Dry sand is combined with a liquid resin. A chemical hardener is then added and the resulting mixture compacted around a pattern and left to set. When the sand mold halves are pulled apart, the pattern removed, and the mold brought together again, molten metal is poured into the mold cavity.

The air-set (no bake) process can handle larger and more complex parts than with the green sand molding process.

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Green Sand Molding

Lost Foam Casting (Expendable Pattern Casting)