This part of GB l0335 stipulates the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation, storage and other requirements of coated white cardboard. This part applies to the coated white cardboard made of base paper whose top and bottom layers are mainly bleached wood pulp, with mechanical wood pulp added in the middle layer, coated on one or both sides, and then calendered. This product is mainly used for printing art prints or making packaging cartons for high-end goods after printing.