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Because the solid form of the metal is unable to hold as much gas as the liquid form of the metal, bubbles will form during the cooling and solidification stages of the casting process. When these bubbles are present, the surface of a casting will have round, circular cavities or holes in it, which will be visible when the casting is removed from the mold. A gas porosity-containing casting is one of three types of zinc die casting defects that should be considered when designing a casting that contains gas porosity: The first ty... more