What to know about Zinc Alloys for Casting

Zinc alloys have been a popular option for the casting process for many years. This is due to their low melting point, good corrosion resistance and ability to create complex shapes. Deco Products often uses these alloys used for producing items such as door hardware, locks, and structural components. In this article, we will delve into the details of zinc alloys for casting.

Properties of Zinc Alloys

Zinc alloys are comprised of zinc as the primary element, along with other metals like aluminum, magnesium, and copper. These alloys have a low melting point which is advantageous for casting and working with the material. Additionally, they offer good corrosion resistance which makes them suitable for outdoor applications.

Common Types of Zinc Alloys

ZAMAK is a family of zinc-based alloys that contain aluminum, magnesium, and copper, known for their strength and durability.

Zamak No. 3

Zamak No. 3, is the most widely used zinc alloy. No. 3 is the choice for about 85% of U.S. die-castings, due to its excellent cast-ability and long-term dimensional stability. Its superb all-around physical and mechanical properties, No. 3 will do the job in most design applications using a zinc alloy.

Zamak No. 5

Widely used in Europe, No. 5 alloy accounts for less than 10% of U.S. consumption. The addition of about 1% copper to the No. 3 alloy provides increased tensile strength and higher hardness.

Zamak No. 2

Zamack No. 2, Actually, is a predecessor of the universal No. 3 alloy. No. 2 offers the highest strength and hardness available in a conventional zinc alloy. It is about 25% stronger as cast than No. 3 and 10% stronger than No. 5 with higher hardness than both.


Another common type of zinc alloy is ZA-8. This is a zinc-aluminum alloy that is stronger and more heat-resistant than other zinc alloys. It is often used in the automotive industry to make engine parts, transmission parts, and other components. The alloy is also commonly used in the production of items that will be subject to high stress and repeated use.

Die Casting Process

Due to the low melting point, zinc alloys are most commonly used in the die casting process. This is a process where molten zinc alloy is injected into a mold under high pressure. The mold, also known as a die, is made of steel and is designed to give the final product its desired shape.

Die casting is a fast and efficient way to produce large quantities of parts with precise dimensions and good surface finish. It is also a cost-effective method, as the molds can be used multiple times.

Advantages of Zinc Alloys for Casting

Zinc alloys have several advantages when it comes to casting. Their low melting point makes them easy to work with, and they are also corrosion-resistant, making them suitable for outdoor use. Additionally, they can be used to make complex shapes, making them a versatile material for a wide range of products.


In conclusion, zinc alloys are a popular choice for casting due to their low melting point, good corrosion resistance, and ability to form complex shapes. Some common types of zinc alloys include ZAMAK and ZA-8. They are mainly used in die casting process. Zinc alloys are also versatile and cost-effective, making them a great choice for a wide range of products.

Zinc Alloys

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