Patent ID: 8656982

Claim:
A method for producing a cast article, comprising the steps of: providing a heat-resistant filter and a pair of structures to form a filter holder; assembling a part for removing impurities from a molten metal by disposing the heat-resistant filter between the structures to form the filter holder, so that the part comprises the filter holder and the heat-resistant filter, the filter holder being constituted of a structure comprising an organic fiber, an inorganic fiber and a thermosetting resin; burying the part in a molding sand so that the part is joined between runner tubes, which are components from the part, to form a runner system of a mold where impurities from a molten metal are removed; and pouring the molten metal through the part into the mold so as to cast the molten metal, wherein the amount of molten metal to be poured is 300 kg to 5000 kg, based on a cast article weight, per filter, and the temperature of the molten metal is not lower than 1350° C. and not higher than 1600° C.; wherein a flow rate of molten metal is from 10 kg/sec to 150 kg/sec, per filter.