It is a range of materials that are specially designed to use in distillation and absorption columns, as well as chemical reactors. They usually consist of thin corrugated metal plates or gauzes, designed to force fluids on complicated paths throughout the column.
Random packing uses a random distribution of small packing materials to assist in the separation process, while structured packing uses larger, fixed packing structures.
It is made from a variety of materials including corrugated sheets of perforated embossed metal, plastic, or wire gauze. The resulting product is an open honeycomb with inclined flow channels producing a high surface area coupled with a low gas flow resistance.
It is manufactured in a wide range of sizes by varying the crimp altitude. Packing surface ranges from 50 m²/m³ (lowest efficiency, highest capacity) to 750 m²/m³ (highest efficiency, lowest capacity).