Gravity casting is a process which uses the Earth’s gravity to fill a mold by pouring molten aluminum or zinc alloy into it.  The tooling investment is relatively economical when compared to die casting. 

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• Zinc alloy gravity-casting can be used for general industrial applications where strength, hardness and wear-resistance are required.
• Gravity-casting is economical for small quantities and lead times are relatively short.
• Gravity-casting offers a very reasonable production cost.
• Zinc alloy casting parts are often used to replace cast iron because of their similar properties and higher machinability ratings. The mechanical properties of zinc alloys make them attractive substitutes for cast iron and copper alloys in many structural and pressure-tight applications.
• The majority of zinc alloys are virtually pollution free. No fluxing or degassing is required, and because of the low casting temperatures, minimal pollution from the sand mold results.
• Other applications in which zinc alloys have been successfully used as a substitute include, bearing bushings and flanges.
  (Courtesy of eFunda.com)