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Direct extrusion is the most common extrusion process. In direct extrusion, the material, usually billet that has been heated to plasticity, is forced through a stationary die by a ram, usually powered by a hydraulic press. Indirect extrusion is an extrusion process in which the material to be extruded, usually billet that has been heated to plasticity, it held stationary while a forming die fixed in a hollow ram, usually powered by a hydraulic press, is moved through it.