Molding Sand: Types and Properties [PDF]
Parting sand is used to make the parting mold. In general cases, the patter is removed from the mold. Then the mold used to stick. So, parting sand is used as the mold does not stick. Before attaching the mold with the pattern, such parting sand is used to sprinkle on the mold as after removing the pattern the mold does not stick. In the drag, cope surface and cheek, parting .