To this end cryogenic processing (subjection the components to very low temperatures, followed by shredding in a hammer mill) has been used to separate ferrous metals from non-ferrous metals. At very low temperatures the differences in ductility of metals becomes increased such that with liquid nitrogen (-196◦C) treatment ferrous metals fragment to a greater extent that non-ferrous metals which can be separated on subsequent screening. One technique developed is to press the composite component into the form of a bale which is then subjected to a liquid nitrogen spray followed by crushing in a hammer mill and screening to separate the ferrous metals from the non-ferrous metals.