Overview
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.
In the slush casting process, metal is poured into a slush-casting mold, allowed
time to solidify along the mold wall only, and then poured out. The resulting
"hollow" casting is then ejected and cooled. Its primary use is for decorative
castings not subjected to high stress conditions, such as lamp bases.
Properties
| Ultimate Tensile Strength |
25,000 psi (chill cast) |
| Elongation |
1% |
| Impact Strength |
1 ft-lb |
| Melting Range |
716-743°F |
| Density |
0.24 lb/cu in |
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Comments
Because of the low melting temperatures and excellent fluidity, the alloy should
be cast at temperatures not to exceed 825°F. Since the alloy is normally melted
and held in cast iron kettles, high temperatures will cause excessive iron
pickup, resulting in poor castability and poor finishing characteristics.
Since the alloy contains no Magnesium (to ensure high fluidity) extreme care
must be taken to prevent contamination by Pb (lead), Sn (tin) or Cd (cadmium)
which can cause subsequent inter-granular corrosion. Castings are normally
plated soon after finishing to preclude any oxidation or corrosion problems.
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Eastern Alloys, Inc. is a member of the London Metal
Exchange, or LME, ILZRO, Interzinc, NADCA, and DDC.