... materials of plastic, metal, and ceramic, including Pall ring, Tellerette packing, VSP packing ring, rasching ring ... , Ladder ring, Wire gauze packing,1.Metal pall ringa. Materialstainless steel, carbonsteel aluminum, bronze, 304L, ... plant, separation of ethylbenzene separartion of isooctane/mehylbenzene2. Plastic pall ringa. Materialstainless steel, carbonsteel aluminum, bronze, 304L, ...