a solvent based plastics recycling process directly reduces large volumes of post consumer plastic waste materials by up to 500 % by volume . minimal sorting and no cleaning is required , and large percentages of contaminants are tolerated . the process yields a highly adhesive resin which cures to a hard wood or masonry type material . the reduced end product , an epoxy sludge , may be formed to provide a lumber or brick substitute . large percentages of shredded paper and other waste materials , including metals , may be added to the plastic waste materials , if desired .