A method of forming a composite extrusion is disclosed wherein a main body portion (1) of the extrusion is first extruded from a thermosetting material, this body portion then being heated so as at least partly to cure it, the main body portion then being passed at high temperature through a further...http://www.google.es/patents/US5411785?utm_source=gb-gplus-sharePatente US5411785 - Manufacture of composite extrusions
