Abstract: To minimize the amount of setting gas to be gasified and to be introduced into a molding sand containing a gas-settable binder, a metered volume of the setting liquid is injected directly into a gassing plate arranged in front of an opening leading to a cavity containing the molding sand. Heat energy is supplied to the gassing plate to effect gasification of the liquid. A superpure gas then is produced and is directed through the molding sand. Consequently, not only is only a small amount of setting liquid required to set the molding sand but only a small amount of compressed air or other non-reactive gas is required for scrubbing to remove the residual superpure gas from the sand. Therefore, cleaning or removal of the gas from the set molding sand can be performed at a low cost.