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Obbo Zirconia Ceramic Foam Filter for Molten Steel Iron Metal Filtration. Efficient Impurity Removal: Filters slag and refractory fragments to micron level, improving casting surface hardness and strength. Stable Metal Flow Control: 3D mesh structure reduces turbulence and secondary oxidation, ensuring uniform casting structure. Cost & Time Saving: Reduces machining allowance and cleaning time, significantly improving delivery efficiency. Customizable Sizes & Shapes: Size and shape can be made according to customer requirements for specific gating systems. Proven Manufacturer: Factory direct price with over 14 years of manufacturing experience in ceramic filters.