Zirconia foam ceramic filter is made of high quality and high purity zirconia. It is made of unique formula and advanced environmental protection technology. The three-dimensional network structure is uniform, with high strength, stable texture, no slag, high temperature resistance and thermal shock resistance. Strong and excellent performance. Suitable for purification and filtration of stainless steel, carbon steel and cast copper parts below 1700 °C and other high temperature alloy solutions. It can filter non-metallic slag and slag as small as micron to make the surface of steel casting smoother and reduce machining loss. The filter can make the molten steel more evenly fill the cavity, and the molten metal has higher turbulence during pouring.