biologic sponge,polyurethane foam materials . foam sheet, block or other any shapes . Reticulated, open cell(10ppi--70ppi) biologic sponge , polyurethane foam materials .Reticulated foam, widely used for water treatment , aquarium , cooling tower and so on ....We manufacture foam sheet, block and other any shapes .Open cell, the pore size from fine to coarse . biologic sponge