Gravity Casting Alloys

Eastern Alloys manufactures all zinc alloys used in the gravity casting industry.  Gravity casting processes use gravity to pour and feed molten metal into a mold.  The process is slower than die casting, and use lower cost tooling materials like sand, and graphite (unique to zinc alloys), but perfect for lower volume requirements of up to 20k parts per year.  Special zinc alloys are used for this process which generally have a longer solidifcation range which allows sufficient time for gravity to feed the mold.

The Zinc/Aluminum alloy family (ZA alloys) have up to 27% aluminum which increases the solidification range of the alloys allowing for a longer solidification time and metal pouring/feeding to occur, and improves the casting's mechanical properties.  The Slushcast and Kirksite alloys are used for other unique products as described below.

Recommended Downloads:

Zinc Gravity Casting Alloys:

Each Zinc alloy has specific benefits which are described below.  To learn more about each individual alloy, please click on the zinc die casting alloy of interest, review the recommended downloads (above), or click here for an advanced search by property.

per page


A moderate strength zinc-based alloy developed primarily as a forming tool alloy.

Slush Cast Alloy

Zinc based alloy used to form "hollow" decorative castings that are not subjected to high stress conditions.

ZA-8 Permanent Mold

Zinc/Aluminum alloy with 8% aluminum. ZA-8 can be both gravity cast and die cast. The lower aluminum content allows this alloy to be easily electro-plated.

ZA-12 Permanent Mold

ZA-12 is a zinc based casting alloy that can be both gravity cast and die cast. It is the most common gravity casting alloy with the best combination of properties and casting ability.

ZA-27 Sand Cast

Zinc/Aluminum alloy with 27% aluminum. ZA-27 can be both gravity cast and die cast, and is the strongest of the ZA alloys.