A condition in a casting that occurs when gas is trapped in molten metal or as a result of mold gasses that evolved when the casting was poured.

The channel(s) that allow the molten metal to enter the mold cavity.

Moist sand that is bonded by a mixture that contains silica, bentonite clay, carbonaceous material, and water.

The weight of the casting which includes the actual product plus the metal in the gating and riser system as poured.