... materials of plastic, metal, and ceramic, including Pall ring, Tellerette packing, VSP packing ring, rasching ... pall ringa. Materialstainless steel, carbonsteel aluminum, bronze, 304L, 316L, and other alloy.carbon seep aluminium, strengthen polypropylene, ... pall ringa. Materialstainless steel, carbonsteel aluminum, bronze, 304L, 316L, and other alloy.carbon seep aluminium, strengthen polypropylene, ...