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Mold Properties and Characteristics

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• Strength - to maintain shape and resist erosion 

• Permeability - to allow hot air and gases to pass through voids in sand

• Thermal stability - to resist cracking on contact with molten meta

l• Collapsibility - ability to give way and allow casting to shrink without cracking the casting

• Reusability - can sand from broken mold be reused to make other molds.

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