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Reference.org
Flask (metal casting)
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<p>A flask is a type of <a href="/facts/Machine_tooling/XPHaqz0p">tooling</a> used to contain a <a href="/facts/Mold_(manufacturing)/1GkAeyCx">mold</a> in <a href="/facts/Metal_casting/7mMSBWTs">metal casting</a>. A flask has only sides, and no top or bottom, and forms a frame around the mold, which is typically made of <a href="/facts/Molding_sand/nFpG2bYd">molding sand</a>. The shape of a flask may be square, rectangular, round or any convenient shape. A flask can have any size so long as it is larger than the <a href="/facts/Pattern/mzD7uLQa">pattern</a> being used to make the sand mold. Flasks are commonly made of <a href="/facts/Steel/aN6qWo4H">steel</a>, <a href="/facts/Aluminum/7wmR8jYE">aluminum</a> or even wood. A simple flask has two parts: <a href="/facts/Cope_and_drag/GNPPbN6L">the cope and the drag</a>. More elaborate flasks may have three or even four parts. </p>