... of thermal shock, high mechanical strength. 2.Pore density PPI:10-40 SIC Ceramic Foam filters are just developed as a ... provide laminar flow, and then the filtered metal is significantly cleaner. Cleaner metal results in higher-quality castings, less scrap, and fewer ... ; sizes ranging from 10mm up to 600mm, and thicknesses from 10-50mm. The most common porosities are 10ppi, 15ppi, 20ppi, 25ppi ...