Differentiate between permanent mold and expendable mold casting processes
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Expendable molds are made of sand, plaster, and ceramics capable to withstand high temperatures. Permanent molds are made of metals that keep their strength at high temperatures
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Sectional steel cores are sometimes used. The basic difference between permanent mold and die-casting is that permanent mold is a gravity feed process whereas die-casting uses pressurized injection. Gravity feed yields a denser casting.
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