... or as customers’ requirement.5Surface treatmentUntreated, Hot dip galvanized, Cold dip galvanized, Painted, Powder coated, or as customers’ requirement. ... be actually made from copper, aluminum and other materials. However, galvanized steel grating is the widely used for its ... more than twice of cast iron products. Hot-dip galvanized treatment: Good rust-proof property, maintenance-free replacement. ...