Plasticizers, acting as swelling agents, increase the plasticity of a body. These additives absorb a portion of the available preparation water and increase the workability of the body, thanks to their swelling ability. This makes it possible to substitute plastic clay components by non-plastic materials. Plasticizers are used in pressing and ramming mixes as well as in extruded bodies. On account of extrusion body surfaces being dull in many cases, it is recommended to combine plasticizers with pressing agents and lubricants.