Metal filler materials include carbon steel, aluminum and stainless steel. Because of its thin wall, porosity, flux, resistance, separation is good, especially for vacuum distillation, process heat-sensitive, easy polymerization, easy to knot the carbon materials. Random packing a conjugate ring, eighty-four inner arc ring, flat ring, Raschig ring, ladder ring, Pall ring, saddle ring, double ring arc. A circular corrugated structured packing, wire-shaped corrugated, corrugated, rolled corrugated plate and so on.