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Diecasting Alloys
Eastern Alloys manufactures the complete range of ZAMAK alloys
developed for the die casting process. ZAMAK alloys were first developed during
the 1920's by The New Jersey Zinc Company. The name ZAMAK draws upon the basic
metallurgy of the alloy group: Z-Zinc, A-Aluminum, MA-Magnesium, and K-Kopper
(e.g., German). In the United States, ZAMAK 3 is the most common alloy for hot
chamber die casting. With a combination of superior mechanical properties and
low melting/manufacturing costs, it fulfills the needs for most die casting
applications. Other ZAMAK alloys include ZAMAK 2, ZAMAK 5, and ZAMAK 7. Common
to each alloy is a consistent Aluminum content range, however, the alloys
differ in specification by varying amounts of copper, magnesium, and nickel -
resulting in different mechanical and physical properties.
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Gravity Casting Alloys
ZA alloys were initially developed for gravity casting. Their mechanical
properties compete directly with bronze, cast iron and aluminum using sand,
permanent mold and plaster mold casting methods. Beginning in the late 1950's
and continuing into the 1970's, Noranda, New Jersey Zinc Co. Ltd., St. Joe
Mineral Co. and ILZRO contributed to development of the ZA alloy group. Zinc
and Aluminum are the major alloy constituents, along with other minor additions
of magnesium and copper. The numbers associated with the name represent the
amount of aluminum in the alloy (i.e. ZA8 has 8% aluminum). Distinguishing
features of ZA alloys include high as-cast strength, excellent bearing
properties, as well as low energy (melting) requirements.
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Slush Casting Alloys
Slush-cast alloy is a high-purity purpose-engineered product manufactured by
Eastern Alloys. This alloy was developed to provide a high fluidity casting
material capable of producing a good surface definition when cast in metal
permanent molds or rubber molds. It contains approximately 5% aluminum and 95%
zinc giving it a very short freezing range, and good fluidity.
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Steel Coating Alloys
Eastern Alloys manufactures a comprehensive line of purpose developed EAZALL™
steel coating alloys providing optimal corrosion-protection for steel strip,
shapes, and tubing and wire products. EAZALL™ brand alloys meet the needs of
the largest continuous steel strip and sheet-coating mills to after-fabrication
hot dip galvanizers to high-speed tubing and wire coaters. New technology
allows steel products to effectively compete for new structural and
architectural applications, many of which depend upon zinc coatings as an
economical means of corrosion protection. Much of this growth is a result of
new zinc coating alloys such as Galvalume™ and Galfan™ designed for specific
properties and performance.
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Mold Base Alloys
Eastern Alloys manufactures mold-base alloys, also known as Kirksite alloys.
Kirksite is a moderate strength zinc-base alloy that was developed primarily as
a forming tool alloy. Dies cast from Kirksite provide low-cost tooling because
the alloy can be accurately cast, requiring a minimum of finishing. In
addition, Kirksite has been used as a general purpose casting alloy for
non-stressed components.
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