Die Cast Zinc Alloy Properties

Die Cast Zinc Alloy Properties

Zinc’s high strength and hardness lends itself to many solutions and it’s the ideal alternative to machined, pressed, stamped, welded, and fabricated components. Zinc alloys are the easiest for die casting.  

  

Zinc alloys are ductile and provide high impact strength making these alloys suitable for a wide range of products. Zinc die casting allows for intricate details, thin walls, and excellent surface smoothness making preparation for plating and painting relatively easy.  

Properties of Zinc Alloys

See our Zinc Alloy Page for additional information and to download our Zinc Alloys property guide.

Zamak No. 3 (Alloy 3, ZP3, ZL3, ZP0400, ZnAl4, ZDC2)

The most widely used zinc alloy in North America is commonly called No. 3. About 85% of U.S. die-castings utilize Alloy 3 for its superior physical and mechanical properties, outstanding cast-ability, and long-term dimensional stability.

 

This material has earned its popularity due to its exceptional all-around characteristics. In most design applications using a zinc alloy, Zamak 3 will do the job. In general, only after casting design improvements have been evaluated and found inadequate should another alloy be considered.

 

Zamak No. 5 (Alloy 5, ZP5, ZL5, ZP0410, ZnAl4Cu1, ZDC1)

Zamak 5 has more copper resulting in increased tensile strength (about 15%) and higher hardness at the expense of elongation and impact strength. No. 5 alloy is widely used in Europe, but accounts for less than 10% of U.S. consumption.

 

Zamak No. 7 (Alloy 7, ZL7)

The third most popular alloy is a high purity, low magnesium alloy called No. 7. This alloy has improved fluidity (because of the lower magnesium content) allowing it to be cast at lower temperatures for better as-cast surface finish and higher production rates. Most No. 7 alloy is used in decorative hardware applications. Since it possesses slightly more ductility than other zinc alloys, No. 7 is also used where castings require severe deformation in assembly operations.

 

Zamak No. 2 (Alloy 2, ZP2, ZL2, ZP0430, ZnAl4Cu3, Kirksite)

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

 

The principle disadvantages of this interesting alloy are its very low impact strength and elongation after aging (especially at higher temperatures) and a slight dimensional instability with aging.

 

ZA-8 (ZP8)

Offers best plating and finishing characteristics with improved strength, hardness and creep properties compared to the other conventional zinc ZAMAK die casting alloys. Major application area is usually for die casting where improved properties over ZAMAK’s are required, particularly performance at elevated temperatures.

 

EZAC™ (Developed and trademark of Eastern Alloys)

This is the most recent development in commercially available zinc die casting alloys. Research has shown EZAC™ to be the most creep resistant of all the zinc die casting alloys with over an order of magnitude improvement over ZAMAK 5 and ZA-8. This is also a very strong alloy with a yield strength (57 ksi) and hardness (102-134 brinell) comparable to ZA-27.

 

Due to its low melting temperature, EZAC™ can be cast in a hot chamber die casting machine and does not exhibit the same wear and tear as shown with ACuZinc®5.

 

Zinc alloys offer versatility and cost-effectiveness as die casting metals, presenting numerous advantages for a wide range of applications. If you are seeking a reliable and experienced zinc die casting manufacturer, reach out to us today to obtain a quote for your project.

Dave Magner

Dave Magner

Dave Magner is the Director of Sales and Marketing and has been with Deco Products since 2015. He has a +20 years of engineering experience in mechanical and electrical testing and design and zinc die casting, plastic injection molding, stamping, assembly, and automation processes.

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