zinc and aluminum alloy products through the die-casting process. Do you know the difference between zinc and aluminum alloys? You’ve come to the right place! Here at SEI Castings, we will discuss the difference between zinc and aluminum alloys. If you want to know more information, make sure to continue reading below!

Aluminum and zinc alloys are some of the most common metallic alloys used in manufacturing die-cast products.

Each alloy has unique physical and mechanical properties that help determine the strength, durability, longevity, and functionality of a product. The commonly used alloys have low melting points which make it easy to use during the die-casting process. The complexity of the component, specific wall thickness, and target precision of the product can also affect the die-casting process.

What Is The Difference Between Zinc And Aluminum Alloys?

For zinc alloys, hot-chamber die casting is used; this process is used for metals that have lower melting temperatures. For aluminum alloys, cold-chamber die casting is used because it has higher melting temperatures.


Zinc alloys usually require lower pressures and temperatures during the casting process. Zinc has a longer die life than other metals and this helps lower production costs in the process. Zinc alloys have corrosion resistance properties and produce great surface finishes after they are ejected from the die. There is no need for special treatments or coatings that can cost more money.

If you are searching for a perfect metal alloy for products that require tight tolerances and thin wall sections, the zinc alloy is the best choice for you. The element has a specific gravity 7.0 which makes it one of the heaviest metals used in the die casting process. Manufacturers commonly use zinc when creating high-volume and high-quality small die casting parts through a hot-chamber injection process.

Zinc Alloys

When zinc is used with other metals, it helps improve corrosion resistance, durability, strength, and stability. Zinc 3 is the most common zinc alloy used by manufacturers because it can be priced lower when compared to other zinc alloys. It is preferable for higher production rates and it has a better surface finish. It can also be used in producing intricate forms and complex designs with great stability.

Zinc 5 is an alternative to Zinc 3. It is commonly used for products that need an increase in tensile strength, rigidity, and lower malleability properties.

Zinc 7 is recommended for a high-volume of products that have thin walls. It has higher fluidity and it can help increase production rates in the process. Zinc alloys provide higher impact strength when compared to other metal alloys in the market. This is because zinc has low melting temperatures it is used for hot chamber casting, which has lower costs compared to the cold chamber process. Production speed is increased when the hot chamber casting is used in the manufacturing process.



Although aluminum has a higher melting temperature than zinc, it is still the most commonly used alloy in the die-casting industry. It is one of the most low-cost materials used for high-volume casting products. Die-cast aluminum alloys are quite common and can be found in various components of cars, electronics, tools, and other equipment that are used by millions of people in their daily lives.

Aluminum has a 2.7 specific gravity, which makes it a light-weight material. It is commonly used and mixed with other metals because if used on its own it can crack and shrink. Aluminum can be used with silicon, magnesium, and copper. Silicon improves the fluidity of the material and it reduces the specific gravity of the metal. It also improves corrosion prevention properties.

Aluminum alloys are lightweight, increases corrosion resistance, it also maintains its stability, and durability even when exposed to high temperatures. It also has high electrical and thermal conduction properties. It is also easier to manipulate when compared with other materials such as titanium, steel, and iron.

Aluminum Alloys

Alloy 380 is one of the most commonly used alloys in various products such as furniture, tools, automotive parts, home appliances, electronics, and other equipment. This alloy is a combination of aluminum with 8.5 percent silicon, 3.5 percent copper, and has high tensile strength which is equal to 47 kilopounds per square inch.

Alloy 383 and 384 offers higher resistance to hot cracking and helps improve die-filling characteristics when casting complex product components. Alloy 360 has higher strength even when exposed to high temperatures; it also has corrosion resistance properties.

Alloy 390 has the lowest malleability property of all aluminum alloys and has a higher resistance to corrosion and chafing and it is initially developed for automotive engine blocks.

Aluminum Alloys

Alloy 413 is used for casting complex components; it can be used for manufacturing hydraulic cylinders which provide greater pressure tightness than other alloys. Alloy 443 offers the highest malleability of all aluminum alloys. Alloy 518 has the best corrosion resistance when compared with other alloys used in the casting process.

If you need aluminum or zinc alloy die-cast products, make sure to check out SEI Castings. We can customize products according to your specifications.

Are you searching for a custom aluminum die caster that produces high-quality zinc and aluminum alloy products? You came to the right place! SEI Castings is located in Gilroy, California, USA. We are the leading custom die caster in the industry, if you need any zinc or aluminum alloy products, we can help you! Email us at sales@seimw.com, please let us know how we can help you with your zinc and aluminum alloy product needs. You can request a quote here.