Alumina foam ceramic filter is mainly used in the purification process of aluminum and aluminum alloy production. It can effectively remove all kinds of inclusions with micron fineness in aluminum water, and make aluminum water into a smooth laminar flow, which is conducive to punching. Excellent aluminum water scouring resistance, strictly controlled hole size and through-hole ratio, can obtain stable filtration; Thus improve casting quality, reduce casting reject rate, prolong service life, reduce casting cost. Large size alumina foam ceramic sheet (filter plate) application of aluminum alloy casting rod, flat ingot, aluminum foil, aluminum cans and aluminum profiles and other aluminum melt casting workshop, 15 to 20 micron impurity particles filter rate of 98.3%, can help obtain aluminum products. Can be produced according to customer requirements, mesh 10PPI to 60PPI selection range, size up to 23 inches.