(1) Plastic random packing There are many different types of plastic tower packing including Pall rings, intalox saddle rings, different saddle rings, step rings, Haier rings, conjugate rings, flat rings, rosettes, hollow floating balls, polyhedral balls, net cage balls and covering balls. (2) Ceramic random packing Including Raschig ring, cross diaphragm ring, Pall ring, intalox saddle ring, ceramic saddle packing, different saddle ring, step ring, conjugate ring, and combination ring. (3) Metal random packing Thanks to the thin processing wall, large void ratio, large flux, low resistance, heat resistance, corrosion resistance, and high separation efficiency of metal random packing materials, it is especially suitable for vacuum distillation towers. Metal structured packing is heat sensitive, easy to decompose, easy to polymerize, and easy to process, so it is widely used in packing towers in petrochemical, fertilizer, environmental protection and other industries.