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Important factors in selecting sand for molds

Mold Material ` The mold material is the one out of which the mold is made. ` The mold material should be such that casting should be able to retain its shape till the molten metal has solidified. Types of molds: ` Permanent molds: They are made up of ferrous metals and alloys (Steel, Grey CI, etc.). ` Temporary refractory molds: They are made of refractory sands and resins

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