The pattern is coated with a water-based refractory slurry, dried, and placed in a flask. The flask.

The pattern
is coated with a water-based refractory slurry, dried, and placed in a flask.
The flask is then filled with loose, fine sand, which surrounds and supports
the pattern and may be dried or mixed with bonding agents to give it additional
strength.

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The pattern is coated with a water-based refractory slurry, dried, and placed in a flask. The flask.
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