... packing in different materials of plastic, metal, and ceramic, including Pall ring, Tellerette packing, VSP packing ring ... , carbonsteel aluminum, bronze, 304L, 316L, and other alloy.carbon seep aluminium, strengthen polypropylene, strengthen nylon6, strengthen ... , carbonsteel aluminum, bronze, 304L, 316L, and other alloy.carbon seep aluminium, strengthen polypropylene, strengthen nylon6, strengthen ...