Extrusion is a process whereby billets from Remelt are squeezed under high pressure, from a closed container through a shaper formed (called a die) to produce long straight semi-finished metal products such as bars, solid and hollow sections, tubes, wire and strips. Both aluminium billets and dies are pre-heated to required temperatures before extrusion.

The extruded products are subjected to further processes of straightening, cutting to required lengths and heat treatment (called ageing) to obtain required strength.

The forming tools called extrusion dies are made in the DIESHOP. This is one of the most important supporting functions of the Extrusion process.