In this type of casting, mould is prepared around an expandable pattern, and a single gating system is used to make a large number of casting. The pattern used to make mold is get destroyed or it completely lost its shape during investment casting. The common pattern material for precision investment casting wax, so this process is also known as lost-wax casting. The other important pattern materials used in investment casting are plastic, wood, and mercury. When mercury is used to make a pattern then the process is known as mercast.http://www.disoncasting.com/marine-hardware/
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