Foam ceramics filter, with a history dating back to the 19th century, have evolved dramatically since the 1960s, when the organic foam impregnation method revolutionized their production. Boasting an ultra-high porosity of 80-90%—far exceeding the 30-50% of traditional porous ceramics—they offer superior performance in filtration and beyond, thanks to their foam-like, interconnected pore structures.

Global advancements have been notable. Leading manufacturers like U.S.-based Astro and Selee have mastered large-scale, automated production, using microwave drying and computer-monitored kilns. Their products excel in filtering molten metals: from aluminum and copper alloys (using cordierite/alumina blends) to high-temperature steels (with SiC-based filters), enhancing casting quality across industries.

In recent decades, applications have expanded. Foam ceramics serve as catalyst carriers in automotive exhaust systems, aid in waste heat recovery, and purify water/air—proving invaluable in environmental and energy sectors.

While China began researching porous ceramics later, progress is evident, with commercialized products now contributing to automotive and machinery manufacturing. As technology advances, foam ceramics continue to emerge as a key material, driving efficiency and sustainability across global industries.